Manual JBL Gts 100

GT

S1

00

GTS100 2/1 CHANNEL AUTOMOTIVE POWER AMPLIFIEROWNER’S MANUAL

JBL 1394 Manual 7/17/98 11:49 AM Page 1

Table Of Contents

Introduction ..................................................................................................3

Features.......................................................................................................4

About Installation .........................................................................................4

Quick Start ...................................................................................................5

System Design Using the GTS100 ..............................................................6

Typical Applications .....................................................................................7

Installation Precautions................................................................................9

Physical Installation .....................................................................................9

Controls and Connectors ...........................................................................10

Mounting Instructions.................................................................................12

Wiring.........................................................................................................12

Power Supply Connections........................................................................14

Audio Input Connections............................................................................15

Speaker Connections ................................................................................17

Operation ...................................................................................................20

Solving Noise Problems.............................................................................21

Maintenance ..............................................................................................24

Additional System Configurations for Add-On or Upgrade ........................24

In Case of Difficulty ....................................................................................27

Specifications.............................................................................................29

Owner’s Warranty Information Records

Model Number

Serial Number

Dealer Name

City, State, Zip

Sales Receipt Number

Date of Purchase


Introduction

Thanks for purchasing your new GT series automotive amplifier. The GT series amplifier you have chosenincludes many unique features toenhance its performance and utility.The power amplifier circuitry is a fully discrete design notable for low distortion and unusually clean and clearreproduction quality. Your GT seriesamplifier will easily connect to virtuallyany car audio system, whether it is factory installed or purchased separately.

In addition to conventional preamp-levelinputs, this model features JBL’sUniversal Interface design, which facili-tates simple connection to factoryradios with the low distortion that is usu-ally only associated with preamp levelconnection. With Universal Interface, afactory radio can be used either as themain music source or combined with aCD changer which includes volumecontrol capability, simultaneously connected directly to the amplifier.

3

By providing this two-unit direct connec-tion, Universal Interface circuitry elimi-nates the need for an FM modulator toconnect a CD player to factory radios,improving the fidelity of digital playback.

Also, when using a high-powered (BTL)radio through the speaker-level inputs,Common Sense turn-on circuitry senses the common-mode voltage present on the radio’s speaker wiresand turns the amplifier on without anadditional “remote” wire. When thespeaker-level inputs are used exclu-sively, the preamp-level inputs may beconverted to preamp-level outputs todrive additional amplifiers or signalprocessors.

In addition, the built-in active crossoverprovides either high-pass or low-passoperation. This lets your GT seriesamplifier power either subwoofer ormain speakers in a bi-amplified system,without the expense of an additionalcrossover.


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Features

• Bridgeable 2/1 Channel Operation

• Simultaneous Stereo + MonoOperation

• Built-in Staggered 18dB/Octave100Hz High-Pass and 80Hz Low-PassCrossover

• No Current Limiting

• Oversized Floating Rail MOSFETSwitch-Mode Power Supply

• Common Sense 2-way Turn-On

• Stealth Remote Silent Turn-OnCircuitry with Power-On Indicator

• Continuously Adjustable Gain Controls

• Capable of Single-Ended OperationInto 2-Ohm Loads.

• Fully Complementary, Direct-Coupled,Discrete Power Amplifier Circuitry

• Gold Plated RCA Input Connectors

• Preamp Output Capability

• Convenient Easy-Disconnect Powerand Speaker Connections

• Third Order (18dB per Octave),Capacitive/Inductive Power-Supply Filtering

• Input Mode Switching

• Made in USA

About Installation

Although the GTS100 was designed tomake installation as easy as possible, itis a sophisticated product that requiresproper installation to realize its full per-formance potential. Skill with tools, anunderstanding of basic electronics, andexperience with car stereo installationare needed to properly install theseamplifiers. If you feel you do not havethe necessary knowledge and skills, westrongly recommend that the instal-lation be done by your authorizedJBL dealer. If the GTS100 is installedby a qualified JBL dealer, we will doublethe length of your warranty to two yearsfrom date of purchase.

If you choose to install the GTS100yourself read all of the information inthis manual before you start the installa-tion. Pay particular attention to the safety precautions and notes.

It will save potential problems later ifyou take a few minutes to plan the com-plete installation before you start. Therouting of wires, the power supply con-nection points, and the mechanicalinstallation of the unit should be com-pletely thought out before you begin.Work carefully and check each step asit is performed. Before operating theamplifier, recheck the entire installationto be sure that each connection is cor-rect, properly insulated and secure.


5

5. Connect the outputs from the signalsource to the appropriate inputs ofthe amplifier according to the WiringDiagram (page 13) with either highquality low-level signal cables withRCA plugs, with the suppliedSpeaker-level input connector, orboth.

6. Connect the speakers to the ampli-fier according to the wiring diagramon page 13.

7. Turn the input sensitivity adjustmentto the 1/4 position.

8. Set the input level switch to “line” if you are using the line-level (preamp) inputs.

9. Set the crossover switch as desired.

10. Set the input mode switch to stereo, left + right or right input only operation.

11. Reconnect the negative batterycable.

12. Turn on the signal source at a lowvolume level and check for the correct output from each speaker.

13. Adjust the amplifier gain control,using the procedure described inthe Gain Adjustment section onpage 20.

14. Read the rest of the manual to getmaximum use and enjoyment fromyour amplifier.

Quick Start

Recommended for experienced professional installers only!

1. Disconnect the negative cable from the battery. Note: If the vehicle’sradio features a code type securitysystem, make certain you know thecode before disconnecting the battery!

2. Mount the amplifier to the desiredlocation using four screws.

3. Run a minimum AWG #10 powercable complete with a 20 amp fuse(not included) directly from the posi-tive +12V battery terminal to thedesired amplifier location. Keep the fuse to within 5" of the batteryterminal, and before the wire runsthrough any metal partition.

Note: All wiring connections should bemade either by soldering with heat-shrink tubing insulation or with highquality crimp type insulated connectorsinstalled with a good crimping tool.Soldering crimp connections is recom-mended to further enhance connectionreliability. Never use wire-nuts, insula-tion-displacement connectors (i.e.ScotchLok type), or “twist and tape”connections. Do not use electrical tape;it will loosen with age and extreme temperatures. Never leave bare wireexposed.

4. Connect power wiring as shown inthe Wiring Diagram on page 13,using the supplied power harness.


System Design Using theGTS100

SpeakersWhen used in the non-bridged mode,the GTS100 can easily drive 2 ohmspeaker loads. When only one speakeris connected to each channel, virtuallyany common speaker may be used.When two speakers are connected inparallel to a given channel, each speakermust have a minimum impedance of atleast 4 ohms to ensure that the com-bined load does not drop below 2 ohms.Although the amplifier will not be dam-aged, load impedances lower than 2ohms will eventually cause the amplifierto overheat, activating the protectioncircuits and causing the unit to shut offuntil it cools down sufficiently.

6

(+)

(-)

(+)

(-)

Parallel Wiring

Series Wiring

2 OhmsNominalImpedance

8 OhmsNominalImpedance

4 Ohms

4 Ohms

4 Ohms 4 Ohms

When the GTS100 is in bridged mode,the combined impedance of the speaker(or speakers) connected to the bridgedchannel should be at least 4 ohms. Asin the example above, sustained opera-tion of the GTS100 in bridged modewith less than 4-ohms will likely causeoverheating. If monaural operation isdesired, and two 4-ohm speakers areused, it is best to connect each speakerto an individual amplifier channel anduse the “L+R” mode on the input-modeswitch to provide monaural operation.

The GTS100 must not be used withspeakers that have either one of theirinput terminals wired to the frame ofthe speaker or to the chassis of thevehicle.

Signal SourcesThe low level preamp outputs of anyradio/tape deck, CD player or preamp/equalizer so equipped can drive theGTS100. The Gain control of theGTS100 is used to match the amplifierto the output voltage of the source. This matching is important to keepnoise low and is explained in the GainAdjustments section of this manual(page 20).

Thanks to Universal Interface circuitry,the GTS100 can also be connected topower amplifiers, radios or equalizersthat are equipped with only speakeroutputs by connecting them through thespeaker level input connector. Insidethe GTS100, the speaker-level and preamp-level inputs are connectedthrough a mixing circuit, which allowsthem to be used simultaneously.Therefore a low level source, such as a CD player equipped with preamp


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controls (Volume, Balance, Bass,Treble) may be connected to the pre-amp-level inputs at the same time as apowered radio/tape unit is connected tothe speaker-level inputs. This providesa higher performance alternative to anFM Modulator connection when youwish to add CD capability to a factoryinstalled cassette radio. Switching fromone source to the other is as simple asturning the desired source on and turn-ing the undesired one off — no addi-tional switches or relay connections are needed.

Typical Applications

Other ComponentsThe system options of the GTS100 are numerous. All JBL amplifiers aredesigned with sufficient adjustmentrange to match with the accepted “nor-mal” voltages and impedances used byvirtually all car audio components. Withvery few exceptions, the GTS100 willmatch correctly to any equipment youalready have.

2 or 4-Ohm Full-Range Speakers or Subwoofers

L– L+

– +

R– R+

– +

GTS100

GTS100

Application 1Stereo Full-Range or Subwoofer Operation

Full-Range Operation

Subwoofer Operation

Crossover Input Mode Line Switch Switch Switch Off Stereo In

Crossover Input Mode Line Switch Switch Switch Low Stereo In

Main speakers are driven by head unit or additional amplifier.

Preamp orSpeaker-Level

InputL R

The following diagrams show the most common basic system configurations using theGTS100. More elaborate systems are formed by using a combination of these “buildingblocks.” For additional ideas, refer to the “Add On and Upgrade Section” near the endof this manual.


8

L– L+

– +

L– R+

– +

R– R+

– +

R– R+

– +

L– R+

– +

L– L+

– +

LR

L RR

L– R+

– +

GTS100

GTS100

4-Ohm Full-Range Speaker or Subwoofer

4-Ohm Full-Range Speaker or Subwoofer

Application 2Bridge-Mode Operation

Single Amplifier:Subwoofer-Operation (Mono)

Main speakers are driven by head unit or additional amplifier.

Preamp orSpeaker-Level

Input

L R

2 or 4-Ohm Full-Range Speakers

L R

Front Rear

4-Ohm Subwoofer

GTS100

AGTS100

B

Application 3Bi-amplified, Three-channel Subwoofer/Satellite System.

Amp Crossover Input Mode Line Switch Switch Switch A High Stereo In B Low L + R In

Stereo Subwoofers may be used by configuringGTS100-B as shown in Application #1

GTS100B

GTS100

Speaker-LevelInput L R R L

2 or 4-Ohm Full-Range Speakers

L RPreampOutput

PreampInput

4-Ohm Subwoofer

GTS100

BGTS100

A

Application 4Bi-amplified, System Using Preamp Output Capability

Stereo Subwoofers may be used by configuringGTS100-B as shown in Application #1 orby using dual GTS100s as shown in Application #2

Amp Crossover Input Mode Line Switch Switch Switch A High Stereo Out B Low L + R In

GTS100

GTS100

L– R+

– +

GTS100A

GTS100

For Single Amplifier Subwoofer Use

For Dual-Amplifier Full-Range or Subwoofer Use

Preamp or Speaker Level

CrossoverSwitch

Low

Amp

B

Input ModeSwitch

L + R

LineSwitch

In

Dual Amplifier:Subwoofer-operation (Stereo)

Full-Range Operation (Stereo)

CrossoverSwitch

Low

Amp

A + B

Input ModeSwitch

R

LineSwitch

In

CrossoverSwitch

Off

Amp

A + B

Input ModeSwitch

R

LineSwitch

In


9

Installation Precautions

Before beginning the installation of theamplifier, read the following precautionscarefully. Failure to heed these warn-ings could result in personal injury ordamage to property .

• The GTS 100 should be installedonly in vehicles that have 12-voltnegative ground electrical systems.Connection to other types of electri-cal systems may damage the ampli-fier and/or the vehicle’s electrical system.

• Before beginning the installation, dis-connect the negative (ground) cablefrom the vehicle’s battery. This willprevent accidental short circuits whileworking on the installation. Reconnectthe cable only after the installation iscomplete and the wiring has beencarefully checked to be sure thereare no exposed wires or short circuitsand everything is properly andsecurely connected. Note: If the vehi-cle’s radio features a code type secu-rity system, make certain you knowthe code before disconnecting thebattery!

• Work in an area that is well ventilated.

• Wear eye protection whenever cut-ting, drilling or filing any parts of thevehicle.

• Wear ear protection when using highspeed drills, saws, sanders, orgrinders. We want you to be able toenjoy the system once it is installed.

• Before cutting or drilling any holes inthe vehicle, inspect the area carefullyto be sure there are no electrical

wires, hydraulic brake lines, fuellines, or fuel tanks that may be dam-aged while doing so. Such compo-nents may be hidden within doublewalled panels or structural mem-bers of the vehicle, so be extremelycautious.

• Do not bypass or modify the fuse onthe chassis of the amplifier. Do notreplace the fuse with one rated forhigher current levels. Doing so couldresult in damage to the amplifier and the vehicle’s electrical system.Repeated blowing of the power supply fuse indicates a fault withinthe amplifier or problems in theinstallation.

• An additional power supply fuse (notincluded) should be located as closeas possible to the battery on the +12V wire to minimize the chance ofelectrical system damage or fire inthe event of a short circuit in thepower supply wire.

Physical Installation

There are several factors to considerwhen selecting a mounting location forthe GTS100.

• It must be solidly mounted in a placewhere it will not be subjected toexcessive shock and vibration.

• Under no circumstances should theamplifier be mounted where it will beexposed to moisture or extreme heat.

• Try to mount the amplifier where themain +12 volt power supply wire,which must be connected directly tothe battery, can be kept relativelyshort.


• The GTS100 must be mounted in aplace where air can circulate aroundthe fins on the chassis. Good air circulation around the amplifier will make it operate at lower tempera-tures and reduce the chance of thethermal protection circuits being trig-gered. The installation positions thatprovide the most efficient air circula-tion around the amplifier are shownbelow.

• Use a mounting location that allowsaccess to the wiring connections andlevel adjustments. This allows theunit to be mounted before these con-nections and adjustments are made.If the amplifier must be mounted inan inaccessible location, it may beeasier to mount it after the wiringconnections and level adjustmentsare complete.

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Controls and Connectors

1. Line Level RCA Inputs – Use theseconnectors for line (preamp) level inputto the amplifier. When speaker inputsare used, this connector can be con-verted for use as a line-level output bysetting the “Line” switch to “out.”

2. Line Selector – This switch sets theline level connectors for either input oroutput. Set switch to “In” for normal linelevel input operation.” Set the switch to“Out” to use the line level connector forline level outputs to drive other ampli-fiers or signal processors when usingthe speaker level inputs.

3. Gain Control – Use this control toadjust the input sensitivity of the ampli-fier. See the “Gain Adjustments” sectionfor tips on proper setup.

4. Input Mode Selector – This switch isused to set the input mode for both pre-amp and speaker-level inputs. Set thisswitch to Stereo for normal operationusing both left and right inputs. Set thisswitch to R to drive both the left andright channels with only a single inputon the right channel. Set this switch to“L+R” to sum the left and right inputs for a mono output on both amplifierchannels.

5. Speaker Input Connector – Use thisconnector for speaker level input sig-nals. A wire harness is supplied for this connector. See the “Audio InputConnections” section (page 15) forwiring instructions. This input alsoincludes JBL’s Common Sense inputcircuitry which turns the amplifier on assoon as a high powered head unit con-nected to this input is turned on.

AIR FLOW

BEST-Vertical Mounting

AIR FLOW

GOOD-Horizontal Mounting

NEVER-Mount Upside Down

GTS1

00


11

POWER

Power Indicator

L

R

LINE IN OUT

NOM

MIN MAXGAIN

INPUT MODE

STEREO

CROSSOVEROFF HIGHR L+R

LOW

+R-

+L-

+R-

+L-

SPEAKEROUTPUTS

SPEAKER INPUTS

BRIDGED

FUSE 20A

POWER

BAT(+) REM GND

➀ Line Level RCA Inputs

➁ Line Selector

➂ Gain Control

➃ Input Mode

➄ Speaker Input Connector

➅ Crossover Mode Selector

20A

PowerConnector

➆ Fuse

➇ Battery Ground

➈ Remote Turn-On

➉ Battery (+) In

➉ Speaker Output Connector11

6. Crossover Mode Selector – Thisswitch controls the built in crossover.Set the switch to “Off” for full bandoperation. Set this switch to “Low” toactivate the 80Hz low pass filter on theamplifier (for subwoofer use). Set theswitch to “High” to activate the 100Hzhigh pass filter for use with satellitespeakers. Note that the filter does notaffect the line level outputs on theamplifier.

7. Fuse – 20 Amp ATC type Fuse.

8., 9., 10. Power Connector –Connection for included power wire har-ness. See “Power Supply Connections”

on page 14 and the wiring diagram onpage 13 for information on wire colorcodes and proper connections.

11. Speaker Output Connector –Connection for included speaker outputharness. See “Speaker Connections”section on page 17 for information onwire color codes.

12. Power Indicator LED – Power indi-cator light glows for normal operationwhen the amplifier is activated by eitherthe remote or common sense turn-on circuits.


Mounting Instructions

Place the amplifier in the installationlocation. Use a pen or pencil to markthe four mounting screw hole locations.Set the amplifier aside and drill theholes for the mounting screws. (Note: Ifthe surface you are mounting the ampto is covered with carpeting or uphol-stery, cut a small “x” in the material ateach screw hole location before drillingthe holes. This will help prevent tearingor stretching of the material and carpetfibers from being pulled out.) Set theamplifier in position and align themounting holes with the holes previouslydrilled. Put washers on the four sheetmetal screws provided and drive theminto the mounting panel. Tighten thescrews evenly until the unit is solidlymounted.

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WiringProper wiring of the GTS100 and theassociated components is extremelyimportant for proper performance andlong term reliability. Using the propertype of wire is very important. If a spe-cific type of wire should be used for acertain application, it will be noted.

All wiring connections should be madeeither by soldering with heatshrink tub-ing insulation or with high quality crimptype insulated connectors installed witha good crimping tool. Soldering crimpconnections is recommended to furtherenhance connection reliability. Neveruse wire-nuts, insulation-displacementconnectors (i.e. ScotchLok type), or“twist and tape” connections. Do notuse electrical tape; it will loosen withage and extreme temperatures. Neverleave bare wire exposed.

Route the wiring through the car care-fully. Do not allow wires to lay againstsharp sheet metal edges or any othersurfaces that might wear away or cutthrough the insulation of the wire. Useinsulated strain reliefs, rubber grom-mets and plastic tubing to protect thewires whenever they are run throughsheet metal panels or are placed wherethey might be pulled or damaged.


13

Cassette/CD Tuner(Head Unit)

CD Playeror Changer

CD Input

Cassette/CD Preamp Output

Antenna Input

PowerAntenna

PowerAntenna

Relay

Blue w/White Stripe - Remote On/Off

YellowMain +12V

Black - Power Ground

Chassis Ground

Vehicle Battery

– +

Ignition Switch

Ant

enna

Mot

or G

roun

d

Pow

erS

uppl

y

Blu

e (B

lue/

Whi

te)

Rem

ote

On/

Off

Rem

ote

Ant

enna

Bla

ck -

Pow

er G

roun

d

Red

- M

ain

+12V

Yel

low

- B

ack

Up

Pow

er

Speakers+

–

+

Fus

e

Fus

e

Fuse

Cassette/ReceiverPower Supply

Wires

POWERG T S 1 0 0 M A D E I N T H EU S A

20 Amp(Not Included)

AmplifierPower

Connection

AmplifierSpeakerOutputConnection

AmplifierSpeaker

LevelInput

Cassette/CD Tuner Speaker Level Output Connection(Use only when line level ouputis not available)

Typical System Configuration


Power Supply Connections

The power input and remote turn-onwires are connected to the GTS100 viathe power connector on the end of theamplifier. Use the included wire harnessfor connections. In some cases, suchas a custom competition installation,you may wish to make your own custompower harness. The part number of themating connector and terminals is listedin the specifications section of the man-ual, and is a common part available atmany electronics parts retailers. Pleasedo not call JBL for this, we stock onlythe pre-made harness as supplied withthe amplifier.

+12V Battery Wire (Yellow)

• Connect the yellow wire directly to+12 volt terminal of the battery.

• If it is necessary to extend the powerwire, use 12 gauge or larger wire thatis heat and oil resistant.

• The GTS100 will draw as much as20-Amps from the vehicle’s electricalsystem, enough to overload conven-tional vehicle wiring. Therefore the+12 volt power supply must be directly from the positive side of thebattery. Do not connect to the vehicle’s fuse block or to a wirefeeding other accessories.

• To prevent electrical system damageor fire, a fuse holder and fuse (notincluded, maximum 20A) must beinstalled in the power supply wire, asclose to the battery as possible, andbefore the wire travels through thefirewall or other metal panel.

Ground Wire (Black)

• Proper grounding is extremely impor-tant. It has a significant effect on theoverall performance and noise levelof the system. The ground wire mustbe solidly connected to a major sheetmetal structure of the vehicle. Usuallythe power supply ground wire can beconnected to a sheet metal panelnear the amp mounting location.Scrape all paint and primer off thesheet metal at the grounding point toensure a good electrical connection.Attach the wire to the grounding pointwith a sheet metal screw and lockwasher (preferably a star lock washer)or a bolt/lock washer/nut set.

• In some vehicles, such as those that have non-metal bodies, it maybe necessary to extend the powersupply ground wire and connect it toa frame rail or even directly to thenegative (-) terminal of the battery.Use heat and oil resistant 10 gaugeor larger stranded copper automotivewire and crimp or solder and insulatethe wire-to-wire connections. Keepthe extension wire as short as possible.Solder or crimp a terminal on the endof the extension wire and connect itto the frame or battery terminal.

• When multiple amplifiers are installedin the system, it is often best toground all of the amplifiers and signalprocessors to the same point to pre-vent noise pickup from a groundloop. In some unusual installationsthe noise level will be lower if theamplifier or amplifiers are groundedto the same point that the head unitis grounded. Use of heavy gauge

14


wire for all grounding, even signalprocessors and head units, can alsohelp to minimize possible noise pickup.

Remote Turn-On Wire (Blue withWhite Stripe) Because the JBL GTS100 includesCommon Sense 2-way turn-on circuitry, you have two options forremotely activating the amplifier. Whenusing the speaker level inputs with ahead unit that includes a BTL poweramp it is not necessary to connect theremote wire. The amplifier will automati-cally activate whenever you turn on thehead unit. If the head unit is not of thehigh power BTL type, Common Sensewill not work. You will need to connect aremote wire as discussed below. If youare using the line level inputs follow theremote wire connections listed below.

The remote power control system turnsthe GTS100 off when not in use to pre-vent discharging of the vehicle’s bat-tery. When +12 volts is applied to theremote wire the amplifier is turned on. Ared LED on the end panel of the ampli-fier lights whenever the amplifier is on.If the head unit has a +12 volt automaticantenna or amplifier remote activationwire, connect it to the blue/white wire ofthe GTS100.

Some head units have no automaticantenna or power amp activation wire.Other decks have automatic antennawires that are “on” only when the radiois used (the +12 volt signal is off when atape is played.) In such cases, connectthe remote turn-on wire to an unusedaccessory terminal in the fuse block, orany other +12 volt source that is turned

15

on and off with the vehicle’s ignitionswitch. The remote on/off system drawsnegligible current so a relatively small(18 or 20 gauge) extension wire may beused. Be sure to securely crimp or sol-der and insulate the wire-to-wire con-nections.

Audio Input Connections

Line Level Input ConnectionProper wiring between the signalsource, any other components in thesystem and the GTS100 will help tokeep noise levels in the system low.Use high quality, low capacitanceshielded wire. Keep the wire as short as possible. Do not splice shieldedwires together. Do not run audio signalwires alongside power wires either forthe amp or the vehicle’s standardpower wires. When wires are run forlong distances, separate the audio sig-nal wires from power supply wires orvehicle wiring harnesses as much aspossible. When signal wires and powerwires must cross, try to keep them per-pendicular. Avoid routing any wiresnear accessories such as ignition con-trol modules, tachometers, fuel pumpsor fan motors.

The line level inputs of the GTS100accept standard phono plugs (alsocalled RCA plugs.) The outputs of mosthead units, equalizers or crossoversalso accept RCA connectors. If anothertype of connector is used, adapters orspecial cables may be needed. Properwire and connectors can be obtainedfrom any JBL authorized installationspecialist.


outboard crossover, use the “R” modeand connect your source input to theright channel input.

Simultaneous Stereo + Mono – For thisconnection, the Input Mode switch is leftin the stereo position. Main speakersare connected normally to the left andright stereo outputs, and a center-channel or subwoofer speaker is con-nected in bridged mode. Refer to thediagram on page 19 in the “SpeakerConnections” section for details.

Speaker Level Input ConnectionsWhen speaker level signal is used todrive the GTS100, the signal goes intothe amp through a special four wire harness/connector (see the “Controlsand Connectors” section) If extensionwires are needed between the headunit output and the amplifier unit, useconventional speaker wire. Keep thewiring inside the passenger and trunkcompartments and make the wires asshort as possible. All connectionsshould be securely crimped or soldered and insulated with heatshrink tubing.

Use the color code of the input harnesswires and the identification on theradio/tape deck output wires to be surethat left and right channels are correctlyconnected and the positive/negativepolarity of each channel is connectedcorrectly. For example, the left positiveoutput of the head unit must be con-nected to the left positive input of theGTS100. The color code for the speakerlevel input harness is as follows:

NOTE: The GTS100 has a built-in

80Hz low pass (subwoofer) crossover and

a 100Hz high pass (satellite) crossover.

Be sure the crossover switch is properly

set for the chosen system configuration

(See the “Typical Applications” section

for suggestions). If you have any ques-

tions about how to set this switch, con-

tact your local JBL dealer .

Input-Mode Switch This switch is set according to the num-ber of input channels connected to theamplifier and the desired mode of oper-ation. See diagrams on pages 7 and 8and the descriptions below for options.

Standard Operation – When using theGTS100 as a conventional stereoamplifier simply connect the preamp-level source outputs directly to the twogold RCA connectors or connect thehead unit speaker outputs to the speaker-level inputs with the inputmode switch set to “stereo.” Whenusing two sources, both the speakerand preamp-level inputs may be usedsimultaneously. Be sure to maintain leftand right channel consistency.

Bridged Mode Operation – To selectbridge mode operation, set the inputmode switch in either the “R” only or“L+R” position. In the “R” position, sig-nal from the right channel input is fed toboth amplifier channels. In the “L+R”position, the signal from both channelsis summed internally. When using a sin-gle GTS100 for mono mode fed with astereo signal it is best to use the “L+R”mode. When using a GTS100 for eachchannel, or when feeding a singleGTS100 with a mono signal from an

16


Speaker Level Input Color Codes

Left (+): White

Left (-): White with Black Stripe

Right (+): Gray

Right (-): Gray with Black Stripe

Using Both the Speaker Level Inputand Line Level Input TogetherIn some systems it may be desirable touse both the speaker level inputs andline level inputs simultaneously. Forinstance, if you have a stock head unitin your car you may connect the speaker-level inputs of the head unit to theGTS100. You may simultaneously con-nect a CD player equipped with preampvolume control to the preamp-levelinputs of the GTS100. The UniversalInterface circuitry of the GTS100 willisolate the inputs from each other whilemixing both signals. Therefore switch-ing from one source to the other is assimple as turning the unused source off, and turning the desired source on.No other switches or relay boxes areneeded.

When using this setup it is also possible,using the wiring setup shown below, toallow either of the two sources toremotely turn on the amplifier. This isnot necessary if the factory radio is ofthe high power BTL type and is con-nected to the speaker level inputs. TheCommon Sense turn-on circuit will acti-vate the GTS100 when a poweredsource is used, and the conventionalremote connection of the preamp-levelsource will activate the amp when it isused.

17

Speaker ConnectionsWhen connecting speaker wires, besure that no uninsulated wire remainsexposed and no loose strands of wiretouch either an adjoining wire, terminalor a metal surface. Securely crimp orsolder all connections and insulatethem with heatshrink tubing.

Use high quality 18 gauge or largerspeaker wire for the amplifier to speakerconnections. Larger wire or special highperformance speaker cables mayimprove the performance of some systems.

Be very careful when speaker wire isrouted through a door hinge area todoor mounted speakers. Use grommetsand strain reliefs wherever necessary toprevent damage to the wires.

The proper speaker connectiondepends on whether the GTS100 isused bridged or stereo. The speakersare connected to the amplifier with theincluded wire harness. If you wish topurchase the raw connector to make acustom-length harness, the part numberis listed in the Specifications section.This item is commonly available fromlocal electronic parts distributors.

From Head Unit #1Remote orAntenna Output

Dual Source Remote Wiring diagram.

From Head Unit #2Remote orAntenna Output

To GTS100Remote

1N4001Diode

1N4001Diode


same time. This is sometimes used forcenter-channel applications or for inex-pensive subwoofer addition, essentiallycreating a 3-channel system. However,unlike a true bi-amplified subwooferconnection, this system configurationdoes not provide for control of sub-woofer-satellite balance, it requires theuse of a passive subwoofer crossoverinstead of the superior active circuitryalready built-in to the GTS100, and itdoes not separate the power amps driving the satellites from the amps driving the subwoofer. Therefore thisconnection is best used for addition of a center-channel, or as an interim stepas you build up to a true bi-amplifiedsubwoofer-satellite system. Connect themain pair of stereo speakers as in thestereo mode, connect the mono speakeras described above for bridge-modeconnection (see diagram on page 19).For use in center channel applications,a high-power “L-Pad” or power fadercan be used to attenuate the centerchannel for proper level matching. Forsubwoofer-satellite use, connect a non-polarized capacitor in series with eachmain speaker, and a high-power inductor(coil) in series with the subwoofer. Yourauthorized JBL dealer will help youchoose the correct values for your par-ticular components. The input-modeswitch should be set to “STEREO”.

Please do not call JBL for this part; westock only the harness assemblies assupplied with the amplifier.

To get proper bass response andstereo imaging, all the speakers in thesystem must be “in phase.” The inputsterminals of the speakers will be markedin some way to identify positive andnegative polarity. Make sure that thepositive (+) speaker terminal is attachedto the positive (+) amplifier connectionin every speaker-to-amp connection. Alltwo conductor speaker wire has oneconductor marked in some way so itcan be easily traced.

The speaker output wire harness colorcodes are listed below:

Speaker Output Color Codes

Left (+): White

Left (-): White with Black Stripe

Right (+): Gray

Right (-): Gray with Black Stripe

Stereo Connection – Connect eachspeaker directly to the speaker outputharness according to the color-code listed above. The input-mode switchshould be set to “STEREO”

Bridged-mode Connection – Connectthe loudspeaker positive (+) terminal tothe RIGHT channel positive wire (Gray).Connect the loudspeaker negative (–)terminal to the LEFT channel negativewire (White with Black stripe). Theinput-mode switch should be set to “R”or “L+R”.

Simultaneous Stereo + MonoConnection – The GTS100 may beused to drive a stereo pair of speakerswith a mono (bridged) speaker at the

18


19

L

R

LINE IN OUT

NOM

MIN MAXGAIN

INPUT MODE

STEREO


LOW

+R-

+L-

+R-

+L-

SPEAKEROUTPUTS

SPEAKER INPUTS

BRIDGED

FUSE 20A

POWER

GNDBAT(+) REM

(+)

(+)

(–)

(–)(+)(–)

C C

L

Subwoofer (Low Pass)

Tweeter/Midrange Satellites(High Pass)High Pass Satellite

Crossover Frequency: 100Hz

C: 300µF Capacitor100V, Non-Polorized

Subwoofer Low PassCrossover Frequency: 100Hz

L: 6.2mH Air Core Inductor

20A

Right Left

Component Values for 4 Ohm Loudspeakers*

*You may scale the 100Hz values listed to a different desired frequency by using the following formulas:

A. Satellite/Subwoofer

High-Pass: x 300µF = New Capacitor Value100

desired frequency in Hz

Low-Pass: x 6.2mH = New Inductor Value100

desired frequency in Hz

L

R

LINE IN OUT

NOM

MIN MAXGAIN

INPUT MODE

STEREO


LOW

+R-

+L-

+R-

+L-

SPEAKEROUTPUTS

SPEAKER INPUTS

8 Ω L-Pad(Optional But Recommended)

BRIDGED

FUSE 20A

POWER

(+) (–)

(+) (+)(–) (–)Stereo, Non-BridgedSpeaker Connection*

Center ChannelBridged Speaker Connection*

* Center Channel Speaker Minimum 8 Ohms, Main Speakers Minimum 4 Ohms When Used Simultaneously.

8 Ω Minimum

4 Ω Minimum 4 Ω Minimum

20A

B. Center Channel

GNDBAT(+) REM

Simultaneous Stereo-MonoConnection Diagrams


carefully to the system output, adjustthe volume control of the radio/tapedeck to the point where you first beginto hear audible distortion. Reduce thelevel just to the point where the distor-tion goes away. This is the maximumundistorted output level of your headunit and signal processors, and shouldnot be exceeded during use. If audibledistortion does not occur, continue toincrease the level until the head unit isturned all the way up. If this settingdoes not provide adequate volume lev-els, gradually increase (turn clockwise)the gain control of the GTS100 until thesystem plays as loud as necessary orwhen the first signs of distortion areheard.

When multiple amplifiers are used inthe system, it is best to adjust the gainof the amplifier driving the main (usuallyfront) speakers first. Then turn down thehead unit’s volume control to a comfort-able level, and adjust the remainingamplifiers for the desired system bal-ance. You will find this easiest to do byadjusting the amplifiers in the followingorder: 1) front-channels, 2) rear-chan-nels, 3) subwoofers. Complex systemsincorporating tri-or quad-amplificationcan be time consuming to adjust. Yourlocal authorized JBL installation special-ist is the best person to help with suchadjustment.

Other CharacteristicsTurn-On Delay – When installed asdescribed in this manual, the GTS100will turn on and off with the head unit orthe vehicle’s ignition switch. When theamplifier is turned on, there is a timedelay of several seconds (longer in cold

20

Operation

Before operating the GTS100, recheckall wiring connections to make sure theyare correct and secure. Be sure that a20 amp fuse (not included) is installedin the +12V line next to the battery.Reconnect the negative ground (–) terminal of the battery. Make sure that the input mode selector, crossoverswitch and preamp mode switch areproperly set.

Gain AdjustmentsThe setting of the gain control on theGTS100 is important to ensure properperformance, low noise levels, andmaximum reliability in the system. As ageneral rule, controls on components atthe front-end of the system (Source,equalizers, electronic crossovers, etc.)should be set as high as possible, withthe amplifier gain control set as lowas possible while still providing ade-quate volume levels. Using a high sig-nal level from the source and a low gain setting on the amplifier will helpkeep background noise levels in thesystem low.

To adjust a system using a singleamplifier, start with the amplifier inputsensitivity controls fully counterclock-wise. Some radio/tape decks have addi-tional output level controls or switches.Set those to their maximum position.Set the level controls on any associatedequipment such as equalizers and electronic crossovers to the maximumposition or as recommended by themanufacturer. Set all Bass/Treble orequalizer controls to their centered orbypassed positions. While listening


and 16 volts. Check that the powerwires are not reversed.

If the GTS100 is operated at very highpower levels in a high ambient tempera-ture situation, the unit may not be ableto radiate all the heat generated bysuch operation. If the temperature ofthe amplifier reaches a level that couldcause damage, the thermal overloadprotection circuit will turn the amplifieroff. It will turn the amp back on againwhen it cools off. Repeated activation ofthe protection circuits indicates that thesystem is being improperly operated orthat the amplifier should be relocated toan area that either has a lower ambienttemperature or that allows more air cir-culation around the unit.

Fuse Replacement – If the fuse on theGTS100 must be replaced, DO NOTuse a fuse rated for higher current lev-els. The fuse size for the GTS100 is 20amps. Exceeding the standard fuse sizeor bypassing the fuse holder will voidthe warranty and may cause seriousdamage. It is extremely rare for thisfuse to blow. If it blows repeatedly, it ismost likely that the amplifier has aninternal problem that will need to berepaired by an authorized service cen-ter. The only external cause for thisfuse to blow is reversed polarity of thepower wire connections.

Solving Noise Problems

The power supply system of every vehi-cle has some electrical “noise” that isgenerated by the ignition system, thealternator, the accessories, and theirwiring. High performance audio equip-

weather) before the amplifier will pro-duce sound. This eliminates the chanceof annoying noises produced by theradio or signal processors being ampli-fied and passed to the speakers whenthe system is first turned on.

Power Consumption – Operating theGTS100 when the vehicle is not runningmay discharge the battery. Under nor-mal operating conditions, the units willdraw an average of 5 amps from thebattery. At high volumes, the amplifiercan draw as much as 20 amps for briefbursts. After even a short period oftime, this current drain can dischargethe battery to the point that it will notstart the vehicle. Power consumptionunder “no signal” conditions is less than1 amp for the GTS100. Even this smallpower usage can discharge a batteryover several hours time. When theGTS100 is turned off, there is no cur-rent drawn from the battery despite thedirect-to-battery power connection.

Overload Protection – The GTS100incorporates elaborate protection cir-cuitry to prevent damage to the ampli-fier circuitry and ensure reliable opera-tion. This circuitry will turn the amplifieroff in the event of overheating, a shortcircuit on the speaker output wiring, orimproper power supply connections. Ifthe amplifier cycles on and off, or doesnot work at all, a problem in installationor an abnormal electrical condition isindicated. Check speaker wiring forshort circuits or impedance loads signif-icantly below 2 ohms, (4 ohms inbridged mode). Check the power supplyvoltage at the input of the amplifier tobe sure that it is normal, between 11

21


the amplifiers and signal processors areall grounded to the same point on thechassis. Usually the head unit does notneed to be grounded to the same pointas the rest of the system, but in someinstances grounding the head unit tothe same point will also help. If thisdoes not adequately reduce the noiselevel, try another ground point on thecar frame. Some ground points maywork better than others. In some in-stances with plastic-bodied vehicles,grounding the source unit and/or amplifier directly to the battery will provide the best results, although, usually, this provides the worst resultswith most cars.

In complex systems involving compo-nents from different manufacturers, ithelps to know the type of power sup-plies used in each component. For low-level signal processors such asequalizers or electronic crossovers, amanufacturer may either use a powersupply which is isolated through a DC-to-DC converter, or a simple regulatedsupply from the +12V vehicle battery.Components using the latter type ofsupply can be identified by a direct con-nection from power ground to the shieldof the RCA jacks (measured with noother connections present). For thesecomponents, the best ground connec-tion may be one where the powerground wire is not connected at all! TheRCA cables will provide the groundconnection to the source unit. Pleasenote that this is only appropriate forunits which draw less than 500mA ofcurrent. Higher power units of this typeare best connected with their ground

22

ment is more likely to pick up suchnoise than conventional equipmentbecause it has wide frequency band-width and high gain (amplification) cir-cuits. The GTS100 has built-in powersupply filters to help prevent noise prob-lems. If noise occurs it is probably theresult of improper installation. The following suggestions will help you eliminate most noise problems.

Source Noise – Often noise in a systemis picked up by the signal source.Before attempting to eliminate noisefrom the “amp” be sure it is not beingpicked up by the signal source and thenpassed on to the amp. To do this, con-nect the signal source output to anexternal amplifier which has no otherconnection to the vehicle except for theaudio signal leads. A battery-poweredportable with line-inputs works well forthis. Listen to see if the noise is presentin the signal from the source unit. If so,consult the manufacturer of the sourceunit, or your JBL dealer, for help in elim-inating this noise. If there is no noise inthis signal, it can be eliminated as thesource of the noise in your system.

Ground Loops – The vast majority ofnoise problems in car audio systemsare caused by inadequate or impropergrounding. The head unit, the amplifierand any other components must begrounded to a major metal member ofthe vehicle’s frame. Make sure tochoose a solid metal ground point. Inmany new vehicles some structural ele-ments are made of plastic.

Although not usually necessary, practi-cal experience shows that often thenoise level in the system will be lower if


must cross, they should cross at rightangles. If you suspect that power linenoise is being induced in the signalleads, you can repeat the test forsource noise described previously, butperform the test at the amplifier end ofthe signal cables.

Other Noise Sources – Common noiseproblems will be solved by propergrounding and power supply connec-tions. However, there are many noisesuppression devices (such as sparkplug and coil lead suppressers androtor and coil bypass capacitors) avail-able at auto parts or car stereo stores.There are also noise suppressers thatcan be connected directly to the alter-nator that are effective in some situa-tions. The use of any such suppressorsshould be discussed with a JBL autho-rized installation specialist. Certainvehicles are particularly “noisy,” espe-cially models that have solid state igni-tion systems or that have non-metalbodies. Such vehicles may require elec-trical noise suppression devices whichare not normally needed.

Antenna – A common noise problem isgenerated by a “ground loop” producedby the antenna shielded cable beinggrounded at both the antenna mountingpoint and at the head unit input. In thisinstance, insulate the antenna groundfrom the chassis of the vehicle at theantenna mounting point so the antennashield is grounded only at the radio’santenna input. Commercial antennaground-loop isolators are also available.

Switching Noise – The GTS100 has ahighly developed switching power sup-ply which generates some RF interfer-

wires connected directly to the chassisof the head unit. The trickiest groundingtask is created when some componentsof this type are mixed with other compo-nents using isolated supplies. For thistype of system, the following groundingscheme will usually work:

1. Connect the head unit chassis to asolid vehicle ground using a short,heavy gauge wire (>AWG10). Do notconnect this to the vehicle’s wiringharness, but go directly to a metalpart of the vehicle.

2. Connect all non-isolated signal-processor grounds directly to thehead unit chassis at the same point.Run each wire individually. Due towire resistance connecting multiplewires to a single wire, then runningthe single wire to the head unit, is notthe same!

3. Connect all amplifier and isolatedsignal processor grounds directly tothe vehicle chassis at the same pointas each other, but not necessarily tothe same point as the head unit.

Power-line Noise – The built-in powersupply filter of the amplifier makesexternal filters unnecessary. In somecases, power supply noise can enterthe system through the head unit powersupply or the supply of an equalizer orother signal processor. Putting a filteron the head unit or signal processorpower supply input may then be helpful.

Power wires carrying high currents mayinduce noise in nearby signal wires.Make sure that power wires and signalwires do not run together for long dis-tances. When power and signal leads

23


Additional SystemConfigurations for Add-On or Upgrade

The features and capabilities of theGTS100 provide tremendous systemdesign flexibility. The diagrams on thefollowing pages illustrate some of thesystem possibilities. They are in orderof increasing complexity, showing theway a system may be upgraded in logical steps. Although the systems areshown using speaker-level connectionfrom the head-unit, they may be builtusing any combination of speaker orpreamp level inputs, depending on thecapability of your head unit. (See pages 25-26.)

24

ence as a result of its switch-modeoperation. Although this is internally filtered and shielded by the GTS100chassis, some unusually sensitiveinstallations may pick up switchingnoise, especially when listening to weakAM radio stations. If this unusual situa-tion occurs, one of the following installa-tion corrections will typically eliminatethe problem. 1) Relocate the amplifierto a position farther away from the radioor radio antenna. 2) Move the electricalground of the head unit and/or amp to adifferent point on the vehicle’s chassis.3) Keep the amplifier power supplywiring away from the radio or antennawiring. 4) Wrap the +12 volt power sup-ply wires for the radio/tape deck withmetallized shielding tape or groundbraid and ground the tape to the chas-sis of the vehicle.

Maintenance

The GTS100 does not require any regu-lar maintenance. Periodically checkingthe main power supply and groundingpoints and terminal connections isadvisable. Be sure the connections aresolid and corrosion-free. Loose or cor-roded connections can cause annoyingintermittent noise or unusual opera-tional problems. Do not allow dust toaccumulate on the amplifier heat sinks.It will reduce the amplifier’s ability todissipate heat. Occasional vacuumcleaning will prevent dust accumulation.


25

R– R+– +

L– L+– +

GTS100

L– L+– +

R– R+– +

GTS100

Front Outputs Rear Outputs

Front Full-Range Speakers

Rear Full-Range Speakers

System 1Add Power to Main Speakers

Add a GTS100 to the main(usually front) outputs of an existing head unit.Secondary speakers(usually rear-fill) connectto the head unit's internalamplification.Next Step:Add a second GTS100 toamplify the other set ofspeakers or a subwoofer(see System 2).

Use the GTS100 to drive 1 or 2subwoofers with the head unitpowering the main speakers.This is an excellent way to upgrade a good stock system.Next Step:Add power to Front Full-Range Speakers (see system 3).

L– L+– +

R– R+– +

GTS100

L– L+– +

R– R+– +

– +

GTS100


Front Full-Range Speakers


1 or 2Subwoofers

System 2AAdd a Subwoofer (Active)

Use the GTS100 inSimultaneous Stereo + Mono mode to drive mainspeakers with subwoofers.A passive crossover is needed for this as described on page 18.Next Step:Add a second GTS100 to power subwoofers andmain speakers individually(see system 3).

L– L+– +

R– R+– +

GTS100

L– L+– +

R– R+– +

+ –


Front Speakers


Subwoofer

System 2BAdd a Subwoofer (Passive)

GTS100


26

L– L+– +

R– R+– +

GTS100

GTS100

L– L+– +

R– R+– +

+–


Front Satellite Speakers

Preamp output to preamp input


System 3Add a Second GTS100

1 or 2Subwoofers

GTS100 GTS100

L– L+– +

R– R+– +

GTS100

GTS100

GTS100

L– L+– +

R– R+– +

+–




Rear Satellite Speakers

System 4Add Power to the Rear

1 or 2Subwoofers

GTS100 GTS100 GTS100

L– L+– +

R– R+– +

GTS100

GTS100

GTS100

L– L+– +

R– R+– +

+–



Rear Satellite Speakers


System 5Add a SecondSubwoofer Amplifier

GTS100

+– Subwoofers

GTS100 GTS100 GTS100 GTS100

Get more power and systemcontrol by adding a secondGTS100 to power the mainspeakers and subwoofersindividually. Use the built-incrossover to high-pass thefront speakers and low-passthe subwoofers.Next Step:Add power to the Rear Full-Range Speakers.Note: For Non-Fading bass, also connect the rear-channel head unit speaker output to the speaker level input of thesubwoofer GTS100.

Add an amp for the rear speakers for higher volumecapability and more control.Next Step:Add more subwoofer power.

For the ultimate inbass output, add a second subwoofer amplifier for a totalsystem power of 340 Watts RMS!Note the cross-linking of preampinputs for the twosubwoofer amplifiers to provide non-fading bass.Next Step:Add additional amplifiers in bridge-mode to the front andrear main speakers. Then add electronic crossovers and biampfront and rear speakers.


27

In Case of Difficulty

Power-on light does not come on. • Head unit not on; turn the head unit on.

• Ground wire is disconnected or defective; check for continuity with an ohmmeter between the GTS100’s ground terminal and a known chassis ground point.

• Battery wire is disconnected or defective; check for approximately +12 volts between the GTS100’s Battery and Ground terminals.

• Blown fuse; check the GTS100’s 20 amp fuse located on the endpanel near the power connector. If it is blown replace it with an identical one. If the new fuse blows immediately, then check all the wiring connections. If no fault is found, consult your JBL dealer.

• Remote-on wire between the head unit and the GTS100 is disconnected or defective; check for +12 volts between the GTS100 remote on wire and the ground wire with the head unit on.

• Head unit connected to speaker-level input is not BTL high-power type and noremote wire is connected; connect remote turn-on wire to switched +12V source.

Remote-on light is illuminated, but no • Incorrect switch settings; make suresound is heard from some or all of the that all switches (input mode, line, andspeakers. crossover) are in their correct positions

for your system configuration.

• Incorrectly connected or shorted speaker wires; check for shorts in wiring.

• Defective or disconnected audio cables;check for continuity and replace if necessary.


28

(continued)

Remote-on light is illuminated, but no • Incorrect gain adjustment; verify that sound is heard from some or all of the the GTS100 gain controls are not speakers. turned completely down. If they are,

sound output level may be very low and may give the impression that the system (or part of the system) is dead.

• Defective head unit or signal processor;check each component for proper wiring and operation.

• Defective GTS100; If there is audio signal present at the inputs of the GTS100 and there is no output, the GTS100 may be defective.

Alternator whine through the audio • Ground loops; Follow the wiring system with the engine running. suggestions in the section called

“Solving Noise Problems.” Also, verify that the chassis grounding point you have chosen is true ground by checkingfor continuity between the chassis ground point and battery ground.

Bass output from speakers too low. • Speaker wired out of phase; check for proper polarity on all speaker wiring (+ amp terminal to + speaker terminal and – amp terminal to – speaker terminal.

If you want to talk to us about any problems, call JBL Customer Service at 1-800-336-4JBL Between 9AM and 5PM Eastern time.


29

Specifications

Continuous Power Output 35 watts x 2(20Hz – 20kHz, (4 Ohms, 0.05% THD)14.4V Battery Voltage) 50 watts x 2

(2 Ohms, 0.08% THD)100 Watts x 1(4 Ohms, 0.08% THD)

Signal to Noise Ratio 100dBA

Frequency Response 10Hz – 50kHz (+0, – 1dB)20Hz – 20kHz (+0, – 0.1dB)

Damping Factor >200

Slew Factor >5

Line Level Input Sensitivity 100mV – 4V RMS (500mV at center detent)(for rated power)

Line Level Input Impedance 10k Ohms

Speaker Level Input Impedance 15 Ohms

Speaker Level Input Sensitivity 200mV – 8V RMS (1V at center detent)

Preamp Output Sensitivity 2V Out for 4V Speaker Level Input

Minimum Speaker ImpedanceSingle Ended, Non-Bridged 2 OhmsBridged 4 Ohms

Built-In Electronic Crossover 80Hz, 18dB per octave Low Pass FilterFrequency and Slope 100Hz, 18dB per octave High Pass Filter

Power Requirement 11 to 16V DC Negative Ground

Fuse Size 20 Amp ATC Type Fuse

Size (L x W x H) 65/8" x 91/4" x 2" (168.3mm x 235.0mm x 50.8mm)

Weight 4lbs. 3oz. (1.90kg)

Speaker Input / Output Mating Molex Mini-Fit Jr. # 39-01-2040Connector Metal Pins: 39-00-0038

Power Mating Connector Plastic Housing: AMP #1-480700-0Metal Pins for Ground & +12V: AMP # 350923-3Metal Pins for Rem. In: AMP # 350536-1


JBL Consumer Products, Inc.80 Crossways Park WestWoodbury, NY 11797

8500 Balboa Blvd.Northridge, CA 91329800 336 4JBL

Part No. JBLGTS100OM

A Harman International Company


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Manual JBL Gts 100

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