Application Note #10:
Building an effective high power
horn loaded 18” subwoofer
Eighteen Sound Technical DepartmentDecember, 2010
Eighteen Sounda AEB S.r.l. Company
Via dell'Industria 2042025 Cavriago
Reggio EmiliaItaly
Rev. 1.0PRELIMINARY
18” Horn Subwoofer kit
Rev. 1.0
•High performance 1 x 18” subwoofer system
•Multiple driver choice is possible: 18LW2400 or 18NLW9400
•18LW2400 woofer key features:
4” interleaved sandwiched voice coil (ISV)
Double silicon spider (DSS)
1200W AES power handling
•18NLW9400 woofer key features:
4” interleaved sandwiched voice coil (ISV)
Double silicon spider (DSS)
Neodymium magnet
1200W AES power handling
PRELIMINARY
18” Horn Subwoofer kit
18LW2400 Data
Rev. 1.0PRELIMINARY
18” Horn Subwoofer kit
18NLW9400 Data
Rev. 1.0PRELIMINARY
3
2
6
7
11B12B
1A
10
9
8
4
13
1416 15
5
3
1B12B12A
16
10
11A
9
8
2
6
4
5
15
13
14
18” Horn Subwoofer kit
Rev. 1.0
Internal view
•The enclosure should be made of Baltic birch plywood (15mm thickness)
•Bolts are M6x35mm
•M6 T-Nuts are recommended
•Handling, rigging and connectors are user’s choice
•It’s recommended to well damping the cabinet interior
•You should see an example of the required dampening on the image on the next page
•An high density dampening material, such as Dacron or other synthetic fibers, is required for better performance
PRELIMINARY
3
2
6
7
11B12B
1A
10
9
8
4
13
14 16
15
5
18” Horn Subwoofer kit
Internal view and damping material
Rev. 1.0PRELIMINARY
5
84
1B
17B 18 2
1A
3
12B12A
19
13
16
14
11B
6
9
17A
15 11A
10
7
18” Horn Subwoofer kitExploded view
Rev. 1.0PRELIMINARY
820 mm166 mm
97 mm
668 mm
785 mm
116 mm 625 mm
100 mm
815 mm
3
6
7
2
5
4
8
9
10
1B
1615 14
150 mm184 mm
238 mm458 mm
678 mm
238 mm297 mm
273 mm
517 mm
10
14
4
8
6
15
9
5
1B2
7
16
3
194 mm
18” Horn Subwoofer kit
Side wiew
Rev. 1.0PRELIMINARY
180 mm560 mm590 mm
1B12B12A
3
1A
16
18” Horn Subwoofer kit
Front Side
Rev. 1.0PRELIMINARY
410 mm
252 mm
95 angle 105 angle
328 mm
105 angle 102,5 angle
102,5 angle 110 angle
273 mm
18” Horn Subwoofer kit
Horn Details
Rev. 1.0PRELIMINARY
4
8
9
10
166 mm
135 angle 135 angle
116 mm
135 angle 135 angle
18” Horn Subwoofer kit
Rear Details
Rev. 1.0PRELIMINARY
6
5
85 angle
105 angle
497 mm
8mm diameter
440 mm diameter
416 mm diameter
42 mm
245 mm
77 mm280 mm
105 side
119 mm168 mm119 mm
Woofer details
Rev. 1.0PRELIMINARY
18” Horn Subwoofer kit
134 mm
75 mm
9 mm
30 mm
510 mm
55 mm
12 mm26 mm484 mm
510 mm
100 mm
100 mm
100 mm
100 mm
18” Horn Subwoofer kit
Bottom
Rev. 1.0PRELIMINARY
179 mm267 mm346 mm378 mm
28 mm
139 mm
80 angle
64,5 angle
83 angle
160 mm
50 mm
18” Horn Subwoofer kit
Bottom
Rev. 1.0PRELIMINARY
103 mm130 mm
590 mm617 mm
820 mm
23 mm50 mm510 mm
537 mm560 mm
8mm diameter
32 mm radius
100 mm radius
18” Horn Subwoofer kit
Bottom
Rev. 1.0PRELIMINARY
80 mm
117 mm
37 mm
160 mm
100 mm
100 mm
100 mm
100 mm
18” Horn Subwoofer kit
Bottom
Rev. 1.0PRELIMINARY
50 mm510 mm
560 mm
115 mm
575 mm625 mm
18” Horn Subwoofer kit
Bottom
Rev. 1.0PRELIMINARY
37 mm80 mm
102 mm145 mm
100 mm
100 mm
100 mm
100 mm
18” Horn Subwoofer kit
Bottom
Rev. 1.0PRELIMINARY
System Measurements and Suggested Settingswith 18LW2400 and 18NLW9400
PRELIMINARY
18” Horn Subwoofer kit
Rev. 1.0
PRELIMINARY
Unfiltered Magnitude Response, 2.83V/1m and relative Phase Response with 18LW2400
18” Horn Subwoofer kit
Rev. 1.0
PRELIMINARY
Impedance and Step Responsewith 18LW2400
18” Horn Subwoofer kit
Rev. 1.0
PRELIMINARY
Unfiltered Magnitude Response, 2.83V/1m and relative Phase Response with 18NLW9400
18” Horn Subwoofer kit
Rev. 1.0
18” Horn Subwoofer kit
Impedance and Step Responsewith 18NLW9400
Published by Eighteen Sound®. Copyright © 2011. All rights reserved. Any effort of placing this design into manufacturing is stricltly prohibited.
