2
Monitor Focusing Template Rear Left Rear Right Left Right Center 30° 30° 0° 100° 120° 110° 100° 120° 110° ITU-R BS.775-3
Monitor Focusing Template
Rear Left
Rear Right
Left Righ
t
Cent
er
30° 30°0°
100°
120°110°
100°
120°110°
ITU-R BS.775-3
1238CF
1 382
1234
1236
0.5 1 1.5 2 5 10 15 ( s)meter
1.6 3.2 5 6.5 16.5 32 50 (feet)
8320
8030
8040 / 8240
8050 / 8250
1032
8260
1237
8351
8020
8010
8330
95
98
103
104
96
92
97
100
102
104
92
94
97
98
100
99
100
93
89
93
109
85
88
90
92
94
93
94
101
97
105
109
115
86
82
87
90
92
94
96
98
97
98
107
102
111
115
121
91
87
91
84
87
89
91
93
91
92
100
95
103
107
113
85
81
86
94
102
106
112
99
Room acoustic improvementsSeveral acoustic improvements can be made in a typical rectangular room where an audio monitoring setup is installed. Here are a few suggestions.
Listening distance recommendations
ACut the room front corners at 30 degree angle using high-mass materials (concrete, bricks, mul-ti layered gypsum board, etc). In case building materials have me-dium mass, make sure to fill the empty space behind these walls with mineral wool.
BUse a combination of absorption and diffusion on the side wall surfaces. Note that thin layers of porous absorbers only reduce HF reflections.
CIf the room is large enough, use diffusive and absorbing ele-ment(s) on the back wall.
DControl low frequency room res-onances using a large amount of absorption material for example in the back of the room and in the ceiling. Carefully designed and located panel resonator absorb-ers can also be used.
EUse a combination of absorption and diffusion above the listening area to reduce acoustic reflec-tions from the ceiling.
Not recommended When too close to the monitor, the drivers - tweeter or midrange/tweeter - are not summing together properly at the crossover point, which affects the perceived frequency response balance.
Recommended The long-term sound pressure levels (SPL) displayed take into consideration an average room reverbera-tion time (RT60) of 0.3 sec. Note: at extremely long distances the SPL may become too low for the application.
E
A
B
C
D
A
B
MAI
-006
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