0°
Rig ht
Center
ft Le 30°
30°
Rear Left
Rear Right 100°
100° 110°
120°
120°
110°
ITU-R BS.775-3
Monitor Focusing Template
Listening distance recommendations
Several acoustic improvements can be made in a typical rectangular room where an audio monitoring setup is installed. Here are a few suggestions.
A
A
B
B
C D
E
A Cut the room front corners at 30 degree angle using high-mass materials (concrete, bricks, multi layered gypsum board, etc). In case building materials have medium mass, make sure to fill the empty space behind these walls with mineral wool. B Use a combination of absorption and diffusion on the side wall surfaces. Note that thin layers of porous absorbers only reduce HF reflections. C If the room is large enough, use diffusive and absorbing element(s) on the back wall. D Control low frequency room resonances 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 absorbers can also be used. E Use a combination of absorption and diffusion above the listening area to reduce acoustic reflections from the ceiling.
1
1.5
2
5
10
8010
92
89
87
82
81
8020
96
93
91
86
85
8320
95
92
90
85
84
8030
98
94
92
88
87
8330
97
93
91
87
86
8040 / 8240
100
97
94
90
89
8050 / 8250
102
98
96
92
91
8351
103
99
97
93
91
8260
104
100
98
94
92
1032
104
100
98
94
93
109
107
101
100
99
1238CF
102
97
95
94
1238
111
105
103
102
1234
115
109
107
106
1236
121
115
113
112
6.5
16.5
32
50
0.5
1237
1.6
3.2
5
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.
15
(meters)
(feet)
Recommended The long-term sound pressure levels (SPL) displayed take into consideration an average room reverberation time (RT60) of 0.3 sec. Note: at extremely long distances the SPL may become too low for the application.
MAI-0062
Room acoustic improvements