Monitor Focusing Template

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