User Manual

Multichannel Monitoring Tutorial Booklet (M2TB) rev. 3.5.2
Masataka Nakahara : SONA Corporation
©2005 YAMAHA Corporation, ©2005 SONA Corporation
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6-4. LFE channel level balance
For a DVD-Video (Dolby, DTS) or film production (Dolby, DTS, SDDS), adjust the amp gain so that the
band level of the LFE channel is +10 dB relative to the main channel.
Note that it is a mistake to adjust the amp gain so that the pink noise playback level shown by the sound
level meter is 95 dBC (=85dBC+10dB).
The most reliable way is to use the RTA, and make adjustments so that the 1/3 octave band levels are
approximately 81 dB. In this case, the all-pass level indicated by the sound level meter will be
approximately 89 dBC, not 95 dBC (=85dBC+10dB).
In cases such as DVD-Audio or Super Audio CD, where you set the band level of the LFE channel to the
same level as the band level of the main channels (±0 dB), the all-pass level shown by the sound level
meter will be approximately 79 dBC (if we assume the LFE playback bandwidth to be 20 - 120 Hz).
[Fig. 54] Playback level of LFE channel : DVD-Video, Movie
[Fig. 55] Playback level of LFE channel : DVD-Audio, Super Audio CD
40
50
60
70
80
90
AP(C)
20
31.5
50 80
125 200 315
500 800
1.25k
2k
3.15k
5k 8k
12.5k
20k
1/3 octave band center frequency [Hz]
SPL [dB]
All pass level : approx.79dBC
1/3 octave band level : approx.71dB
LFE channel (20-120Hz)
All pass level : 85dBC
1/3 octave band level : approx.71dB
Main channels
Full range is also available.
40
50
60
70
80
90
AP(C)
20
31.5
50 80
125
200 315
500 800
1.25k
2k
3.15k
5k 8k
12.5k
20k
1/3 octave band center frequency [Hz]
SPL [dB]
10dB
All pass level : 85dBC
1/3 octave band level : approx.71dB
Main channels
LS / RS for 3-1 and Movie program
All pass level : 82dBC
1/3 octave band level : approx.68dB
All pass level : approx.89dBC
1/3 octave band level : approx.81dB
LFE channel