User Manual
Multichannel Monitoring Tutorial Booklet (M2TB) rev. 3.5.2
Masataka Nakahara : SONA Corporation
©2005 YAMAHA Corporation, ©2005 SONA Corporation
26 / 74
2-4-3. Music: DVD-A, Super Audio CD
The 5.1 channel (6 channel) playback response for DVD-A or Super Audio CD is shown below.
[Fig. 13] Playback specification for Music program (DVD-Audio, SACD)
A 5.1 playback environment for DVD-Audio or Super Audio CD differs from the 5.1 playback
environment for DVD-Video in the playback level of the LFE channel. For DVD-Audio or Super Audio
CD, the LFE channel is treated exactly the same as other channels. In other words, DVD-Audio and Super
Audio CD are actually completely discrete six-channel recording media, rather than 5.1 channel media.
Thus, in the format books for these types of media, it is clearly stated that “all channels including the LFE
channel must be recorded and played back at the same specifications,” and no reference is made to special
level balancing etc. at the time of playback.
However for DVD-Audio, the “DVD-Audio Software Production Guidebook (Supplemented Edition)”
published by the DVD-Audio Promotion Conference makes the following references to the handling of
the LFE channel.
[Regarding LFE bandwidth limitations] Excerpted and summarized from the DVD-Audio Software
Production Guidebook (Supplemented Edition)
The DVD-Audio specification document does not obligate bandwidth restriction of the signal recorded on
the LFE channel. This means that the LFE recording bandwidth can be determined by a decision at the
time of production. In general, some DVD-Audio players apply an LPF to the LFE output while some do
not. The same is true as to whether or not an LPF is present in the amp. This means that whether an LPF
is applied to the signal reaching the speaker in the end-user's playback environment will depend on the
individual situation. It is possible that in some end-user environments, no LPF will be applied at any point
in the player/amp/speaker chain, and in this case, unneeded high-frequency signals will be included in
LFE and may be played back. Thus if LFE is to be used for its intended purpose of low frequency effects,
appropriate filtering applied at the time of production will make it easier to obtain the same playback
result in differing environments. It is typical for the filter cutoff frequency to be in the range of 80 Hz–150
Hz. Limiting the bandwidth of the LFE has the additional benefit of improving MLP compression
efficiency.
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]
Full-range
±0dB
LFE : approx. 79dBC (20-120Hz)
L=C=R=LS=RS : 85dBC
All-pass level
LFE
L=C=R=LS=RS=LFE : approx. 71dB
1/3 octave band level
L=C=R=LS=RS (5.1ch / 6ch)
Wide-band Pink Noise
approx. 0VU
(-20dBrms)
Input Signal
(if 20-120Hz)