Edward J M
Senior HTF Member
- Joined
- Sep 22, 2002
- Messages
- 2,031
This topic has generated some interest in the Speakers and Subwoofers Forum recently, particularly as it applies to subwoofer calibration. Even though it is a software related topic, it certainly has bearing in this forum.
I use Avia to calibrate my system to Reference Level, so the Avia subwoofer level listed is my preferred setting for my system.
Here are the results - again on my system with my copy of Digital Video Essentials:
Set-Up:
B&K Model 2205 sound meter placed on a tripod at the listening position at head level, facing forward at a 45 degree upward angle. Meter setting is C-Weighted, Slow.
AVR-3803 Master Volume set to 0.0
Remember, DVE is supposedly encoded 10 dB less than Avia.
Results:
Avia Surround Channels: 85 dB
Avia Subwoofer Tone: 82 dB (average of all channels)
DVE Surround Channels: 76 dB
DVE 5.1 Subwoofer Calibration Tone: 88 dB
DVE 6.1 Subwoofer Calibration Tone: 88 dB
Comments and Interpretation:
The DVE surround channels are right where they should be - almost exactly 10 dB lower than the Avia surround channels.
It is interesting to note the Avia subwoofer calibration tone uses the surround channel and redirected bass. Therefore the surround channel speaker contributes volume to the Avia subwoofer calibration tone.
In contrast, the DVE subwoofer tone does not use the surround speaker channels at all. It only uses the LFE channel.
A DD/DTS pre/pro automatically boosts the LFE channel 10 dB. If a disc encoder wants the LFE channel to provide the same volume as the redirected bass from a surround channel, the LFE signal must be encoded 10 dB less than the corresponding surround channels.
Conclusions:
The subwoofer calibration tone on my version of DVE is 12 dB higher than the corresponding DVE surround channels.
The subwoofer calibration tone on my version of DVE is also 6 dB higher than the Avia subwoofer calibration tone under identical room conditions at the exact same Master Volume level.
I can only speculate, but I suspect an improper encoding level for the LFE channel (0.1) is primarily responsible for this problem.
YMMV - it is possible later versions of DVE have been corrected - mine was an early pre-order version.
I hope this helps DVE users who are having problems with subwoofer calibration. Regardless, I strongly recommend comparing DVE to another disc like Avia or S&V or the older (OOP) VE as part of your subwoofer calibration process.
Regards,
Ed
I use Avia to calibrate my system to Reference Level, so the Avia subwoofer level listed is my preferred setting for my system.
Here are the results - again on my system with my copy of Digital Video Essentials:
Set-Up:
B&K Model 2205 sound meter placed on a tripod at the listening position at head level, facing forward at a 45 degree upward angle. Meter setting is C-Weighted, Slow.
AVR-3803 Master Volume set to 0.0
Remember, DVE is supposedly encoded 10 dB less than Avia.
Results:
Avia Surround Channels: 85 dB
Avia Subwoofer Tone: 82 dB (average of all channels)
DVE Surround Channels: 76 dB
DVE 5.1 Subwoofer Calibration Tone: 88 dB
DVE 6.1 Subwoofer Calibration Tone: 88 dB
Comments and Interpretation:
The DVE surround channels are right where they should be - almost exactly 10 dB lower than the Avia surround channels.
It is interesting to note the Avia subwoofer calibration tone uses the surround channel and redirected bass. Therefore the surround channel speaker contributes volume to the Avia subwoofer calibration tone.
In contrast, the DVE subwoofer tone does not use the surround speaker channels at all. It only uses the LFE channel.
A DD/DTS pre/pro automatically boosts the LFE channel 10 dB. If a disc encoder wants the LFE channel to provide the same volume as the redirected bass from a surround channel, the LFE signal must be encoded 10 dB less than the corresponding surround channels.
Conclusions:
The subwoofer calibration tone on my version of DVE is 12 dB higher than the corresponding DVE surround channels.
The subwoofer calibration tone on my version of DVE is also 6 dB higher than the Avia subwoofer calibration tone under identical room conditions at the exact same Master Volume level.
I can only speculate, but I suspect an improper encoding level for the LFE channel (0.1) is primarily responsible for this problem.
YMMV - it is possible later versions of DVE have been corrected - mine was an early pre-order version.
I hope this helps DVE users who are having problems with subwoofer calibration. Regardless, I strongly recommend comparing DVE to another disc like Avia or S&V or the older (OOP) VE as part of your subwoofer calibration process.
Regards,
Ed