Why does Late Night Mode default to On for TrueHD on Onkyo AVR's? - AVS Forum

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Receivers, Amps, and Processors

ThePrisoner's Avatar ThePrisoner
08:15 PM Liked: 18
post #1 of 4
02-26-2008 | Posts: 2,178
Joined: Jan 2004
I was listening to the TrueHD track from The Bourne Ultimatum HD DVD. I have an XA2 bitstreaming into an 805 I'm auditioning. Bourne sounded flat and I had the volume up to +3.0db. I noticed that L. Night Mode was set to Auto. When I switched it off I was like wow, the TrueHD track came to life, I had dynamics. My question is why does Onkyo make Late Night Mode default to On when listening to TrueHD. Thanks.
mpgxsvcd's Avatar mpgxsvcd
08:41 PM Liked: 10
post #2 of 4
02-26-2008 | Posts: 5,284
Joined: Oct 2003
Apparently the new Yamaha receivers that can receive bitstream will also default their Dynamic Range Compression to on when a True-HD signal is detected. I still have not figured why that is.
ThePrisoner's Avatar ThePrisoner
04:08 AM Liked: 18
post #3 of 4
02-27-2008 | Posts: 2,178
Joined: Jan 2004
This is the only function I don't like about this receiver, how many others beside Onkyo & Yamaha default to this sort of thing. So when you bitstream a lossless track you should disable any dynamic compression, unless you want to listen late at night without cranking the volume
mpgxsvcd's Avatar mpgxsvcd
06:44 AM Liked: 10
post #4 of 4
02-27-2008 | Posts: 5,284
Joined: Oct 2003
I think it is something inherit in the Dolby Digital True-HD codec? I believe Dolby actually passes information with the signal so that the receiver can apply the Dynamic range compression more accurately.

In the case of the new Yamaha receivers I believe it has an adaptive DRC mode. This means that it will apply large amounts of DRC at low receiver volume levels. Then it will decrease the level of DRC as you increase the volume of the receiver. Therefore, if you play a movie quietly then it makes everything play at one volume so that you are not “hunting” for an acceptable volume. Then if you want to listen to the original track as it was mastered then all you have to do is turn the volume up. If you reach a certain volume level then the DRC is actually automatically canceled out.
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