Batman Begins BR PCM vs DD - AVS Forum
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post #1 of 9 Old 07-13-2008, 09:34 AM - Thread Starter
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I've got a question for the many Batman Begins Blu Ray owners, are you finding that the bitstream 5.1 track sounds better than the TrueHD/PCM? I have sampled them both from my PS3 and the DD sounds more full, more bass and louder than the PCM.

Set up: PS3 via HDMI to Yamaha V661.

PS3 (LPCM) and Batman Begins (TrueHD selected):
5.1 Ch. 48kHz 1.9-2.7 Mbps

PS3 (Bitstream) and Batman Begins (English) selected:
Multi-Channel 48kHz 640 kbps



I keep reading that PCM is -4db louder than Dolby Digital, but in this case the PCM sounds weaker. Has anybody else tested this or had this situation on any other br disc? Also, since the kHz are the same, does it even matter?
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post #2 of 9 Old 07-13-2008, 10:05 AM
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The Batman BR disc does not have a PCM track but rather a THD track, which sounds superior to the DD track in every way.

If you are confused on the differences between PCM vs lab codecs (THD/DTS-MA, etc), PM me and I'll be glad to point you in the right direction.

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post #3 of 9 Old 07-13-2008, 10:09 AM
 
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Quote:
Originally Posted by Kryptonick View Post

I've got a question for the many Batman Begins Blu Ray owners, are you finding that the bitstream 5.1 track sounds better than the TrueHD/PCM? I have sampled them both from my PS3 and the DD sounds more full, more bass and louder than the PCM.

Set up: PS3 via HDMI to Yamaha V661.

PS3 (LPCM) and Batman Begins (TrueHD selected):
5.1 Ch. 48kHz 1.9-2.7 Mbps

PS3 (Bitstream) and Batman Begins (English) selected:
Multi-Channel 48kHz 640 kbps



I keep reading that PCM is -4db louder than Dolby Digital, but in this case the PCM sounds weaker. Has anybody else tested this or had this situation on any other br disc? Also, since the kHz are the same, does it even matter?

The Dolby True HD at -4db would be quieter than the Dolby Digital track and that is why you probably think Dolby Digital sounds better...It is common for people to assume louder is better or at least for one's ears to think it's better....Make adjustments in volume and listen again.

The Dolby True HD track will show as PCM on your receiver/amp if you have a Playstation 3 and are outputting it via HDMI.
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post #4 of 9 Old 07-13-2008, 10:21 AM
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I'm running Batman Begins + TrueHD via a Panasonic BD30 > Onkyo 605 and the difference over DD is clear IMO...the easiest place I can point to for really hearing the sonic advantage of TrueHD is during any dialog of all things - the voices get thinner with the DD track, if that makes any sense. Try A/B-ing the audio again, this time jumping back and forth between TrueHD and DD while focusing your ears on the dialog, the TrueHD voices sound full/thick by comparison.

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post #5 of 9 Old 07-13-2008, 12:16 PM
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Warner DDtruHD tracks are often 5dbs softer than the 650kb AC3 track.

The proper setting for sharpness is always0.
Also my Oppo BDP-103D is region free.
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post #6 of 9 Old 07-13-2008, 12:37 PM
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this issue was discussed a lot in the comparisons between using Bitstream vs PCM on the PS3 settings.
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post #7 of 9 Old 07-13-2008, 04:10 PM
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Warner engages dialnorm on every single Dolby TrueHD track they've released. Once level matched the TrueHD track will sound better than the Dolby Digital one.
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post #8 of 9 Old 07-14-2008, 03:16 AM
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I have also the onkyo 605 and yes it sounds "weaker" untill you match the volume correctly.

So my advice, turn the volume up when choosing the THD track.

Boldly go.....
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post #9 of 9 Old 07-14-2008, 03:27 AM
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Less volume = more dynamic range headroom. The fact that the master volume level is quieter is a good thing, not a bad thing.
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