Hi again Chris, all,
If you'll recall my posts from last week about hearing definite differences with bitstream vs PCM
from the PS3 (regular DVDs) to my Denon 1909, thinking it only happened with Dynamic EQ, but then also noticed it without DEQ
. So I'd started a separate thread to try figuring out what's going on
... But now I'm correctly
Originally Posted by batpig
you should NOT hear a difference between bitstreamed DD and pre-decoded DD (sent as multich PCM) from the PS3. there is almost certainly some setting somewhere (e.g. DRC may be "on" for DD inputs) that is confounding the test.
I've done the test myself on PS3 + Denon setups (playing a DD track from an SD DVD) and they sounded identical.
either way, it's not really an "Audyssey" issue at all....
Last night I burned the DIY Audio Test DVD
from a member here to hopefully get a better idea of what was going on. Played the pink noise from the mains and they were the same, bitstream or PCM, to my ears and the SPL meter. The LFE pink noise was, as I expected, noticeably louder with bitstream, and registered 3-5dB higher than PCM depending on where the meter was -- I found that weird, with the meter sitting in the same place(s), the relative difference varied?? Read on...
Then I played individual tones, and the one from a main speaker still sounded the same to my ears (I think) bitstream or PCM, but the meter showed almost a 10dB difference!
Same exact spot, just the bitstream/PCM switch? Something changing with phase...?
Using the LFE tones, I started at 80Hz, and bitstream was 3dB louder than PCM (meter sitting about a foot from sub...). Going down to 75 or 70Hz, and bitstream/PCM were the same. I think somewhere Hz-wise PCM was a couple dB louder. Then at around 45 or 50Hz, bitstream was 10dB
Well that explains the difference I'm hearing in the movie tests.
I'm confused wondering what the heck is going on. It's like there was a totally wacky, random EQ being applied differently to bitstream and/or PCM somewhere along the line.And then I found the cause
, by doing something I'd never done: switched MultEQ to Off!
Every test tone was then exactly the same, bitstream and PCM. And I went back to all the movie scenes I was checking, DD and DTS, and sure enough, with MultEQ Off, every aspect is exactly the same to my ears, bitstream or PCM. (Even the -4dB Dialnorm offset DD doesn't have an overall level difference AFAICT; wasn't sure what to expect there.) Was glad that I ruled out the PS3 and found the actual cause, but don't know what's next...
So I assume this is pretty messed up and MultEQ shouldn't be changing the sound between different signal types, right? All 3 MultEQ modes do this. Like Off, Manual is fine too, though I don't have any manual adjustments anyway. Ever heard of anything like this Chris?
Think I should do a microprocessor reset? It's hard for me to believe that would fix it, since everything else seems to be working fine. I've never reset before, but I assume I'd lose all settings and have to run Audyssey again -- neither a huge deal, and I just ran it the night before after adding a back speaker... Wanted to get some input here to see how to proceed.
Thanks! (Please don't say this is normal.