PCM vs. Bitsream option - is there a difference when playing DTS-HD Master Audio disc
Yeah, 1.5 Mbps DTS vs 640 kbps DD make sense.
But PCM vs TrueHD vs DTS-MA makes absolutely NO sense.
PCM is the clear winner, not because it sounds better than DTS-MA or TrueHD, but because it requires absolutely NO decoding whatsoever.
But without TrueHD and DTS-MA, they couldn't give you enough reasons to buy new receivers. Practically everyone would get PCM for FREE.
Hi AcuDefTechGuy - I hear that you quite an expert on HD codecs and PCM in general, so I hope that can help me with some of this.
Over last few weeks I recieved valuable feedback on AVS forums, however, I am not sure I am better off then I was before - maybe a bit more confused
Here is how the story goes:
Myself and my brother-in-law had a "little" debate about sound quality when playing DTS-HD Master Audio 5.1 Blu Ray disc on a player that does not decode DTS-HD MA internally (Sony S1) via PCM option vs. playing teh same disc on a player (Samsung 1400) that sends DTS-HD MA bitstream to compatible reciever. .So we decided to test it out ourselves yesterday and we did
Background:
I have Samsung 1400 (with 1.7FW) so I can bitstream DTS-HD Master Audio 5.1 to my reciever (Denon AVR-988)
He has Sony BDP-S1 BD player and he cannot decode nor bitsream DTS-HD Master Audio 5.1, however, he can convert to PCM via menu on his Sony BDP-S1 BD player .
So what we did next, we played the same BD disc in both players and output via HDMI to Denon reciever.
We could not tell the difference in sound quality from player to player! The sound was excellent from both, even though I was getting DTS-HD Master Audio 5.1 light up on the Denon reciever when playing via Samsung 1400 and he was getting Multi Channel PCM display when playing from his Sony BDP-S1 BD player. The only piece of mind was that I was trully outputing DTS-HD Master Audio 5.1 because Denon reciever showed us so. The quality was exceptional (and we think identical) from both.
So what gives here, according to most (if not all) of feedback recieved on AVS forum, Sony BDP-S1 BD player should be only outputting lossy DTS core from DTS-HD Master Audio 5.1 discs but I can assure you, the quality was the same from both of our players !!!??? Should it be ? I am at a loss what's happening here. At the beginning, I was thinking that what my brother-in-law tells me , it is just his perception , but I have to be honest here: to me as well, the quality was identical ! So I guess, you do not need to have player that can bitstream DTS-HD Master Audio 5.1 after all (!) as you can obtain the same quality with PCM option! I would love to know why this is happening and maybe this is an excpected behaviour - I just always thought that the DTS-HD Master Audio 5.1 sound should be superior - especially over lossy DTS core ! Please remember that Sony BDP-S1 BD player does not decode DTS-HD internally and only can extract DTS core via bitstream or PCM option.
Couple other important items that have come up during our text:
Sony BDP-S1 BD player cannot output 7.1 surround sound when playing DTS-HD Master Audio 7.1 disc , even after converting to PCM - so that's a one shortcoming.
Also, the strangest thing is those menu sounds. They are on ( i.e. menus make sounds when navigating between different options: Scene selection, play etc...) when playing via PCM but not on (not sounds at all) when navigating when using Bitstream option. Some of you suggested that you can turn these menu sounds on or off via disc menu selection. Well, we looked and looked and no! There is no option to turn them on anywhere. We used "The day after tomorrow" disc. The funny thing is that the same behaviour with the menu sounds as I described above happened with both BD players: Sony BDP-S1 BD player and Samsung 1400. Can someone explain taht one to me - I am really at loss here. What gives ?
To summarize though, quality was amazing (identical to us) with both players. We did play like certain scenes from The day after tomorrow" disc 20 times in a row on each player.
Please help restore our sanity
Thanks,
Nikonowski