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PS4 Linear PCM: Night and day difference with Dolby Headphone - Page 2

post #16 of 26

So if you have an LPCM signal going into a receiver that has Dolby Headphone...then what is being sent to the headphones?  Is it just the 2.0 signal from the L/R channels (out of the 7 being sent in on LPCM 7/1)?

post #17 of 26
Quote:
Originally Posted by Mad Lust Envy View Post

As far has a GREAT improvement, that's probably because your settings were off. It's the same exact surround algorhythm regardless of signal, so positional accuracy so be 100% identical, unless your settings are all over the place. I assume that you using Bitstream through HDMI was your first mistake, and were most likely only getting processed stereo into fake surround, which is why setting up LPCM for REAL Dolby headphone was a major improvement.

 

Why would Bitstream be a mistake?  Are you saying that the PS4 does a better job of decoding Dolby Digital that his receiver does?

post #18 of 26
Thread Starter 
Quote:
Originally Posted by koticinyourhead View Post
 

Dolby headphones cannot process 7.1 LPCM , let alone 5.1 LPCM.

 

Only when your PS4 audio is selected to "Dolby" or "DTS", does your receiver use Dolby headphones.

Dolby headphones, by definition, takes a 5.1 Dolby Digital (OR SOMETIMES DTS) signal and uses algorithms to reproduce the surround sound thru the two speakers on your headphones. Dolby headphones is notoriously known for producing a "muddy" sound that often lacks definition in the higher frequencies. This also explains why audio directionality isn't matching up with whats on screen. Dolby headphones was built to be used with all types of headphones. Doing this made Dolby headphones a so-so sounding because depending on the headphones your using, you either get really good, or really bad sound directionality. 

 

So to sum up what your receiver is doing when the PS4 is set to these signals: 

 

5.1 or 7.1 LPCM: The receiver takes all the "lossless" audio from the channels, processes it into a stereo signal, and sends it to your headphones. Dolby headphones is not technically being used.

 

Dolby Digital or DTS: Receiver takes all the "lossy" audio from the channels, encodes it in Dolby Headphones, processes it and sends to your headphones. Dolby headphones is being used. But remember, even using Dolby Headphones your receiver still technically mixes it into a stereo signal for your headphones. Headphones cant magically grow more speakers and it is Dolby Headphones algorithms that "can" make it seem like your are listening to a true surround set up.

 

In reality, we only have two ears. The reason LPCM sounds better through you headphones is because it isn't getting muddled up by Dolby Headphones. If there is a way to turn dolby headphones off on the receiver, try that and compare dolby to 5.1 LPCM and they should sound almost identical. The amount of extra information given by lossless LPCM in comparison to lossy Dolby or DTS isn't much when it comes to the human ear. I bet 99% couldn't tell the difference in a blind test. 

 

So the difference your hearing in quality is being caused by DolbyHeadphone. For absolute best quality just grab a nice pair of headphones and use LPCM. I've found that all virtual headphone surround encoders only fudge up the sound. Stereo is all you need for perfect directionality and audio quality with headphones.

 

I dont agree with this.

 

Using LPCM w/ Dolby Headphone I can definitely tell Dolby Headphone is still active vs bypassing DH and using Stereo.

post #19 of 26
Thread Starter 
Quote:
Originally Posted by JakiChan View Post
 

So if you have an LPCM signal going into a receiver that has Dolby Headphone...then what is being sent to the headphones?  Is it just the 2.0 signal from the L/R channels (out of the 7 being sent in on LPCM 7/1)?


Headphones will always get a 2.0 signal, how its processed depends on what signal you feed into Dolby Headphone. Thats pretty much why I made this thread.

 

When I gave my receiver (with Dolby Headphone) a 7.1 LPCM signal, I noticed a huge difference VS giving it a 5.1 Dolby Digital (Dolby Bitstream) signal from the PS4 as I originally posted.

 

Either way, Dolby Headphone was still active, and neither sounded like plain old Stereo.


Edited by rc10mike - 1/9/15 at 7:18pm
post #20 of 26
Quote:
Originally Posted by rc10mike View Post
 


Headphones will always get a 2.0 signal, how its processed depends on what signal you feed into Dolby Headphone. Thats pretty much why I made this thread.

 

When I gave my receiver (with Dolby Headphone) a 7.1 LPCM signal, I noticed a huge difference VS giving it a 5.1 Dolby Digital (Dolby Bitstream) signal from the PS4 as I originally posted.

 

Either way, Dolby Headphone was still active, and neither sounded like plain old Stereo.

 

Ok, yes, headphones are 2.0 by definition.

 

However, if you claim that there's an audible difference between bitstream and LPCM then something else is going on.  Dolby digital decoding is just a mathematical algorithm.  So doing it in the PS4 or the receiver should be no different.  If it is then maybe it's a bug in the receiver.

post #21 of 26

I tried this some more myself and I have to disagree a bit:

 

On my PS4 I switched between LPCM, Bitstream (Dolby) and DTS. I found - and to me this is best audible using the default PS4 menu music - that Bitstream provided the best result, sounding clearer, with more details and more airy than LPCM. I was NOT using my headphones to test this.

 

Might this be simply a result of my AVR not having a "real" surround system connected to it, but rather using a sound bar? I use this Yamaha front surround system that somehow emulates 5.1 or 7.1: 

http://usa.yamaha.com/products/audio-visual/digital-sound-projector/yht-s401_w/

 

Whenever I switch to LPCM my AVR simply shows "PCM". When using Bitstream it shows "Dolby Digital" is active. I am somewhat concerned that this is just a placebo thing, but then again from what I can hear Bitstream (Dolby) simply sounds better...

 

Does this make any sense at all? :)

post #22 of 26
Thread Starter 
You should probably use a Yamaha receiver with Silent Cinema, and headphones next time. I'm not really surprised you didn't hear a difference with that unit and not using headphones.
post #23 of 26
I did hear a difference, only in the other direction.
With headphones and astro mixamp it was sort of the same thing. Bitstream sounded better.
post #24 of 26
Thread Starter 

Update:

 

Im a CoD player. When I originally made this thread, I was playing Ghosts on PS4.

 

Fast forward to now..

 

Now, Im playing AW on PS4. In this game, I cant hear a difference between LPCM and Bitstream Dolby like I could in Ghosts. Im still using the same Marantz DH receiver and headphones.

 

My only conclusion is it must depend on the game.

 

 

post #25 of 26

Maybe try it with the PS4 menu music? Just for a general impression. Do you hear a difference there?

post #26 of 26

I am using Sennheiser HD650 (300 ohm) with a Nuforce Icon HDP amp which is plugged into the USB on my PS4. What audio settings should I use? Linear PCM, Bitstream (Dolby), or Bitstream (DTS)? Thanks!


Edited by Beatitupp - 7/23/15 at 1:20pm
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