PS3 setting - whoa! (this may be old news to some, but I just found out.) - High-Def Digest Forums
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Old 05-23-2007, 07:03 PM
Nicodimus22's Avatar
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Default PS3 setting - whoa! (this may be old news to some, but I just found out.)

If this is old news to anyone, I apologize in advance.

I was messing around in my PS3's settings area today, and I went into
the BD/DVD settings. I had already set the optical output to 5.1 upon
setting up the system, but today I noticed another option I hadn't before:
the option of either linear PCM (which is the default setting my PS3 has
been using for the last six months) or Bitstream. Out of curiosity, I changed
it to Bitstream and immediately got a warning message stating that I may
not hear everything during BD playback.

Taken aback, I googled "Linear PCM vs Bitstream" and after reading several
topics on the matter, I concluded that I should have had my PS3 set to
bitstream from day one. I have a Yamaha receiver (the HTR-5890) that I
purchased late last year. Since it doesn't support HDMI, I had hooked up
my PS3 with an optical cable, and assumed that after setting the audio to
optical 5.1 that I was set. Apparantly not.

I am pleased to report that after comparing the same scenes in several BDs,
I noticed much better overall sound quality with the setting on Bitstream
rather than LPCM. This is somewhat of a revelation for me! They didn't
sound BAD before, but there is a pretty distinct improvement with bitstream.

I just wondered why the PS3 instruction manual (or the XMB itself) couldn't
have explained each setting better. From my limited understanding of the
subject, if you're using HDMI for audio (which isn't exactly standard on
most receivers) then LPCM is the preferred setting. If you're using an
optical audio cable to hook your PS3 to your receiver (much more common)
then bitstream will yield better sound.

Just wanted to post this in case anyone else out there hadn't noticed this
setting as well, as it's a pretty remarkable improvement in this case.
Anyone more knowledgeable can feel free to correct my info which was
taken off of various forums.
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Old 05-23-2007, 09:00 PM
Cieljek's Avatar
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i'm using optical to go to logitech z5500's... so should I switch over to bitstream?
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Old 05-23-2007, 09:13 PM
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Yes , I dont think you can get 5.1 without bitstream for movies.
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Old 05-23-2007, 09:14 PM
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It couldn't hurt to try it. Watch one BD scene LPCM, then switch to
bitstream, watch the exact same scene, and see if it sounds better or not.
If you don't like it, switch it back.
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Old 05-24-2007, 10:20 AM
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I think it gives you that warning because by setting it to bitstream your causing the PS3 to send audio directly to the receiver to decode, instead of letting the PS3 do it. Also, to have the signal forwarded, you have to have the TOSS link cable hooked up to the receiver. I also believe the sound quality is limited with the bitstream, but I'm not sure since I use HDMI.
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