I have a sony amp which i use for 5.1 and dts,i also use it for skyhd for a optical switcher,i had no problem with my ps3 until i swapped from composite red blue cable to full hdmi.
Now when i use my amp the sound is garbled,i have tried every ps3 setting under the sun,but there are 2 boxes that are ticked that cannot be removed.
on optical settings,i think the sound from hdmi is being carried and is garbling my sony amp,and i have tried several tvs same problem,my skyhd 5.1 works fine,just my ps3 hdmi sound is nogoood,and i have to turn ps3 off to use skyhd via a switcher.
PS3 is The amazing device by sony but it has some common problems like
sound, but no picture problem etc.... Good news is that these all
problems can be repaired with the help of DIY Guides, one such guide
available at PS3 Repair Blog
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Here's an easy way to fix this. Go into your audio settings in your settings menu. Find where your settings for Dolby 5.1 are, you'll see a bunch of check mark boxes and some check marks. You will need to un-check the DTS (or very similar) at the bottom of this list. let it go through and you should be good to go. Make sure your output is on the correct settings - i.e. if you're using fiber optic cable make sure it's on optical, if HDMI put it on that setting. The DTS is the thing that is 99% of the time the exact problem.
To output Dolby Digital or DTS audio, you must connect the PS3™ system
and the audio device using a digital optical cable and switch to
[Digital Out (Optical)] under [Audio Output Settings]. Good Luck.
Connect the HDMI cable from your PS3 to your T.V. for video, and
connect your optical audio cable to your Home Theater. Hold your finger
on the on/off switch of the Playstation for 5 to 10 seconds,you will
have flashing blue and green lights while you hold it, then it will
turn off (red). Then hold it again for another 5 or 10 secondsto turn
it back on, keep holding it until the green and blue lights stop
flashing. That resets the Playstation3 defaults. If you have an HDMI
cable, you will see a message "HDMI cable detected, do you want to
select it?" Say yes. Then you should get a second message about "Ps3
can automatically set optimal settings, yes or no" Again say yes. Now
you should have audio and video through your T.V. Now to get the audio
through your home theater, go to "system settings" (looks like a
suitcase.) select sound settings...the PS3 should have selected HDMI
already, change it to digital optical, and then move right to the
optical settings, put a check mark in "Dolby Digital", and "PCM 44
mhz", and "48 mhz.." DO NOT...and I repeat DO NOT put a check mark in
"DTS digital" If there is one there, uncheck it. That is what is
screwing everybody up, that is a movie sound setting usually only found
on high end music concert DVDs (like the Eagles) you will get no sound
on some games and some regular movie DVDs with this setting selected.
Move your screen right once more with your left joystick...click "save"
and Voila!! Go start the game.
You will need to tell the PS3 to use the optical cable for digital output in its setup, as well as tell your amp to use the optical cable as the input for whichever 'source' you wish to have associated with the PS3.
Check your pioneer unit settings, the ps3 settings are correct, and make sure you unplugged the audio cables. It sounds like a bad signal somewhere, which would cause the speakers to clip and distort. Make sure all of your surround sound speakers have a good connection if they have single wire runs to them and not a audio plug in them and there are not broken wires, or wires touching.
If your marantz amp is part of a home cinema system then depending how old it is will depend on if it will do it automatically.I have just bought a sony surround system and it detects the signal range ie it knows it is being transmitted in 5:1 surround.If you have an old system you may have to do this manually, this should not be diffecult there should be a sound setting.
Your amplifier should "downgrade" the signal to 5.1, even if the disc isn't using it. It is most likely a setting on your amp that may need adjusting for "types" of digital to accept on its input. If you can, set your optical input on your amp to "auto". This way it will automatically detect and switch for the proper incoming audio feed