I have a PS3 which I primarily bought for BluRay, with the advantage it was for gaming as well. The one box for both requirements.

I have a Pioneer VSX D906S surround sound system. I got it Saudi probably 1998. Up until the advent of Bluray I've had no problems. All DVDs have played perfectly with superb 5.1 audio. For that reason I've seen no reason to replace it. The output goes to a Bose surround sound system.

Now, some Bluray DVDs we've purchased do not seem to play 5.1 on the main feature film. They play in Dolby Pro Logic. I can see when it's true DD playing as the front panel on the receiver has a series of lights for each of the satellite speakers and another for the deep bass effects.

Strangely enough the trailers preceding the main film DO play in 5.1. It's just that as soon as the main film cuts in it swaps to Pro Logic. And it doesn't appear to be all BluRay DVDs either that I'm having the problem with.

The connection is an optical cable to the receiver direct from the PS3.

As an example we cannot hear Quantum of Solace in 5.1.

Is it because some Bluray DVDs are sending a different audio signal than others and that my receiver is unable to decode that signal. Is it some combination of audio settings on the PS3. I have tried various already I should point out, but admit I don't the techie stuff on this enough.

HELP, if anyone knows the answer, even if it really is that I need to update the system. If that's what is necessary then I guess I'll have to bite the bullet, but don't want to if I don't have to. I'm happy with the system I have as long as it works with Bluray.

Does your receiver have a DTS decoder? Quantum of Solace has a dts-MA track. The previews on most discs are done in DD 5.1, even when the movie itself has a DTS or 5.1 PCM track. Also, are you bitstreaming both DD and DTS to your receiver for decoding?

Your receiver does not decode DTS. Luckily you have connected the PS3 to your receiver optimally. The only step you'll need to do is whenever you encounter a DTS only BluRay is while the movie is playing to press triangle on the controller, choose audio/video settings and changed audio output from bitstream to PCM.

The PS3 will decode DTS and output 2 channel PCM via optical to your receiver. I believe it also preserves the surround information and put it out-of-phase in the 2 channel stereo. If you set your receiver to 'Dolby Surround' or whatever setting it calls it, the receiver will extract the out-of-phase surround info and you'll be able to get some old fashioned Dolby Pro-Logic surround.

The receiver does indeed not seem to have anything for DTS. The bitstreaming bit is where you lose me. I work in computer software development and its enough to keep up with that without adding in the need to become an audio expert. I really have no idea what bitstreaming is. I have tried various PS3 settings regarding audio. There is a setting I believe that includes DTS, but if I recall when I set it ON I got no sound at all. Seems to me that I'm doomed.

I don't have the setting names memorized, but in the audio setup where you check/uncheck the different options for SPDIF have only: Dolby/44/48k checked. uncheck the DTS box.

then when you play the DTS movie, press triangle on the controller and find the audio/video setting. It is different from the above SPDIF audio settings menu. In that menu while the movie is playing you'll find the switch for bitstream/PCM. You can also default it to PCM in a different menu area, but again, I don't have it memorized.

The receiver does indeed not seem to have anything for DTS. The bitstreaming bit is where you lose me...I really have no idea what bitstreaming is...

Think of the DTS audio as a zip file. If you bitstream the audio to your receiver, you're telling the PS3 to send the zip file to the receiver, and the receiver will need to unpack the audio.

If you tell the PS3 to send the audio as PCM, the PS3 unpacks the zip file and sends the audio file to the receiver.

Either way, the exact same bits get sent to the receiver's DSPs for processing.

The problem you have here is that your receiver doesn't know how to unpack the zip file (DTS audio), so you have to have the PS3 unpack (decode) it and send it on to the receiver (send as PCM instead of bitstream).

Think of the DTS audio as a zip file. If you bitstream the audio to your receiver, you're telling the PS3 to send the zip file to the receiver, and the receiver will need to unpack the audio.

If you tell the PS3 to send the audio as PCM, the PS3 unpacks the zip file and sends the audio file to the receiver.

Either way, the exact same bits get sent to the receiver's DSPs for processing.

The problem you have here is that your receiver doesn't know how to unpack the zip file (DTS audio), so you have to have the PS3 unpack (decode) it and send it on to the receiver (send as PCM instead of bitstream).He can only pass 2-channel PCM to his receiver.