For instance, I can get DD 5.1 SPDIF to convert to 7.1 with PLIIx with the Yamaha HTR 6090 but I have had zero luck in getting 5.1 MPCM 176 kHz SACDs over HDMI from a PS3 to convert using PLIIx or any of the canned sound field programs.
The manual makes it sound like there shouldn't be a problem in getting the surround backs to fire with any and all 5.1 input.
Depending on your receiver, you may or may not be able to apply PLIIx to all 5.1 sources. For example, I cannot use (on my Pioneer VSX-816) PLIIx for multi-channel analog sources, DTS 96/24 or PCM 96 sources. More expensive (with more powerful CPUs) may have better luck in these situations.
Edit: Ok, so I just re-read your post and realized you're trying to run through the PS3, so basically...nevermind!
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Depends on what you see the "original intention" as being. Was their goal specifically to have you hear all the surround information played back through only 2 speakers? Or did they want the surround field to wrap around you in a seamless arc? If it's the former, then you shouldn't play back 5.1-channel material on anything but a 5.1-speaker set-up. If it's the latter, then 2 surround speakers are going to have difficulty providing envelopment at your sides and behind you simultaneously.
On a properly set up a 5.1-speaker system, sounds that are the same in both surround channels should appear inbetween the 2 surround speakers; usually phantom imaging behind you. But to hear this rear directionality, you have to be sitting right between your surround speakers. If you stretch out on the couch or for whatever reason end up off-centre, that phantom rear image will collapse to the nearest surround speaker.
If you extract those sounds and send them to another pair of surrounds placed behind you, then they will always come from the intended direction, no matter where you're sitting/relaxing when listening to music. Is the fact that those sounds are now being reproduced from a hard source instead of being heard as a phantom image going against the original intention of the recording? If they specifically wanted you to hear those sounds as phantom images, then it is going against their intent. But if they simply wanted you to hear those sounds behind you, then it's not. Who do you ask for confirmation?
The Meridian 861 processor I use has a number of surround algorithms that will 'create' side channel signals from 5.1. I then use an older ADA 6.1 matrixer to extract a rear center channel from the 2 rear channels. REALLY WORKS WELL!
Now if I could only figure out how to generate an overhead channel!
Of course, yamaha's are magic. Phantom speakers rule...sorry had to it makes me giggle.
i7 4770K/16 gig 2133/EVGA 970's SLI 840 PRO SSD
Onkyo 809 40" 4k Seki monitor/Panny AE4000
Paradigm Studio 100/570/20's/2200 Sub
I've asked if anyone is gettting DPLIIx processing on hdmi 5.1 from a PS3 with any brand HTR on a couple of other threads without an answer. Maybe I'll get one here?
I guess I didn't quite uncheck and check every box in the sound menu and thanks to joealtus in the BluRay player forum for telling me what the problem was.