Originally Posted by jibjab
I am sure this has been answered before, but I can't find anything from the search bar, so if someone could just answer my question and let this post fall into oblivion, I'd be much obliged.
My question is, I have an Onkyo TX-SR805 and a Toshiba HD-A3. When I decode 5.1 tracks in the A3 and send the LCPM to the Onkyo, is there a way to matrix it to 6.1 while retaining the SQ?
Thanks in advance.
Putting aside the local pissing contest, here's a brief explanation. There really aren't any HD discs that have 6:1 encoding. The 805 is fully capable of matrixing 7:1 from the 5:1 MPCM, and it will sound terrific. I personally prefer to use the PLIIx decoder. Assuming appropriate speaker placement, it should give you a "deeper" sound field to the rear. No, it does not degrade the audio quality. In fact, it does nothing at all to the 5 channels, it only ADDS 2 more channels. Repeat, it does absolutely nothing to the 5:1 channels, it doesn't even "remove" anything from the side surrounds, it only ADDS the rear 2 channels, using sounds that are present in the sides. If your system is properly set up and calibrated, you will be only barely aware of the 2 rears, but you will perceive greater depth to the rear.
Now, on SD-DVDs that DO have ES/EX encoding, the ES/EX flag will not be sent by the A3 over MPCM, it may or may not be present over bitstream. Some ES/EX discs don't even have the flag to start with. So again, it's usually best to verify whether the flag is present and use the 805 decoders appropriately. Even if the flag is not there, the audio is the same, so decoding will reproduce the sounds as they were intended.
Hope this helps.