Originally Posted by heislord5
The signal limitation on the PS3 is a real limitation. I'm not saying it is significant, but it is more than just in a person's head. There is no way with the PS3 to get the HD signals and then use the receiver's listening mode configurations to do different things for different types of signals.
Since the PS3 won't send the original signal as DTS HD Master Audio or as Dolby TrueHD, then I have no way of treating them differently.
I would like to send an unaltered DTS HD Master Audio signal (no post processing) for my "Bolt" movie that already has 7.1.
For my "Iron Man" which is only 5.1 Dolby HD, I would like to upconvert is using my receiver's post processing options, like "THX Select2"
I don't know how these post processors work. But if I want 7.1 with "Iron Man" and if I want to HD audio, then I have to set PS3 to PCM and I have to use one of the post-processing options for ALL my audio coming from the PS3.
That means when I pop in my "Bolt" cd 2 hours later, it is going to go through the "THX Select2" post-processing, even though the source is already 7.1 and is already HD.
If the PS3 would correctly recognize the signals and send them to the receiver as what they really are. I could use the receiver's settings to do the "THX Select2" post-processing only to the Dolby HD audio and the I could select the Correct setting for the DTS HD Master Audio to be processed as "Master Audio". Better yet, for the Dolby HD 5.1, I could choose to process it as "Dolby EX" which would upconvert it to 7.1
The idea of using different upconverters/signal-processors for different signal types is exactly why the receiver has all these options in the first place. This flexibility is taken away from you when you use PCM on the PS3.
Now maybe it doesn't matter in the end with regard to sound quality, but if it didn't matter at all, why would these options be available on the receiver in the first place?
Anyway I set to PCM and set post-processor to one that converts to 7.1, can't remember which one I settled on. I now get 7.1 for all movies. But is 7.1 "Bolt" run through "THX Select2" post processing as good as 7.1 "Bolt" with only the original DTS HD Master Audio decoding done? I don't know. But I don't have the option of listening to unaltered Bolt audio without sacrificing my 5.1-7.1 upconversion for other cds. The only reason I don't have this option is because the PS3 will not send the HD audio to the receiver as unprocessed HD audio.
You are, unfortunately, correct. You DO NOT understand how post processing works. It is very simple.
All post processing is applied AFTER the audio is converted to LPCM, either 5.1 or 7.1 channels. It is irrelevant WHERE the signal is converted. A Blu-Ray player (ANY Blu-Ray player) can be set to either bitstream or LPCM output depending on its internal processing capabilities. The receiver then accepts either a bitstream which the receiver converts into LPCM internally or it accepts the external sourced LPCM. Post processing is then applied to that LPCM signal.
Now if you are using DPLIIX (my choice) for creating 7.1 channels from 2.1 or 5.1 sources and you feed the receiver a 5.1 channel bitstream, the receiver will convert the bitstream into 5.1 channels of LPCM. Then and only then is DPLIIX applied to create the additional 2 back surround channels. If you feed the receiver LPCM straight out of the Blu-Ray player, DPLIIX will do the same thing.
Now, if you feed the receiver a 7.1 channel bitstream, the receiver will convert it to 7.1 channels of LPCM. DPLIIX will see 7.1 discrete channels of LPCM and WILL NOT do any post processing. Same thing if you feed it 7.1 channels of LPCM straight from the Blu-Ray player. DPLIIX will do NOTHING to a 7.1 channel signal.
You can see this happening on the front panel of the 706. If you have a 7.1 speaker setup, you will see 8 boxes on the front panel representing the 8 speakers (including the sub). If you feed a 5.1 channel signal to the receiver (it does not matter if it is bitstream or LPCM), and have DPLIIX turned on, you will see 6 boxes with speaker names in them and 2 without. You will see either LPCM or whatever flavor DD or DTS you are feeding the receiver. You will also see DPLIIX indicated.
Now, if you feed the receiver a 7.1 source, either LPCM or DD TrueHD or DTS HD-MA, you will see that source indicated on the front panel and 8 boxes with speaker names in them. You WILL NOT see DPLIIX indicated, even if it is set as an audio preset because it is not being invoked.
So, what do you do? Set up the receiver audio presets to DPLIIX for LPCM, DD and DTS (lossy or lossless, it does not matter), sit back and enjoy 7.1 channels of surround sound. If the source is 7.1 discrete, you will get 7.1 discrete. If the source is 5.1 discrete, you will get 5.1 discrete channels and 2 matrixed channels. If it is 2.1 discrete channels, you will get 2.1 discrete channels and 5 matrixed channels.
By the way, DPLIIX will create stereo back surround channels where as THX Select 2 Cinema creates only a mono back surround channel fed to both back surround speakers, as does DD Ex.
As a final note, Audyssey is also applied to the final LPCM audio and not to the bitstream.
Hope this helps.