Originally Posted by shawnboston
Thanks Bob (and everyone else),
As it turns out, I can't access any of the audio signal processing modes for any audio source (streaming audio, blu ray, etc.) coming out of my PS3. I am going to try a couple of things (dig optical cable, sampling rates) and I will let you know how things turn out. I have the latest PS3 software (2.60) so I'm eliminating that as a solution for now.
Understand that the audio modes you can enable depend upon:
1) The number of speakers you have configured,
2) The type of audio input currently in use, and
3) Whether THX audio post processing is turned on.
For example if you are listening to a 5.1 channel input and only have a 5.1 speaker configuration, then there are no audio modes you can get to (other than THX post processing). The audio modes provide different ways to raise the input to a larger number of speakers for output, so if you only have 5.1 speakers there's no work for them to do when you play a 5.1 channel input.
If you had 7.1 speakers you would find various audio modes available to raise the 5.1 channel input to 7.1 speaker output.
And if you play 2 channel input you will find even more audio modes available for raising that to 5.1 or 7.1 speaker output.
At the other extreme, modes like Mono Academy are only available if THX post processing is turned off. In general, if you think an audio surround mode should be available but it isn't being offered when you cycle through the available modes, try checking whether you have THX turned on.
The charts in the manual go a long way towards explaining this, but you need the extra bit of info that the surround modes are only available when the number of input channels is less than the number of speakers for output since otherwise there is no work for a surround mode to do.
To see what audio modes are available at any moment in time, press Mode once on the remote and then use the Up and Down arrows to cycle through what's available. You can use the Setup > Mode Presets menu for each source device to set the "default" audio mode for each type of audio input coming in from that source.