Onkyo 805 - Multichannel or not?

[darkblueme]

I've had my home theater set-up for just over a month, and I love it! The 805 sounds awesome. I still get goosebumps everytime I hear a movie in DTS HD MA or PCM Uncompressed Audio.

My question is this: Is Multichannel the best way to hear Blu-Rays? I haven't really tried any of the other settings, but last night during the end credits of 'Persepolis' I switched through the various Surround Sound Modes and started to wonder if some of them would enhance the already awesome sound.

There are a couple of "Theater" and "THX Cinema" settings. Do you guys use any of those? I think Pure Audio is a good way to go for concert discs, but I'm still not sure.

What are your thoughts?