Okay, that hdmi on the A1 is not 1.3 so you can not pass 7.1 channels thru. The PS3 does decode DolbyTrueHD -- all 7.1 channels if available and they are currently working on decoding DTSMasterHD -- the target date is March 08 according to the studio that does DTS. The PS3 is a pretty nice product no matter what the boobirds say.
Here you go again.

Q. Do I need v1.3 HDMI to hear the new Dolby TrueHD and DTS Master HD audio content on HD-DVD or Blu-ray players?
No. The Dolby TrueHD, Dolby Digital Plus, and DTS-HD Master Audio can be decoded by the playback device into multi-channel Pulse Code Modulation (PCM) digital audio streams, which is an audio format standard that can be sent over any version of HDMI. In fact, all versions of HDMI can support up to 8 channels of PCM audio at 192kHz, 24 bits per sample.
S~
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