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Need surround sound help

I have a 5.1 system from RCA right now, it's 600w and has DTS, Dolby Digital, and DPLII. It works well and I like it (it could use better speakers i'll admit), but I'm reading all kinds of stuff about HD sound (DTS-HD, Dolby TruSurround, and some others). My question is what's the difference? Does HD sound sound better? Is it just gonna be more channels like 7.1 or something? Am I gonna wish I had this when watching HD movies or playing next-gen games? I already plan on buying a Wii, a 360, and an HDTV (when the TV prices drop more) this year plus a PS3 hopefully early in 2008. I can't see myself dropping money on a new sound system for a LONG time but this HD sound business is sounding like I'm gonna wish I would.

O and on a side note, the way I have my system set up is the video goes directly to the TV and the audio goes directly to the A/V receiver through an optical cable (as opposed to the video running through the A/V receiver with the sound and then to the TV). I've heard this can cause the audio to be out of sync with the video, I've never had this problem but do you think there's a chance I might with other things in the future?

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"stuff about HD sound (DTS-HD, Dolby TruSurround, "

In reply to: Need surround sound help

This will be on HD-DVD/B-Ray DVDs and ONLY via HDMI!!!
Until your ready to buy one of the above don't worry about it.
You also need a new AV receiver that has HDMI inputs and outputs. John

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also...

In reply to: Need surround sound help

About routing through an a/v system and video being out of synch with audio, some receivers (I have a denon 3805) allows you to delay sound to synch with video, or vice versa? Regardless this can be adjusted and its nice being able to switch devices with 1 action through your a/v system.

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