Join Date: Sep 2007
Location: Mississauga, Canada
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You're pretty much SOL - the HT system you bought is primarily meant to be used to play DVDs/CDs/USB content internally via the player itself, thus, it's additional input capabilities are extremely limited. Ideally, what you would do is connect both video and audio of all your devices to the TV. Then, use a TV's analog audio output (stereo RCA) to feed a two channel signal to the HT box. You would then select the TV/cable input on the HT remote. However, your TV does not have an analog RCA output, so the above setup option becomes moot.
The only choice you have left is to connect analog RCA cables from the devices themselves directly to the HT box's RCA input, in which case, you can only connect one at a time (or buy an anolog switch box/selector to accommodate two). Keep in mind that even with this setup, you will be getting at best two channel audio up-mixed to 5.1 via Pro-Logic, not true 5.1 surround.
The ideal solution IMO is to upgrade your HT box.