I'll second that, get a center that matches the rest of your system and hook it to your AV receiver so it gets the same amount of power as the rest of your system. Your center handles abour 85% of the sound when watching TV and movies, don't skimp on it.
I tried this, but you'll run into delay issues with any 480i input (in my case my dvd). It seems the HLP delays the sound to the audio in so the voice will sync up with the picture. Unfortunately this will be off from what's coming from your reciever. Lip Synch on a HT won't help, as you need to have less delay to the center channel, relative to everything else.
I did not have any noticeable problems with 1080i from my STB. It's just that 480i scaling to the native 720P takes longer than 1080i. If your DVD is progressive, maybe it wont be such a problem. I just ran from my center channel out to a RCA Y adapter.
However, as others have stated, it's not a good solution for a center channel. If you like your fronts, just run the center to them, and position them well.
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