I saw a chart once that claimed just over 50% of a movie's sound is directed through the center channel speaker - and I believe it. Dialogue and special effects are often displayed on screen. This is even more true in Dolby Digital than Prologic since the signal and encoding is of a discrete channel. Sixate, your movies will be even better with a center channel. However, it won't have anything to do with your bass. If you have the sub hooked up to the LFE output it is already playing all the bass it will (it sounded like you were concerned about "diluting" the bass).
One caveat though. In terms of using a random speaker for a center channel, please make sure it is magnetically shielded. Otherwise the magnetic fields coming from the speaker WILL damage a tube television. They will cause discolorations and a distorted picture. Ideally your center channel will be made to match your left and right speakers - that way when a sound pans across the room you won't be listening to a full dark sound on the left, then a tinny thin sound in the middle and back to the full sound on the right.
Have fun - surround sound definitely kicks ass!
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