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If you seek a real surround sound experience, AC3 and DTS basically mandate that all the channels be full-bandwidth; ie, all the speakers have the same full frequency range. Generally, for a center channel, dialogue will be the central focus, but you don't want to cross different models/manufacturers so that you can timbre-match the drivers. If you absolutely must, see if you can have the manufacturer of whatever component sets you're interested in send you just the raw midbass driver; but you're really better off using the exact same full set for your center channel as your fronts/rears.
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