Hey that would work right? If you just need to buy the center channel, the new sub with amp, the new control module and maybe some wiring, it could all be setup. How much would Klipsch charge for this? If they charged $200-$250 it would be reasonable I think. You've already spent $250-$300 on your 4.1 system. If you got the new set, that would be like a $550 investment!!! A pretty good ammount to give to the company.
An even better gift to their devoted customers would be some kind of Y-cable diagram setup to use the old 4.1 sub in conjunction to make a 5.2 system. AND!!! if possible, a bridged mode for the amps to power the sats. WOW...900watts+
Amy, run this by the tech guys or some boss.