This problem should not happen with any decent center speaker. If you are going to stick with this system get a third speaker the same as your mains as one person suggested. Otherwise go with another system. I have the Revel Voice center and it take whatever is thrown at it. It uses much of the same drivers as the mains.
What is best center speaker?
I have an HT set up with bryston 4b amps (4 ) an AV 9000 marantz a 65in HDTV and Piega P10 as fronts Piega P5 as back and the Piega Center. I have now blown the center twice and am tired of sending it back east to be fixed. I need a center that will fit in with the Piega and will take 200 to 400 watts and sound outstanding. Does a center like this exist? (The Piega center is a wimp)Thanks for your input.