Not really. Having surrounds that are different than your mains and center aren't a problem. A long time ago, I considered adding some KPT surrounds but just about everyone said I would not benefit at all from making the switch. The RS-62 II are completely capable of keeping up with the LaScala Trio. The RSW-15's sound awesome with the LaScalas. I only wish they dug below 20Hz. One day, I'll replace them with (4) 18's in an IB (Infinite Baffle) setup or possibly horn loaded subs but horn subs typically don't go down to single digits.