Paradigm S4 Quicksilver amplification

I recently inherited a pair of Quicksilver mono blocks and on the advice of a respected dealer picked up a new pair of Paradigm S4's. Unfortunately it is clear that it was poor advice as the speakers sound like they have a towel draped in front. I would like to use the Quicksilvers for sentimental reasons and am thinking of using them for the higher end in concert with a matched amp for the base drivers. Is this practical? If so, any suggestions on which amps I could pair the Quicksilvers with? Many thanks