My AV-3 mains are overpowering my AV-3S center channel. I have the center at +10db on my receiver but sometimes I have trouble hearing dialog on 5 channel material. All 3 speakers are working on the AV-3S and the wiring checked out OK. Is it possible that there is something in the crossover that is reducing the output? I have a H/K 225 receiver and I have tried small/large/none options. It sounds better with the no center channel setting.