Andre, welcome to Axiom, and Happy New Year! My suggestion would be to set all your speakers to "Small"(I assume that you mean that the center is a VP150)with a 80Hz crossover between them and the sub. The frequency control on the back of the PSW125 should be turned all the way up, to get it out of the way of the 80Hz crossover that the AVR-130 is doing.
Hey,
Thanks for the welcome. The centre channel is indeed an Axiom VP-50. I just double checked. It must be something they no longer sell. I have my centre set to 120HZ..my M3's set to 80hz. Does that sound right or should I set my centre to 80hz as well? Thanks again for replying