So here is the problem. I just recently purchased some tower speakers, they are bic america model dv84. they are wired to a pioneer usx-dso8 receiver. My subwoofer is a polk audio model psw10. The low pass on the subwoofer is set to 100 hz. The volume has no effect. It sounds like the sub isnt getting the right frequencies. Like the speakers are getting all of the low stuff, while the sub is getting hardly nothing except some random higher frequencies, too high for the sub to put out loudly. I just don't get it. Please help.