i just bought 4 rti38 ,1 csi30 and a psw 404 sub. love the system but my sub dose not seem to be able to handle to amps power. my receiver has a lfe output that i run around 80 to 100 hz. AT low volume the psw plays great. but when played at half volume it distorts and pops. the psw volume is at half also. my receiver is an onkyo tx rx-600. IS this typical of this sub or am i a bass hog?