I have R30 fronts, R15 rears, and a CSI20 center. My sub is a 150 watt Pioneer. I don't really understand how the frequency setting works. I'm assuming that it's where you want the sub to start picking up where your speakers can't produce the low sounds. The thing is...the frequency only ranges from 150-50. Shouldn't the range be more like 150-20 so that you can accurately set it at the point that your fronts bottom out? I know that most of you have the RTI70s but I'm hoping that somone knows a good frequency point for the R30 setup.