Hello all, I'm seeking to clarify some information regarding setting the subwoofer low-cut crossover settings so as to get along with my mains in the best sounding way possible. I just purchased a pair of Klipsch SF-2 mains for my home theater setup. I own a Def. Tech ProSub 80 subwoofer, nice little box of 250 watts. Now, I looked at the specs for my speakers and their freq. response is 35Hz-20kHz±3dB. The response range for the sub is 21-150Hz. Low Pass Crossover: 24 dB/octave continuously variable (40-100 Hz) The way I have it setup now is I have the mains set to LARGE in the receiver setup, and have the subs crossover bottomed out at 40. My understanding is that you only want to set the crossover a little above the mains minimum reproducible frequency. Is this the correct line of thinking? I've also been advised to set all speakers to small and then turn the low-cut up to 100 or so. Any opinions on this are welcome also. I only got the speakers yesterday, so I have not had too much time to tweak, listen and retweak. I just wanted to get some opinions here while I am at work. I do understand the fact that tweaking and trial and error will also help me determine the best settings. Thanks in advance for any input on this matter.