Well some how my frequency sweeps are not going to my mains. The only output I detect is from the subwoofer. I'm at work now so I'll have to wait until I get home to play with it, but I do know that I have my receiver crossover set to 80hz and I still have the SMS-1 crossover set to 80hz. I will turn the SMS-1 crossover off when I get home, but I dont know if that will have any effect on my mains. I guess I can try and turn my sub output down really low or off to see if the mains are producing any sound.