also I tried setting the crossover in the sms to 60 and left my reciever at 80 seemto smooth things out for me, I was worried about noise or low output because that is what it says in the manual I also adjusted the phase on the subs I have a volume type phase, I set one to 180 and one to about 40 and it brought up some of the dips boy there so much you can do be it bring up the volume, change crossovers etc. having lots of fun playing though.