I am using a A&H MixWiz3. I run the kick drum and my bass through the AUX to a crossover than onto a xTi 4000 Crown amp out to the subs. SHould be plenty of power going to the subs. Last drummer had a heavy foot, very hard to control the input gain on the mixer, often clipping the Crown amp. Purchased a compressor, helps some. My problem, the kick always sounds weak through the subs. I am using a pair of EV T-18 for subs. Also I set Aux in post fader mode. My bass sounds good through the subs, nice and loud. But for the life of me, the kick drum is always weak. New drummer, new mikes. Same result at the last gig. Guitarists complains wants to hear the thump of a kick in his chest. I should note I've worked the EQ for the kick per recommendations here and elsewhere as well as the compression settings. Still weak. I am perplexed. If anyone can offer help I would appreciate the early X-mas gift.