I have 3 10" MTX Thunder 5500 subs in a ported SledgeHammer enclosure. Well they get really loud and hit even with the volume on zero, the hu subwoofer level on zero, and the bass knob on zero. I also turned the gain all the way down to make it quieter. I would like to turn the gain up to really push these guys when I want to but most of the time I don't want them so loud. Is there a switch or a knob that I can install that will completely turn the subs off? Or cut power to the amp? Something. Any help is appreciated. Thanks guys.