Ok here is my setup I use a sm57 into a mixer for my vocals and stand behind the speakers if I turn the volume to 1 1/2(which isn't enough volume) and have treble or mid at 0 cause if I turn it past zero I have a storm of feedback. keep in mind I play in a 24' by 28' wood walled concrete floored room I have a couple rugs on the floor to try to keep the floor reverberations to a minimum. but I would like to be able to turn up the treble to atleast five and maybe some mid. Any Suggestions? it is killing our practices!