I've been playing my friend's Peavey Firebass head (450 watts at 4 ohms) into my new Genz Benz 610T-XB2. I also have been using my Boss EQ pedal. I usually like extreme settings, such as bass up all the way, treble up 3/4 of the way, scooped mids. I noticed the speaker cones were booming. So I turned the EQ pedal down a bit, and its still doing it a bit. So I turned the bass down to 3/4, treble to 1/2. The gain is on 2, and volume on 4. So does it sound like there is something defective with my cab? Because 450 watts, into a 900 watt cab, pushing the speakers, and the head is not even clipping.