Carl powers his system from three AC circuits, each feeding a Furman AC conditioner. The right-hand LED displays show the current drawn from the wall. Carl plays his music loud -- at one point on Jeff's and my auditioning to his system, the Furmans' indicated that 18 amps was being drawn from the wall. It's a good thing the 4 Hafler amps are in a separate room from the speakers as their cooling fans were noisily running flat out.