No they won't overpower your mains or sub. Just calibrate them with a sound meter. Radio Shack is rolling out their new analog model, part # 33-4050, $40. Check it out here.

Jason


M80 HP v4, VP160 v4, QS8 v1 (3 in 6.1 layout), SVS PB12-Plus/2, Parasound Halo A21, Denon AVR-X4100W