I have been using my RT15i's as mains for a simple 2-channel setup. My receiver is a (*cough*) older model Sony. For music, the sound is superb. But when Jango Fett sets off siesmic charges, the RT15i's buzz like they're blown. Go back to music (even hard rock with pounding bass) and the sound is clear and clean. ???? I suspect that adding a powered sub with a low-pass filter will take 'the heat' off the RT15i's so DVD action and explosions will be distortion free. Any thoughts?