Axiom Home Page Forums General Discussion Stereo Problems with EP350 rattling

air escaping can give this sound, had that issue once so snugging up the fasteners is worth a shot. Also, internal rattling of wire connections at certain frequencies is a possibility. Have you run calibration with the Denon? You would normally put the crossover on the sub on the highest setting and let the receiver handle the bass management. do you have an SPL sound meter you can run test and see if it is calibrated to your other speakers.