I have a Marantz AV7005 receiver and an EP500 from 2006. When I run the Audyssey set up, I am unable to attenuate the EP500 levels. The Marantz shows a -12db subwoofer level (it cannot go any lower). The bass from the EP500 is just too over powering in bass heavy movies and certain DirecTV channels, such as CNN and NatGeo. It sounds way too "boomy". I've tried leaving the EP500 gain setting to the 9 o'clock setting and even at its most minimal setting before the Audyssey set up. I've tried it with the subwoofer set at FLAT and FULL trim. I get the same results. Ideally, I would like to set it so that the Marantz shows a 0 db level so that I can lower and raise the SW level as needed. I had the same issue with my Yamaha RX-V2600 receiver. I've even tried moving my sub to different parts of the room (away from corners) and still cannot attenuate the bass. Any suggestions? Something I'm missing here?