While listening to some music this past weekend, I was going through my receiver manual. Mainly to lock my receiver so my teenagers would not blast the music while I was not at home. I realized that my speaker settings were set to small. I changed the setting to large, it made a noticeable improvement in the bass department. I now have moved my subwoofer to the rear of the room, and have adjusted its gain way down to about 2. my room still shakes when I play Kid Rock for my BullMastiff, she likes Kid Rock for some reason. Moving my "sub to the rear of the room has improved the Bass response, and gives the room a more filled in feeling.