At about 10:30am,this morning, I put on Titan A.E. because I read it had great bass. I had my Yamaha 2095's receiver's volumn knob at -20, and it's subwoofer output at -13 (it goes from -20 to 0) The volumn knob on my SVS 20-39PCi was set a little over half-way. A neighbor knocked on the door complaining she was hearing loud noises and her glasses (drinking I suppose) were vibrating. Keep in mind that I really wasn't playing anywhere near reference level, the sub is on the opposite wall from hers and the apartment walls are concrete. What really amazed me was that even after I turned to volumn down on the receiver and the sub the base was still awsome.