Here's my setup: Denon 2802, JBL S412p(mains no LFE), JBL L-1(center), JBL S38's(rears), and my newly built Tempest driven Sonosub tuned to 16.5hz(18" Sonotube x 66" length x 6" x 26" port) driven by a Technics DPL receiver. Set up into 8ohms. My set-up is down in my family room(14'x25'7.5"). I am getting such huge low-end bass in the upstairs. It "feels" so much better upstairs than downstairs. Can anyone expalin why and how to get the extreme "low-end" back downstairs where I want it. Now I do have the setup on the width end, will I get better performance if I go lengthwise?