Official SVS Ultra 13 thread - Page 30 - AVS Forum Jtimmmy, to improve the bass beyond what you have, you need to do one of three things:1. Buy a second PB13Ultra. I have two in a very leaky (two double door size openings) 2600 cubic foot room. Four benefits: 1. Lower cone movements loweres distortion and allows better recovery of inner detail simultaneous with loud sounds. 2. If non-colocated (one on each side in front), evening out of room resonance patterns. 3. Ability to use lower tunes and still have enough output (several including myself think the 10Hz tune sounds the best if you have enough output) 4. Ability to play tracks like Pulse that are hard on subs at higher levels. I know this option sounds like overkill, but I don't know anyone who has gone to duals who has ever gone back.2. Buy EQ. By GollyJerin Public bookmarkswith audiohome_theatersound