I just acquired a Definitive Technology PF15TL+ sub. For $700 list, I am truly amazed. This baby sports a 500w amp and 15" woofer - a vast speed improvement over the PF15TL version. I cranked up No Mystery by Return To Forever, and my neighbor was rendered impotent for three days(?). Honestly, after auditioning B&W, Phase Tech, and Velodyne, I was sold on the Def Tech for sound vs. value. GOOD LUCK!