The THE15 SUB PRO ACTIVE SEALED convinces in every aspect, whether in high-profile home theater systems or the editors of renowned worldwide magazines. Awesome performance paired with excellent sound quality dressed in an amazingly compact enclosure - these are the main traits of this successful and award-winning Subwoofer. The custom built 15-inch high-tech woofer is equipped with an extremely strong neodymium magnet and 4" Voice-coil. This motor offers exceptional high acceleration and control with a linear stroke of record-breaking 36mm.