The DaVinci Group Piston 10 In-Wall Subwoofer – The Piston 10 is the latest subwoofer from The DaVinci Group and utilizes a new reverse inverted, long-throw woofer that includes a dual-diaphragm design that is said to take advantage of the outside of the wall to aid its low-frequency extension. Internally the sub features a 10-inch driver, and The DaVinci Group recommends pairing the sub with its Vanguard Dynamics SDA-200 amplifier. tdgaudio.com