The 110S-UE Ultra-slim subwoofer is a very contemporary, on-wall 4-inch deep cabinet design, thin enough to mount behind a sofa or chair in an outdoor setting. The cabinet is constructed of 5052 marine grade aluminums for long life and ruggedness. Internally, the system features a proprietary James designed high excursion, slim 10-inch woofer with a honeycomb cone and Santoprene™ surround for reliability and the ability to withstand harsh environments. The 110S-UE subwoofer has been tuned to perform from 27Hz to 150Hz. Because it is a high-power passive subwoofer, we recommend pairing it with our M1000 class D amplifier which provides 1000W of clean power and features a full DSP digital processor. Because the 110S-UE is designed as an 8-ohm system, you can power a total of two 110S-UE subwoofers with a single M1000 amplifier.