Built-in wireless receiver offers extreme placement flexibility when used with the included SWT-2 MartinLogan Subwoofer Wireless Transmitter in which case, cable clutter also becomes a moot point High-resolution low-distortion 12-Inch woofer pairs a high-power magnet structure with a 10-inch diaphragm to deliver huge excursion Advanced ultra-efficient 500-watt amplifier uses variable audio tracking power supplies to drive its class AB output stage