The Yamaha KS-SW100 is a compact subwoofer for keyboard instruments that incorporates a variety of advanced, high-performance bass technologies including a Twisted Flare Port and Advanced YST II (Yamaha Active Servo Technology II), resulting in a clear bass response. The 100W amplifier drives the 8' woofer, which outputs a frequency response of 28 to 200 Hz. The Yamaha KS-SW100 ships with a 1/4' to RCA cable.