KLH KSUB-10 active subwoofer for sale. This 10-inch HD sub will rock your house with its 30Hz ~ 180Hz variable frequency response and 120 watts of power. Sports a nice 10-inch long-throw driver that’s matched to a high current amplifier. The dual 4-inch rear-firing bass reflex ports stifle unwanted noise and improve low frequency sound reproduction, so you hear deep strong bass from music and movies. Can be connected via Low Level or High Level inputs/outputs. There are individual Gain and Frequency controls, as well as a Phase switch, and a optional auto-power-on mode switch (please see picture #6 for clarification). The black matt design will seamlessly complement most home entertainment system. The dimensions are approximately 17 by 14 by 16-inches tall. Used, but in good working condition.