More on Amazon.com : http://www.amazon.com/gp/product/B0002YUMY8?tag=purrfectcatdi-20 <br /> <br />Dayton Audio SA25 25W Subwoofer Amplifier <br /> <br />Line-level and speaker-level inputs for connection to any system <br />Variable 2nd order low-pass crossover from 60 Hz - 180 Hz <br />Speaker relay prevents turn-off thumps
