Pioneer Pro Audio CM-510ST Passive Subwoofer - 10” (Black)These affordable and adaptable new arrivals in the CM Series include a host of features including transformer taps ideal if you need a professional and adaptable fixed installation solution. Rich, punchy bass with low distortion Using the Kelton method*, the CM 510ST filters out unwanted mid and high range frequencies and includes our newly developed Vortex Bass Accelerator technology to deliver pure, smooth bass with a quick response. * The Kelton