Power your passive Klipsch in-wall subwoofer: Klipsch's RSA-500 makes the perfect companion to the company's RW-5802 II passive in-wall subwoofer - a combination that provides deep, satisfying bass without taking up any floor space. The amp provides 300 watts into 8 ohms when driving one sub, or 500 watts into 4 ohms when you connect a second sub. This amplifier's standard chassis width and attractive aluminum face plate allow it to blend in with your other audio components.