Need big sound, slamming bass, and audiophile bass extension, but don’t want to see where it comes from? Then the ISW-4 in-wall subwoofer is the product for you. Its two long-throw 200mm drivers allow the ISW-4 to move large volumes of air needed for high-quality low-frequency output but is nicely hidden away inside a wall. Powered by a separate audiophile standard 250W Class D amplifier the CDA-4D, the system keeps its cool even when the music movie action is whipping up a storm.