Check the listing for details. Klipsch Cinema 400 Subwoofer Amplifier Power Supply Unit Module. Condition: Used. Listed at 89.75 USD. The Klipsch Cinema 400 Subwoofer Amplifier is a powerful accessory designed to enhance your audio experience. As a genuine Klipsch product, it promises top-notch performance and reliability. With dimensions of 6.5 inches in length and 5.5 inches in width, this amplifier is compact yet efficient, making it a great addition to any home audio setup. This amplifier is specifically crafted for the Klipsch Cinema 400 subwoofer, ensuring compatibility and optimal functionality. It's a crucial component for those who appreciate high-fidelity sound and want to take their audio system to the next level. Whether you're setting up a home theater or upgrading your music listening experience, this power supply unit module is an essential investment.