The Q Acoustics 7070Si is a compact and stylish subwoofer. Ideal for smaller AV systems, desktop audio or as a lifestyle system, the 7070Si packs an incredible punch for its size. Is your speaker or home cinema system lacking bass? The 7070Si may be just the trick to add the punch to your movies and music. Featuring a powerful 150W Class D amplifier, the 8 inch (200mm) driver is capable of producing rich, thunderous bass, and thanks to the revolutionary 'Internal Firing' design principle, the 7070Si will sound superb wherever you position it.