Upgrade your bassThe Sony HT-A7000 and HT-A5000 sound bars already sound big and powerful, and they even have built-in subwoofers. But what's better than solid low-frequency performance? Even more quality bass, of course! The SA-SW5 has a 7" woofer powered by a built-in 300-watt amplifier and a down-firing passive radiator. The woofer's design maximizes the magnetic force driving the voice coil for deeper, more powerful bass. This subwoofer gives you the extra boom you need to really feel your favorite movies and video games.