Sonos Sub Wireless Subwoofer (Wireless, controlled by iPhone, iPad, iPod, Kindle, Android) black, glossy (Electronics)
The sub is super easy to set up (frustration-free packaging!), I took the iPad app of Sonos and had Reconnect only the power and press briefly when you set a button to Sub. Then there's sample tones to calibrate the subs to their own taste, finished.