Sony SA-SW3 6.3" 200W Wireless Subwoofer for HT-A9/3000/5000/7000 For HT-A9 Home Theater System, For HT-A3000/5000/7000 Soundbars, 6.3" Woofer, 200W of Power, Digital Amplification, Separated Notch Edge Technology HOME ENTERTAINMENT-Subwoofers