Amazon.com: Polk Audio PSW505 12" Powered Subwoofer - Deep Bass Impact & Distortion-Free Sound, Up to 460 Watts, Easy Integration with Home Theater Systems, BLACK : Electronics
Best Buy: velodyne Impact Subwoofer System White Mini
Sonance Impact Piano Black 8" Subwoofer - 93356 | Abt
AUDIO PRO SUB IMPACT SUBWOOFER SPECIFICATIONS | ManualsLib
IMPACTMINI65INCHSUBWOOFER in by Velodyne in Tulsa, OK - Impact-Mini 6.5 Inch Subwoofer
Wharfedale Pro Impact-X218B Dual 18" Passive Subwoofer at Gear4music
Impact Subwoofers by Sonance | dmg Martinez Group
Subgrade today, going from Velodyne Impact 10 to Velodyne Impact 12. I got the 10 for $80 and the 12 for $300 : r/BudgetAudiophile