Harman Kardon Vintage Silver Subwoofer Model Sub-TS8 For HKTS 8 System | eBay
300w Active High Level Input/out Subwoofer Amplifier Board 8 Inch High Power 1.0 Integrated Hifi Low Pass Filter Subwoofer Board - Home Theater Amplifiers - AliExpress
HKTS 200 | A 2.1-channel home theater speaker system with powered subwoofer
HKTS 2 MkII | 2.1 channel home theater system with 200W subwoofer
INFINITY SUB-TS14 200 Watt 12" Powered Home Theater Subwoofer Working Good Condition | Reverb