Hf-028 Hifi Speakers 10.75 Inch Super Woofer Cone Subwoofer Speaker Driver Unit /sw275bd01/02 4ohm 85.5db 8ohm 82.5db - Home Theater Amplifiers - AliExpress
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1600W Bluetooth Audio Power Amplifier, 4.1 Channel Support 2 Pairs Speakers 1 Subwoofer, Wireless HiFi Stereo Amplifier for Home & Car - Walmart.com
Visaton WS-17E 6.5" HiFi Woofer 8 Ohm
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5 /6/8 /10 Inch Super Slim Square Active Speaker Home Theater Bluetooth 12V 110V 220V HiFi Portable Boom Box Bass Subwoofer Audio Speaker Box - China Active Speaker, 5/6/8 Inch Subwoofer | Made-in-China.com