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hifi subwoofer passiv, Amazon.com: XRONG Wireless Audio Subwoofer Amplifier, Audio Bluetooth 5.0 Stereo,2.1 Channel Mini Hi-Fi Class D Integrated Amp 100 Watt x2+100 Watt for Home Outdoor Speakers,Powered Subwoofer : Electronics, Fosi Audio M01-BT Bluetooth 5.0 300 Watt Subwoofer Home Theater Full-Frequency Mini Stereo Audio Hi-Fi Power Amp with Bass Gain Control for Passive Subwoofer Speaker Bass Shaker - Walmart.com