200 watt active subwoofer amplifier kit with power supply
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TPA3116D2 50W x 2+100W 2.1 Channel Digital Audio Power Amplifier AMP Subwoofer
SB34 12" Subwoofer Kit with SpeakerPower Amp
2.1 Channel Subwoofer Power Amplifier Module DIY Kit 50Wx2+100W Treble Bass Control DC 12-24V BT Audio Amplifier Board Stereo Speaker Digital Amp for Audio System - Walmart.com
2.1 Home Theater Kit Board Amplifier Circuit with Bass Boost and Treble Support TDA2030 Based with Connecting Wires and Volume, Bass, Treble Controllers - SmartBuy365