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Main image of ZK-TB21 Bluetooth Amplifier Board,50W+50W+100W 2.1 Channel Subwoofer Amp Board with Treble and Bass Control,Dual TPA3116D2 Chips Bluetooth5.0 and AUX Inputs,Stereo Digital AMP for DIY Home Speakers

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Alt view image 5 of 7 - ZK-TB21 Bluetooth Amplifier Board,50W+50W+100W 2.1 Channel Subwoofer Amp Board with Treble and Bass Control,Dual TPA3116D2 Chips Bluetooth5.0 and AUX Inputs,Stereo Digital AMP for DIY Home Speakers

Alt view image 6 of 7 - ZK-TB21 Bluetooth Amplifier Board,50W+50W+100W 2.1 Channel Subwoofer Amp Board with Treble and Bass Control,Dual TPA3116D2 Chips Bluetooth5.0 and AUX Inputs,Stereo Digital AMP for DIY Home Speakers

Alt view image 7 of 7 - ZK-TB21 Bluetooth Amplifier Board,50W+50W+100W 2.1 Channel Subwoofer Amp Board with Treble and Bass Control,Dual TPA3116D2 Chips Bluetooth5.0 and AUX Inputs,Stereo Digital AMP for DIY Home Speakers

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ZK-TB21 Bluetooth Amplifier Board,50W+50W+100W 2.1 Channel Subwoofer Amp Board with Treble and Bass Control,Dual TPA3116D2 Chips Bluetooth5.0 and AUX Inputs,Stereo Digital AMP for DIY Home Speakers

Item #: 9SIVRTNKX59536
Mfr. Part #: 474859107975

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Subwoofer Audio Amplifier Board: This ZK-TB21 upgraded power amplifier is 2.1 channel, allows you to connect 2 passive speakers and drive a subwoofer. The upgraded TB21 adds three XH2.54-3P terminals(power amplifier input interface, microphone pre-reverberation transmission interface and return interface). It comes with Treble and Bass buttons for an immersive sound experience
Dual TPA3116D2 HiFi Chip: The ZK-TB21 power amplifier board built in dual TPA3116D2 power amplifier chips, TPA3116D2 is a high performance class D power amplifier chip, which features ultra-high resolution, ultra-low distortion and high fidelity sound quality
50W*2+100W High Power Output: This TB21 audio amplifier has a maximum output power of 50W for the left and right channels, and a maximum output power of 100W for the subwoofer. It can drive two high-power speakers (20 - 200W, 4-8 ohms) and one subwoofer (20 - 100W), and the adapted power supply is DC12 - 24V / 5A or above
Multiple Audio Input Modes: This Min

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ZK-TB21 Bluetooth Amplifier Board, 50W+50W+100W 2.1 Channel Subwoofer Amp Board with Treble and Bass Control, Dual TPA3116D2 Chips Bluetooth 5.0 and AUX Inputs, Stereo Digital AMP for DIY Home Speakers

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First Listed on Newegg	May 17, 2026

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Return for refund within: 30 days
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Item#: 9SIVRTNKX59536