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The ZK-TB21 Bluetooth Subwoofer Audio Amplifier Board delivers a robust 2.1 channel output with 50W per stereo channel and 100W subwoofer power. Featuring Bluetooth 5.0 for stable wireless streaming and AUX input, it offers independent treble and bass adjustments for personalized sound. Designed with advanced chip technology for low noise and AM interference suppression, plus comprehensive protective functions, this compact amplifier board is perfect for DIY speaker projects, parties, and professional audio setups.












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