Bluetooth 5.1 Audio Amplifier Board, ZK-AS21 2.1 CH 220W x 2 + 350W HiFi Subwoofer Power Amp Mini Digital Audio Amp Module for Home Speakers(30-220W, 3-8Ohms), DC 16-38V, BT USB AUX Input

2.1 CH Subwoofer Audio Amplifier Board: This 2.1-channel power amplifier enables connection of 2 passive speakers and a subwoofer. It provides Treble and Bass adjustment knobs, separate subwoofer volume control, and 20-200Hz subwoofer frequency adjustment, offering flexible control for audio enthusiasts to boost bass impact, treble clarity, and overall sound layering. 220W*2 + 350W High Power Output: This audio amplifier supplies 220W*2 output power for the left and right channels and 350W for the subwoofer. It can power two high-power speakers (30-220W, 3-8 ohms) and one subwoofer (30-350W, 2-8 ohms). The suggested power supply is DC16-38V/10A or higher. Note: Greater power supply voltage/current raises output power, and lower speaker impedance also raises output power. The power supply should surpass the amplifier's actual working power. HIFI Audio Power Amplifier: The power amplifier board integrates two TPA3255 high-performance Class D amplifier chips, achieving ultra-low distortion across the full audio frequency range and providing high-definition sound. The wiring around the chip uses a window tin spraying design to boost output power. It also contains 6 low-noise 5532 preamplifier groups to enhance sound quality, volume, and gain. Multiple Audio Input Modes: This compact amplifier receiver includes built-in Bluetooth 5.1, USB flash drive playback, USB sound card function, and a 3.5mm AUX input. Bluetooth 5.1 provides faster transmission, lossless decoding, lower distortion, and a connection distance up to 15m/49ft. Note: When using AUX mode, ensure the Bluetooth connection is off. Protective Functions: This amplifier module incorporates multiple protection features, including over-voltage, under-voltage, over-heat, and short-circuit protection, and includes a protective case. Also, a robust ultra-silent fan (featuring locked rotor protection, no burning, and minimal noise) is mounted above the audio chips for efficient heat dissipation and board safeguarding