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

This AS-21 power amplifier features a 2.1-channel design, enabling connection of 2 passive speakers and a subwoofer. It is equipped with Treble and Bass adjustment buttons, separate subwoofer volume control, and 20-200Hz subwoofer frequency adjustment knobs, offering a convenient experience for audio enthusiasts. Adjust the Treble and Bass to make the bass more powerful and the treble more distinct, producing a more detailed sound. This AS-21 audio amplifier provides 220W*2 output power for the left and right channels and 350W output power for the subwoofer. It can drive two high-power speakers (30-220W, 3-8 ohms) and one subwoofer (30-350W, 2-8 ohms). The suitable power supply is DC16-38V/10A or higher. Note: A higher power supply voltage/current yields higher output power. Lower speaker resistance also boosts output power. The power supply should have a higher rating than the amplifier's actual operating power. The power amplifier board integrates two TPA3255 power amplifier chips. The TPA3255 is a high-performance Class D power amplifier chip, allowing the device to maintain very low distortion across the full audio frequency range while delivering high-fidelity sound quality. The wiring around the chip uses a window tin-spraying design to increase output power. 6 low-noise preamplifiers (5532 group) enhance sound quality, volume, and gain. This compact amplifier receiver includes built-in Bluetooth 5.1, USB flash drive playback, USB sound card, and 3.5mm AUX input. Bluetooth 5.1 mode provides faster transmission speed, lossless decoding, and a reduced distortion rate, with a connection range of up to 15m/49ft to audio equipment. Note: When using AUX mode, ensure the Bluetooth connection on this module is turned off. This Bluetooth amplifier module incorporates multiple protection functions, including over-voltage, under-voltage, over-heat, and short-circuit protection, and includes a protective case. Furthermore, a robust ultra-silent fan (featuring locked rotor protection, no burning, no noise) is mounted above the audio chips for cooling and safeguarding the amplifier board