<p>1. Adopting high-power digital power amplifier dedicated inductors, high current, low magnetic loss, low heat generation, and using oxygen free copper wires to improve sound quality; The magnetic shielding mechanism is resistant to electromagnetic interference.</p> <p>2. TPA3221+TPA3221, lossless transmission, lossless decoding, no loss, perfectly displaying the dynamics and details of sound, without burrs at high frequencies, rounded at mid tones, powerful at low frequencies, and good elasticity.</p> <p>3. Equipped with protection mechanism, input undervoltage, input anti reverse connection, overheating, overcurrent, and short circuit</p> <p>Product name: 2.1 channel BT amplifier board 100W+100W+200W</p> <p>Product model: -ST21</p> <p>Adapted power supply: The working voltage range is 12-30VDC, and it is recommended to use a DC power supply with a voltage of 24V-28V and a current of 10A or above.</p> <p>Maximum power: Left or right channel - 105W@30V, 4ohm; 55W@30V , 8ohm. Subwoofer - 208W@30V 2ohm; 105W@30V, 4ohm.</p> <p>In short, the higher the voltage, the smaller the resistance, and the greater the output power.</p> <p>Adapted speakers: Left and right channels, supporting 3-8 ohms and speakers up to 100W; The subwoofer supports 2-8 ohms and speakers up to 200W.</p> <p>BT chip: 5.1, transmission distance of 15 meters.</p> <p>Input : BT+AUX+USB drive+sound card.</p> <p>Number of channels: 2.1, Left channel+right channel+subwoofer</p> <p>Power amplifier chip: Two TI TPA3221</p> <p>Protection mechanism: Input undervoltage, input anti reverse connection, overheating, overcurrent, short circuit protection.</p> <p>Type:B:with </p> <p>Colour:Black</p> <p>Material:Plastic</p> <p>Size:121x100x25mm</p> <p>Package Contents:</p> <p>1 * 2.1 channel BT amplifier board</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>