1. supports and uses two TPA3255 and six JRC2068, with excellent performance. 2. High power digital amplifier dedicated inductor, high current, low magnetic loss, low heat generation, using oxygen free copper wire to improve sound quality, and magnetic shielding mechanism to resist electromagnetic interference. 3. Choose QCC3034 Qualcomm module, supporting transmission encoding , AAC, , -LL, -HD. 4. Adopting enlarged and thickened heat sinks, copper strips for thermal conductivity, and silent fan for air cooling to sufficient power. 5. Equipped with protection mechanism, including input undervoltage, overheating, overcurrent, and short-circuit protection. Parameter: Product Name: 2.1 Channel Qualcomm BT Amplifier Board 300W+300W+600W Product model: APTX3 Adaptive power supply: Working voltage range: 18-50VDC, no sound when the voltage is below 16V. Recommended voltage: 36V-48V, current: 12A or above DC power supply. Maximum power: Left or right channel: 300W@50V ,4Ω; 160W@50V , 8 Ω. Subwoofer: 600W@50V ,2Ω; 300W@50V ,4Ω; 160W@50V , 8 Ω. In short, the higher the voltage, the smaller the resistance, and the greater the output power. Compatible speaker: Left and right channels: Supports 3-8 ohms, speakers up to 300W; Subwoofer: supports 2-8 ohms, speakers up to 600W. BT chip: QCC3034, transmission distance of 15 meters Input method: BT+AUX, BT priority. When using an audio cable for input, BT needs to be disconnected Number of channels: 2.1, left and right channels+subwoofer Amplifier chip: Two TI original TPA3255 chips Protection mechanism: Input undervoltage, overheating, overcurrent, short circuit protection. No input anti reverse connection protection, positive and negative connections cannot be reversedColor: Picture color Material: ABS Specifications: A integrated Package Contents: 1 * Audio Power Amplifier Only the above package content, other products are not included. 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.