D900 Bluetooth Audio Amplifier Board with TPA3116 Channel 21 50WX2+100W High-power Home DIY AMP Module How to use ?Different from 2.0 channel amplifier which use Left and Right same speakers, this 1.0 mono amplifier board, its 2 output interface frequency are different, the high-frequency interface is connected to the Treble Speaker, and the low-frequency interface is connected to the Bass Speaker, so as to achieve the stereo tone reverberation effect.TIPS: Don't connect ordinary 2.0 speakers, otherwise the side connected to the bass will feel weak, cuz ordinary speakers cannot achieve bass effect.Note:1. The AC Power will finally convert to DC 12V via the transformer built-in, you can connect DC 24V Power for higher power.2. Only use 1 power supply method. If connect DC Power, the current must over 3A.3. DIY product, the circuit board on the back will be hidden, pls focus your attention on its sound effect.4. The ''Power Switch'' button just for AC Power mode, Not valid in DC mode.5. The mic port not support guitar. for better effect, phantom power is recommended.Description:Features:1. Microphone squawk suppression function2. Microphone volume and master volume are both independently adjustable3. High-end aluminum alloy brushed panel4. Analog wireless microphone board interface5. Support bass effect adjustmentSpecifications:Product Name: 2.1 Channel Bluetooth Amplifier BoardProduct Model: D900Bluetooth: 5.0 (unobstructed, 10 meters)Input Sensitivity: 500mVInput Method: Bluetooth+AUX+MICFM+USB+TF cardChannel: 2.1Amplifier Chip: U.S. original imported chipAdaptable Power Supply: DC 12~24V/5A or above (the higher the voltage, the higher the output power)Adaptive Speaker: 20~100W,4~8 OhmOutput Power: Left and right channel 50w Subwoofer 100WProtection Mechanism: Over-voltage, under-voltage, over-temperature, AC/DC detection, short-circuit protectionHeatsink Size: 50*25*10(mm)Product Included:D900 Power Amplifier Board*1Remote control*1Power cord*1DC cable*1Note: Battery of Remote is Not Included Feature:Support reading MP3 songs in TF-card / U-disk.Independent adjustment of Treble, Bass and Master volume.Built-in Bluetooth Receiver and FM Radio Function.With AUX input Port, can be connected to the PC / Phone / CD.Dual microphone input, adjustable reverb.Support Voltage AC 110V/ 220V or DC 12V/ 24V.