Vender Bluetooth 5.0 ZK-TB21 TPA3116D2 Subwoofer Amplifier AMP Board Module 2.1 Channel W8V0 al mejor precio

description: 100% brand new and high quality feature: 1.how to choose the power supply? the power supply with the board is very key, the selected power supply ripple must be small, ripple large power supply will lead to power amplifier bottom noise, there is a current sound.the higher the voltage, the higher the current, and the higher the power output. if you only have 12v 1a, you can have 3-4 inch speakers.if you are above 19v 5a, no problem with 8-10 inches, power must be highly valued.if the voltage is too low and the sound is amplified, it will easily cause sound distortion. if the current is too low and the horn cannot be brought up, the voltage will be pulled down, which will lead to abnormal operation or poor sound quality. it is recommended to use 18v19v24v power supply with current above 5a.if you only have 9v12v or 1a 2a power supply, you can also use it but with low power. when using it, choose the volume close to the maximum, which may cause distortion and affect the sound quality. 2.how to select speakers? about the speaker type: commonly used speakers are generally 4-8 ohms, can be used.speakers in left and right channels need to be connected to full frequency or medium and high frequency speakers with power between 20w and 100w.subwoofer speakers cannot be connected to ordinary speakers. speakers with subwoofer speakers should be connected, with power between 20-100w.the subwoofer horn must have a dive frequency of at least 50hz. 3.audio input mode: there are two audio input modes for this audio amplifier module: one is bluetooth input and the other is aux input. bluetooth mode is preferred.bluetooth can be connected in either mode.as long as the bluetooth connection is successful, it is bluetooth mode, and bluetooth mode supports automatic back up.aux insert is aux mode when bluetooth is disconnected.it should be noted that the bluetooth connection of this module is disconnected when using aux mode. 4.how to adjust the main volume? the main - volume knob is used to adjust the main volume.the right main volume goes up and the left main volume goes down.the master volume affects both the left and right channels and the subwoofer volume. specifications: item type: amplifier board model: zk-tb21 material: components color: black bluetooth version: 5.0(no shielding, 10m) input sensitivity: 500mv audio input: aux+bluetooth channel: 2.1 chip: tpa3116d2(with am anti-interference function) power: dc12-24v/5a adapter speaker: 20-100w, 4-8ω output power: max.50w(r and l channel), max.100w(subwoofer) quantity: 1 pc note: transition: 1cm=10mm=0.39inch please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. due to the difference between different monitors, the picture may not reflect the actual color of the item. thank you! package includes: 1 set x amplifier board hello, guys, thank you for visiting my store. Dear buyer,Welcome to our store. Thank you for yo