【Ready Stock】❤ Wuzhi audio2.1 channel Bluetooth digital power amplifier board module high low tone subwoofer high power ❤【QUEEN2019】

Package Included:
1* power amplifier module
Specifications:
Product Name: 2.1 channel Bluetooth audio amplifier module
Product model: zk-tb21
Bluetooth version: 5.0 (no occlusion, 10m)
Input sensitivity: 500mv
Input mode: aux + Bluetooth
Number of channels: 2.1
Power amplifier chip: tpa3116d2 (with am interference suppression function)
Adaptive power supply: DC12 ~ 24 V / 5 A or above (the higher the voltage, the greater the output power)
Adaptive horn: 20 ~ 100W, 4 ~ 8 Ω
Output power: maximum 50W for left and right channels
Subwoofer up to 100W
Protection mechanism: overvoltage, undervoltage, overheating, DC detection, short circuit protection
Product size: 120mm * 100mm * 20MM
Product weight: about 256g (including package)
Tip: when the audio input is enough and the power supply voltage / current is enough, there will be enough output power!!! The higher the power supply voltage is, the greater the output power is, the smaller the horn impedance is, and the greater the output power is! Please make sure that the power of the adaptive power supply is greater than the actual working power of the power amplifier!!!
Description:
1. How to select power supply?
The power supply of the board matching is very important. The ripple of the selected power supply must be small. The power supply with large ripple will cause the noise at the bottom of the power amplifier board to increase and there will be current sound. The higher the voltage, the higher the current, and the more sufficient the output power. If you only have 12V 1a, you can bring a 3-4 inch speaker. If you are above 19v 5a, with 8-10 inch no problem, power must be attached great importance. If the voltage is too low, the sound amplification is easy to cause sound distortion. If the current is too small to bring up, the horn will pull down the voltage, work abnormally or the sound quality becomes poor.
It is recommended to use 18v19v2v power supply with current above 5A. If you only have 9v12v or 1A 2A power supply, you can also use it, but the power is small. If the volume is close to the maximum, it may cause distortion and affect the sound quality.
2. How to choose the horn?
On the type of horn: commonly used horn is generally 4-8 ohm, can be used. The left and right channel speakers need to be connected with full frequency speakers or medium and high frequency speakers, and the power is between 20W and 100W. Subwoofer speakers can not be connected to ordinary speakers, need to be connected with subwoofer speakers, power between 20-100. The subwoofer horn should dive at least 50 Hz.
If your speaker power is small, such as between 20w-50w, it can also be used. The power supply voltage needs to be smaller to prevent burning the speaker after loud. For example, choose a power supply below 15V. If you are a 50W - 100W speaker, you don't have to worry about the burning problem of the speaker. You can choose a 12 - 24 V power su