ZK-TB21 TPA3116D2 bluetooth 5.0 Subwoofer Amplifier Board 50WX2+100W 2.1 Channel Power Audio Stereo Bass AMP

Спецификация: item Type: Amplifier Board. Model: ZK-TB21Материал: электронные компоненты. Цвет: Black. Версия Bluetooth: 5.0 (без экранирования, 10 м)Входная чувствительность: 500 мВАудиовход: AUX+Bluetooth. Channel: 2.1Chip: TPA3116D2 (with AM anti-interference function)Power: DC12-24V/5AAdapter speaker: 20-100W, 4-8ΩOutput power: Max. 50W (R and L channel), Max. 100W (subwoofer)Количество: 1 шт. В комплект поставки входят:1 х Усилитель плата (не включает корпус)Вопрос и ответ: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 g