Sell Bluetooth 5.0 ZK-TB21 TPA3116D2 Subwoofer Amplifier Module Channel 2.1 Board AMP V6H5 best price

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. if your speaker power is small, such as between 20w-50w can also be used, the power supply voltage needs to be small, to prevent the loudspeaker burnt after loud, such as choose power below 15v.if you are a 50w-100w speaker, you don't have to worry about burning out the horn. you can choose a 12-24v power supply. the higher the voltage you choose, the more sound or power you can output.speaker power is not easy to exceed 100w, otherwise it will affect the sound quality. 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 Have a nice day! Welcome to visit.Hope you have a nice day! we will be ready to reply you ASAP. If you need more this item ,you can contact us.we will give you our best price. Leave your message!