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Under the same current, the power supply voltage is high, and the relative output power can be large. The output power of loudspeakers with different impedances is also different. Usually, the impedance of loudspeakers is smaller and the power is larger.

1. How to select a power supply?

The power supply matched with the board is crucial. 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 electric current sound. The higher the voltage, the larger the current, the more sufficient the output power. If you only have 12V 1A, you can bring 3-4-inch speakers. If you are above 19v 5A, it is no problem to bring 8-10 inches, and the power supply must be highly valued. If the voltage is too low, sound distortion will easily be caused after sound amplification. If the current is too small to bring up the speaker, the voltage will be pulled down, and the work is abnormal or the sound quality will deteriorate.

We recommend that you use a 18V19V24V power supply with a current of more than 5A. If you only have a power supply of 9V12V or 1A 2A, you can also use it but the power is small. When you use it, the volume is close to the maximum, which may cause distortion and affect the sound quality.

2. How to choose a speaker?

About horn type: commonly used horns are generally 4-8 ohm, which can be used. The speaker of the left and right channels needs to be connected to a full-frequency speaker or a medium-high frequency speaker with a power of 20W-100W. Subwoofer Speakers cannot be connected to ordinary speakers, and speakers with subwoofer speakers need to be connected with a power between 20 and 100. The subwoofer speaker dive frequency should be at least 50Hz.

If your speaker power is small, for example, between 20W-50W can also be used. The power supply voltage is smaller to prevent the speaker from burning after amplification. For example, select a power supply below 15v. If you are a 50W - 100W speaker, don't worry about the problem of the speaker burning out, you can choose 12-24V power supply. The higher the voltage, the greater the sound or power that can be output. The speaker power is not easy to exceed 100W, otherwise it will affect the sound quality.

3. Introduction to audio input mode

this audio amplifier module has two audio input modes: one is Bluetooth input, the other is AUX input, and Bluetooth mode takes precedence. Bluetooth can be connected in either mode. As long as the Bluetooth connection is successful, it is Bluetooth mode, and Bluetooth mode supports automatic connection back. When Bluetooth is not connected, AUX is inserted in AUX mode. Note that when using AUX mode, make sure that the Bluetooth connection of this module has been disconnected.

4. How to adjust the main volume?

The MAIN-VOLUME knob adjusts the MAIN VOLUME. The volume of the right-hand master increases and the volume of the left-hand master decreases. The main volume affects the volume of both the left and right channels and the subwoofer.

5. How to adjust the high bass of the left and right channels?

The R & L CHANNEL-BASS knob controls BASS, right-hand BASS enhancement, and left-hand BASS attenuation. When the knob is in the rightmost position, the bass is neither enhanced nor attenuated.

R&L CHANNEL- TREBLE knob is controlled by TREBLE, right-handed TREBLE enhancement, left-handed TREBLE attenuation. When the knob is in the middle position, the treble is neither enhanced nor attenuated.

Note when high and low pitch: when the right rotation of the treble or bass is adjusted to close to the maximum, if the sound is distorted, the gain of the treble or bass adjustment is too large, and the treble or bass knob needs to be left-handed, lower the gain or turn the MAIN-VOLUME knob on the right left to reduce the total VOLUME.

6. How to adjust the subwoofer?

The SUBWOOFER-VOLUME knob controls the volume of the subwoofer. The volume of the right-hand rotation becomes larger, and the volume of the left-hand rotation becomes smaller.

The SUBWOOFER-FREQ knob controls the subwoofer cut-off frequency. The right-hand rotation frequency increases while the left-hand frequency decreases. The frequency adjustment range is 20Hz-200Hz.

7. It's okay if the sound is small. When the sound becomes larger, the sound becomes cloudy?

The sound is distorted. Please turn down the total volume or change the adapter power supply with higher voltage level.

8. It's okay if the sound is small. When the sound becomes larger, the sound is stuck?

If the input power is insufficient and the power itself is intermittently powered off, please replace the power supply with a higher power supply. Or if the power is too large, the power amplifier board will heat up seriously, resulting in thermal protection, reducing power usage or strengthening heat dissipation.

9. What factors do the quality of sound quality have to do?

The quality of the sound quality is not related to the power amplifier module, but also to the power supply, audio source and the entire sound system. Basically, every link of the sound system will affect the sound quality, among which the main links are audio transmission line, sound power supply, tone circuit, power amplifier circuit, sound box and surrounding environment. Only when the sound source, power supply, power amplifier module and speaker match, the sound quality is the best.