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

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

1. How to choose a power supply?

The power supply with the board is very important. The ripple of the selected power supply must be small. A power supply with a large ripple will cause the bottom noise of the power amplifier board to become larger and there will be current noise. The higher the voltage, the greater the current, and the more sufficient output power. If you only have 12V 1A, you can bring 3-4 inch speakers. If you are above 19V 5A, there is no problem with 8-10 inches, and the power supply must be highly regarded. If the voltage is too low, the amplified sound will easily cause sound distortion. If the current is too small, the speaker will pull down the voltage, which will result in abnormal operation or poor sound quality.

It is recommended to use a power supply of 18V19V24V with a current above 5A. If you only have 9V12V or 1A 2A power supply, it can be used but the power is low. When the volume is selected close to the maximum, it may be distorted and affect the sound quality.

2. How to choose a speaker?

Regarding the type of speaker: The commonly used speakers are generally 4-8 ohms, which can be used. The left and right channel speakers need to be connected to full-range speakers or mid- to high-frequency speakers, and the power is between 20W-100W. The subwoofer speaker cannot be connected to an ordinary speaker, it needs to be connected to a speaker with a subwoofer speaker, and the power is between 20-100. The dive frequency of the subwoofer speaker must be at least 50 Hz.

If your speaker has a low power, such as between 20W-50W, it can also be used. You need a lower power supply voltage to prevent the speaker from burning out after amplifying the sound. For example, choose a power supply below 15V. If you have a 50W-100W speaker, don't worry about the problem of speaker burnout. You can choose a 12-24V power supply. The higher the voltage you choose, 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 power amplifier module has two audio input methods: one is Bluetooth input, the other is AUX input, Bluetooth mode is preferred. Bluetooth can be connected in any mode. As long as the Bluetooth connection is successful, it is in Bluetooth mode, and the Bluetooth mode supports automatic connection back. When Bluetooth is not connected, AUX plug-in is in AUX mode. It should be noted that when using AUX mode, you need to confirm that the Bluetooth connection of this module has been disconnected.

4. How to adjust the main volume?

The MAIN—VOLUME knob is used to adjust the main volume. The right-hand main volume increases, and the left-hand main volume decreases. The main volume has an effect on the volume of the left and right channels and the subwoofer.

5. How to adjust the left and right channel treble and bass?

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

The R&L CHANNEL—TREBLE knob controls the treble, the right-handed treble is enhanced, and the left-handed treble is attenuated. When the knob is in the middle position, the treble is neither enhanced nor attenuated.

Note when adjusting the treble and bass: when the treble or bass is adjusted to the maximum by turning right, if the sound is distorted, it means that the gain of the treble or bass adjustment is too large. You need to turn the treble or bass knob to the left to lower the gain or turn the right side. Turn the MAIN-VOLUME knob to the left to decrease the total volume.

6. How to adjust the subwoofer?

SUBWOOFER—VOLUME knob is used to control the volume of the subwoofer. Right-handed volume increases, and left-handed volume decreases.

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

7. It's okay if the voice is small, but when the voice becomes louder, the voice becomes muddy?

The sound is distorted, please turn down the total volume or change to a higher voltage adapter power supply.

8. The sound is small and it's okay. After the sound becomes louder, the sound freezes?

If the input power is insufficient, the power supply itself has intermittent power failure protection, please replace with a higher power power supply; or the power is too large, the power amplifier board heats up seriously, and thermal protection occurs. Reduce power usage or strengthen heat dissipation.

9. What factors are related to the sound quality?

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