2.1 Digital Amplifier with Bluetooth - 2x50W + 100W for Subwoofer Output

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2.1 digital amplifier with Bluetooth - 2x50W + 100W for Subwoofer output

Specifications
  • Model: ZK-TB21
  • Material: electronic components
  • Black color
  • Bluetooth version: 5.0 (unshielded, 10m)
  • Input sensitivity: 500 mV
  • Input audio: AUX + Bluetooth
  • Channel: 2.1
  • Chip: T PA3116D2 (with AM anti-interference function)
  • Power: DC12-24V / 5A
  • Speaker adapter: 20-100 W, 4-8 Ohm
  • Output power: maximum 50W (R and L channel), maximum 100W (subwoofer)
  • Protection mechanism: overvoltage, undervoltage, hearing, DC detection, short circuit protection
  • Size: 118x100x22mm / 4.6x3.9x0.8 inch
1. How to choose the power supply?
 
The power supply with the card is very important. The higher the voltage, the higher the current and the higher the output power.
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.
If the voltage is too low and the sound is amplified, it will cause easily distort the sound.
It is recommended to use an 18V 19V 24V power supply with current higher than 5A. If you only have 9V 12V or 1A 2A power supply, you can also use it but with low power.
When using it, choosing a volume close to maximum could cause distortion and affect the sound quality.
2. How to select speakers? 
 
Speaker type information: commonly used speakers are generally 4-8 ohms and can be used.
The speakers in the left and right channels must be connected to full or medium and high frequency speakers with power between 20 W and 100 W.
The subwoofer speakers cannot be connected to normal speakers.
Speakers with subwoofer speakers must be connected, with a power between 20 and 100 W.
The subwoofer horn must have a dive frequency of at least 50 Hz.
If the speaker power is small, for example between 20W-50W can be used, the supply voltage should be small, to prevent the speaker from burning out.
If you are a 50W-100W speaker, you don't have to worry about burning the horn. You can choose a 12-24V power supply. The higher the voltage you choose, the more sound or power you can output.
The speaker power does not easily exceed 100W, otherwise it will affect the sound quality.
 
 
3. Audio input mode
 
There are two audio input modes for this audio amplifier module: one is the Bluetooth input and the other is the AUX input.
Bluetooth mode is preferred.
 Bluetooth can be connected in both modes.
If you enter the AUX when the Bluetooth is disconnected so the AUX mode is being used.
The bluetooth connection of this module is disconnected when using AUX mode.

4. How to adjust the master volume?
 
The MAIN - VOLUME knob is used to adjust the MAIN VOLUME. 
The right main volume goes up and the left main volume goes down.
Master volume affects left and right channels and subwoofer volume.

5. How to adjust the treble and bass of the left and right channels?
 
CHANNEL R & amp; L - The BASS knob is for the BASS, the enhancement of the BASS for right-handers and the attenuation of the BASS for left-handers. When the knob is in the far right position, it does not enhance or attenuate the bass.
The R & amp; L CHANNEL - TREBLE knob is used to control TREBLE.
When the knob is in the center, it does not boost or cut the treble.
Note when adjusting the treble and bass sounds: when the TREBLE or BASS sounds are turned to the right almost to the maximum, if the distortion of the sound is distorted, the gain of the TREBLE or BASS sounds It's too big.
You need to turn the TREBLE or BASS knob to the left to lower the gain or turn the MAIN-VOLUME knob to the right to the left to reduce the VOLUME total.
 
 
6. How to adjust the subwoofer?
 
The volume turns right and turns left down. 
The SUBWOOFER - FREQ knob controls the SUBWOOFER cutoff frequency.
Turning right increases and turning left decreases.
The frequency adjustment range is 20HZ-200Hz. 
 
7. What factors are associated with sound quality?
 
Sound quality is not only related to the power amplifier module, but also to the power supply, the sound source and the entire audio system. Basically every connection of the audio system will affect the sound quality, including the main connection is the audio transmission line, audio power supply, tone circuit, amplifier circuit, speakers and the surrounding environment.
The sound quality is better when the sound source, power supply, amplifier module and speaker are matched
Supplier code
ZK-TB21
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