#1 ZK-1001U:


Features
1. High-efficiency connection: transmission distance up to 15 meters, support Bluetooth, AUX, U disk, USB sound card multiple input methods.
2. Built-in boosting circuit: adapted to DC9-24V power supply, especially suitable for battery-powered outdoor and mobile speakers.
3. Multi-function button control: one button to realize play/pause, switch tracks, switch on/off and enter TWS mode, convenient operation.
4. Powerful pair of boxes: two sets of equipment can be combined into left and right channel stereo, strong sense of spatial localization, suitable for DIY production.
5. Intelligent protection mechanism: with anti-reverse, over-temperature, over-current, short-circuit, anti-static protection, to ensure the use of safe and stable.
 
Specification
Product Model: 1001U
Product Name: mono 100W bluetooth amplifier board module with boost with bass and treble adjustment
Amplifier chip: TPA3116D2
Bluetooth version: 5.3
Bluetooth transmission distance: 15 meters
Audio input: Bluetooth + AUX + U disk + USB sound card
Audio Output: Mono 100W
Adaptable power supply: DC9-24V, ≥4A (not connect AC), suitable for 7.4V12V21V and other batteries, not suitable for 24V batteries, fully charged will be over-voltage.
Applicable speakers: 20-100W, 3-8Ω.
Volume adjustment: total volume with button
Single click: play/pause Double click: next song Three clicks: enter or exit T W S mode Long press: power off/on
Protection mechanism: input anti-reverse, over-temperature, over-current, short-circuit, anti-static protection
Features: Support Wuzhi Audio APP, modify the Bluetooth name, password settings, beep volume adjustment, on/off beep, sleep song, firmware upgrade, etc. Pair box function, true wireless function so that two sets of speakers can be combined into a left and right channel pair box, a stronger sense of spatial positioning.
Product size: 99x75x22.8mm
 
Pair box function: This function requires the purchase of two sets of amplifier boards to form a pair box, this product is very suitable for DIY simple mono amplifier, comes with a boost circuit, very suitable for battery-powered, outdoor speakers, trolley speakers, mobile speakers, upgrading or production.
After two independent stereo through TWS interconnection, it instantly becomes left and right channel stereo audio, realizing true wireless connection.
 
Package includes1/2 x Amplifier board (heat sink and knob caps need to be installed by yourself)


#2 ZK-1002T:
 
Q&A
1. How to choose a power supply?

The power supply with the board is critical. The higher the voltage, the greater the current, and the more adequate the output power. If you only have 12V1A, you can bring 3-4 inch speakers. If you are 19V

Above 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 low, the speaker cannot be brought up.
It will pull down the voltage, work abnormally or deteriorate the sound quality.
It is recommended to use a power supply of 18V19V24V with a current above 5A. If you only have 9V12V or 1A2A power supply, you can also use it but the power is low, pay attention to the volume when using
The maximum possible distortion will affect the sound quality.
 
2. How to choose a speaker?

Commonly used speakers are generally 4-8 ohms, and the positive and negative polarity can be distinguished, and the effect is the same. If your speaker has low power, it may be between 20W-50W.
It can be used. The power supply voltage should be lower to prevent the loudspeaker from being burnt after amplifying the sound. For example, choose a power supply below 15V. If you are a 100W-200w speaker, don’t worry about it
For the problem of horn burnout, you can choose a 12-24V power supply. The higher the selected voltage, the greater the sound or power that can be output. The speaker power cannot easily exceed 200W, no
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. No matter in which mode Bluetooth can be connected
Pick up. 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. Need to pay attention
It is necessary to confirm that the Bluetooth connection of this module has been disconnected when using AUX mode.
 
4. How to adjust treble and bass?

The BASS potentiometer in the middle controls the bass, right-handed bass enhancement, left-handed bass attenuation. When the potentiometer is in the middle position, the bass is neither enhanced nor attenuated.
The TREBLE potentiometer on the left controls the treble, the right-handed treble is enhanced, and the left-handed treble is attenuated. When the potentiometer 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 with the right rotation, 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 potentiometer to the left to lower the gain or turn the VOLUME potentiometer on the right to the left to reduce the total volume.
 
5. It's okay if the voice is small, but when the voice becomes louder, the voice becomes muddy?

The sound is distorted, please change to a higher voltage adapter power supply.
 
6. The sound is small, but when the sound becomes louder, the sound freezes?
The input power is insufficient, and the power supply itself is protected against intermittent power failure. Please replace it with a higher-power power supply; or if the power is too large,
the power amplifier board generates serious heat and thermal protection has occurred. In case, reduce power usage or strengthen heat dissipation.
 
7. 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 sound source and the entire sound system. Basically every aspect of the sound system will affect the sound quality, of which the main
The main links are audio transmission line, audio power supply, tone circuit, power amplifier circuit, speakers and surrounding environment. When only the sound source, power amplifier module and speakers match, the sound Quality is the best.
 
 
#3 MT21:

Features:
1: Subwoofer + left channel + right channel, with subwoofer output with high and low bass adjustment, the sound quality is cool and shocking!
2: Cost-effective 100W+50W+50W high-fidelity Bluetooth power amplifier, mature and stable solution, pure sound quality!


Specification:
Product Name : 2.1 channel audio amplifier module with Tone
Product Model : MT21
Bluetooth Version : 5.0(no shielding,15 meters)
Input Sensitivity: 500mV
Audio Input : AUX+ Bluetooth
Channel : 2.1
Chip Solution : Domestic power amnlifior chip
Power Range: DC12~24 V / 5A above (vo not connect to 24V battery pack)
Adapter Speaker : 20~100 w，4~8Ω
Output Power : Max 50W @ R&L channel
Max100W @ subwoofer
Protection Mechanism : Anti reverse connection、Overheat、Over-current、Short circuit
Product Dimensions : 93mm*90mm*22mm
Package Weight : about 185g ( packaging)


PS: In the audio input is enough, the supply voltage/current is enough, there will be
enough output power! The higher the supply voltage, the greater the output pow-er.The smaller the impedance of the speaker, the greater the output power! Please


Package includes:
1*Bluetooth 5.0 digital power amplifier module


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