The ZK-TB21 and ZK-MT21 products have been upgraded to APP versions, supporting Wuzhi Audio APP.

Wuzhi Audio APP download link:

http://www.qingdaowuzhi.cn/appdownload/Wuzhi_Audio.apk

For Apple iOS phones, please search for 'wuzhi audio' in the Apple App Store to download and install.

Before, the left and right channels of AUX audio input of the product were mixed, and stereo sound could not be emitted, which brought trouble to customers. Now the TB21S product has been modified to generate stereo.

Note!

It needs to be assembled by yourself, and the material package is given a screwdriver.

The suitable power supply of the product is DC power supply, and AC power supply is not allowed!

The color of the product may be slightly different from the picture due to the differences of light, angle and shooting equipment.

The product size is measured manually. Please allow slight deviation in the measurement data and make sure you don't mind.

ZK-TB21S， ZK-TB21，ZK-MT21S，ZK-MT21， the four products are 2.1 channel BT audio power amplifier module, 50Wx2 stereo + 100W subwoofer.

Each product has different characteristics. The power amplifier chip, BT version and whether it supports Wuzhi Audio APP are different:

ZK-TB21S is an upgraded version of ZK-TB21. It adopts TPA3116D2 power amplifier chip and BT version 5.1. It increases the midrange adjustment of stereo part, and forms a full coverage of bass, midrange and treble sound effects in combination with subwoofer + treble. The human voice is highlighted and clearer. High end encoder is added for up and down song selection, pause / play, and AUX / BT / USB sound source switching selection.AUX external lead XH2.54-3P socket is added.The subwoofer frequency adjustment is changed to internal board debugging. After debugging, the customer will not change at will. BT input + AUX input + USB flash disk input + USB sound card input, support Wuzhi Audio APP.

ZK-TB21 also adopts TPA3116D2 power amplifier chip, BT version 5.0, BT input + AUX input.

ZK-MT21S is an upgraded version of ZK-MT21. It adopts Chinese power amplifier chip and BT version 5.1. It increases the midrange adjustment of stereo part, and forms a full coverage of bass, midrange and treble sound effects in combination with subwoofer + treble. The human voice is highlighted and clearer. High end encoder is added for up and down song selection, pause / play, and AUX / BT / USB sound source switching selection. The subwoofer frequency adjustment is changed to internal board debugging. After debugging, the customer will not change at will. BT input + AUX input + USB flash disk input + USB sound card input, support Wuzhi Audio APP.

ZK-MT21 adopts Chinese power amplifier chip, BT version 5.0, BT input + AUX input.

Wuzhi Audio APP is an audio app with timed shutdown function. It has its own sound scene, 10 kinds of natural sounds and up to 1023 sound combinations. Comprehensive functions: you can modify the BT name of each product. Set the BT connection password. You can adjust the volume of the prompt tone. The switch prompt tone can be turned on or off. USB flash disk playlist function, open USB flash disk playlist, select music at will, and support shaking to switch songs. Support customized 10 segment sound effects and arbitrary adjustment to make up for deficiencies, so that different speakers can achieve better sound effects.

Model：ZK-TB21S

Brand: Wuzhi Audio

Product Name: 2.1channel BT 5.1 power amplifier module

Product Model: ZK-TB21S

Amplifier Chip: TPA3116D2

Channels: 2.1 channel (left channel + right channel + subwoofer)

Audio Input: AUX + BT+USB disk + USB sound card

BT Version: 5.1

Switching Mode: Mechanical switch (without long press and wait)

Adaptive Power supply: DC12~24V, ≥8A (Do not connect to AC)

Adapter Speaker:

L&R channels 20-50W, 4-8Ω

Subwoofer 20-100W, 3-8Ω

Output power:

R&L channel≤50W

Subwoofer≤100W

Protection Mechanism: Input anti reverse connection, overheating, overcurrent and short circuit protection

Product Size: 119*100*22mm

Product Weight: about 196g

Package Weight: about 248g

Model：ZK-TB21

ZK-TB21 product upgrade, supporting Wuzhi Audio APP.

Brand: Wuzhi Audio

Product Name: 2.1 channel TPA3116D2 BT digital power amplifier module with Tone

Product Model: ZK-TB21

BT Version: 5.0

Input Sensitivity: 500mV

Audio Input: AUX + BT5.0

Channels: 2.1

Chip Solution: TPA3116D2

Power Range: DC12~24V/5A above (Do not connect to AC)

Adapter Speaker: 20W~100W, 4~8Ω

Output Power:

Max50W @ R&L channel

Max100W @ subwoofer

Working Type: Class D

DC socket: 5.5*2.1mm

Protection Mechanism: overvoltage, under-voltage, overheating, DC detection, short circuit protection

Product Size: 118mm*100mm*22mm

Product Weight: about 195g

Package Weight: 256g

Model：ZK-MT21S

Brand: Wuzhi Audio

Product Name: 2.1channel BT audio power amplifier board module

Product Model: ZK-MT21S

Amplifier Chip: Chinese chip

Channels: 2.1 channel (left channel + right channel + subwoofer)

Audio Input: AUX + BT+USB disk + USB sound card

BT Version: 5.1

Switching Mode: Mechanical switch (without long press and wait)

Adaptive Power supply: DC12~24V, ≥8A (Do not connect to AC)

Adapter Speaker:

L&R channels 20-50W, 4-8Ω

Subwoofer 20-100W, 4-8Ω

Output power:

R&L channel≤50W

Subwoofer≤100W

Protection Mechanism: Input anti reverse connection, overheating, overcurrent and short circuit protection

Product Size: 93*96*22mm

Product Weight: about 136g

Package Weight: about 187g

Model：ZK-MT21

ZK-MT21 product upgrade, supporting Wuzhi Audio APP, with timed shutdown function, sleep aid function, and sound effect function. You can modify the BT name, modify the BT password, and adjust the size of the prompt tone. The prompt tone can be turned on or off.

Brand: Wuzhi Audio

Product Name: 2.1 channel BT audio power amplifier module

Product Model: ZK-MT21

BT Version: 5.0

Input Sensitivity: 500mV

Audio Input: AUX + BT 5.0

Channels: 2.1

Chip Solution: Chinese chip

Power Range: DC12~24V/5A above (Do not connect 24V battery pack, do not connect to AC)

Adapter Speaker: 20W~100W, 4~8Ω

Output Power:

Max50W @ R&L channel

Max 100W @ subwoofer

DC socket: 5.5*2.1mm

Protection Mechanism: against reverse connection, overheating, overcurrent and short circuit protection

Product Size: 93mm*90mm*22mm

Product Weight: about 130g

Package Weight: 185g

TB21S Product main functions

① Power input (5.5×2.1mm DC plug)

② Subwoofer

③ Right channel

④ Left channel

⑤ USB disk/USB sound card input

⑥ AUX input

⑦ Encoder

Long press: mode switching

Short press: play / pause

Rotating: switching songs

⑧ Subwoofer volume/bass

⑨ Left and right channel Alto

⑩ Left and right channel Treble

⑪ Total volume/switch

*Built in subwoofer frequency adjustment potentiometer.

Encoder high end experience

① Increase the high-end experience of rotary encoder,  which is convenient and fast without switching up and down songs and modes by mobile phone.

② Subwoofer

③ Midrange

④ Treble

The stereo adds midrange adjustment, the adjustment range of subwoofer, midrange and treble sound effects is fully covered, the human voice is prominent, and the sound is more transparent.

TB21S Product details

① Built in subwoofer frequency adjustment to avoid random frequency change

② AUX IN:

AUX intelligent noise elimination processing reduces the bottom noise problem caused by audio line interference, and adds aux expansion interface, which is easier to match and refit

③ AUX outgoing interface

④ USB IN:

Add USB flash disk interface, rotate encoder to cut songs freely, and app supports USB flash disk song selection and song playing display

Installation example of external antenna（Same as other products）

① Example of antenna base welding

② Antenna base

③ 2.4G antenna

④ Example of antenna welding

Note: The antenna and antenna base should be purchased by yourself.

TB21S Installation Diagram（The installation method of other products is the same）

① M2*3 screw

② Upper cover board

③ Knob

④ M2*16 copper pillar

⑤ M2*3+3 copper pillar

⑥ M2*3 screw

⑦ Lower cover board

⑧ PCB

⑨ Free screwdriver and terminal

Wuzhi Audio APP Sleeping Music

Lullaby music allows you to return to nature, help you sleep, decompress and heal your body and mind. Wuzhi Audio APP has the function of regular shutdown.

10 natural sounds are Sound bowl, Stream, Wave, Sea wave, Thunderstorm, Bird song, Cry of insects, Frogs, Bonfire, Guqin, up to 1023 sound combinations.

10 kinds of natural sounds create unique natural sound scenes, create a natural atmosphere, quickly calm your mood and realize deep sleep.

Wuzhi Audio APP Function

Change BT name:

The BT name of each product can be changed, and multiple products can be easily identified.

Change BT password:

The BT connection password can be modified to prevent others from hijacking.

This function can be turned off.

Adjust the volume of prompt tone:

The volume of prompt tone can be adjusted to meet different needs of customers.

ON / OFF prompt tone:

The prompt tone can be turned on or off.

USB flash disk playlist function(ZK-MT21 does not have this function):

Open the playlist of USB flash disk, select music at will, and support shaking to switch songs.

Wuzhi Audio APP Sound Function

Wuzhi Audio APP has popular, classical, jazz, country, natural, rock and other sound effects. It supports custom 10 segment sound effects and arbitrary adjustment to make up for deficiencies, so that different speakers can achieve better sound effects.

Classic mechanical volume knob

Turn the knob to switch the machine on and off, no need to press and wait to see the indicator light.

After power off, BT turns off and enters low power consumption mode.

Timeless place of classic mechanical volume knob:

1.With volume scale, you can know the current volume. The digital tuning position is unknown. I don't know the current volume. I will be startled by the sudden loud volume when I turn on.

2.Turn it off when the volume is turned to the lowest, which is not easy to damage the speaker and power amplifier.

3.The mechanical switch turns off without long pressing and waiting, which is convenient and fast.

4.The real stepless tuning is not digital multi-stage grading adjustment.

APP Setting Interface

BT name modification steps:

[enter a new BT name] → [click set button] → [system automatic restart] → [cancel pairing of mobile BT with the original BT name] → [find a new BT name and re pair]

BT password setting steps:

Method 1:

[turn on BT password switch] →Use default password 1111

Method 2:

[turn on BT password switch] → [enter password] → [click the setting button] → [the system will restart automatically] → [cancel pairing, and you will be prompted to enter password when connecting again]

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