ZK-HT21 Upgrade 2*160W+220W Audio 2.1 Subwoofer BT Power Amplifier Board TDA7498E AMP B Wuzhi Audio

ZK-HT21 is upgraded to support Wuzhi Audio APP, to box function, more lole formats, MP3, WMA, FLAC, APE, WAV (maximum WAV bit rate is 3072kbps).

Supports USB f drives with larger capacity, 64G or le.

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.

Note:

It needs to be aembled by yours, 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 e sure you don't mind.

Product Features

The product adopts TDA7498E chip scheme, with output filter, sound quality, air cooling and heat diipation, and super power. , ba and subwoofer are adjusted independently.

The power interface is the common DC power socket mother base 5.5* 2.1 mm and 2P terminal.

Specification s

Product Name: 2.1 audio amplifier module with tone

Product Model: ZK-HT21

BT Version: 5.0（no shielding, 15 meters）

Audio Input: AUX + BT +USB（Dial wheel on toles songand mode）

: 2.1（Left + right + subwoofer）

Chip Solution: TDA7498E

Adaptive power supply: DC 15~36V (Under voltage protection below 9V, and 12V power supply can also be supported. Do not connect to AC）

Adapter Speaker: 30-200W, 4-8Ω

Output Power: Max160W @ R&L

Max220W @ subwoofer

Protection Mechanism: Anti re connection, undervoltage, overheating, overcurrent, short circuit protection

Product Size: 145*126*28mm

Product weight: net weight 327g, package weight 395g

Tip: when the audio signal input is large enough and the power supply voltage / current is large enough, there will be enough output power!

The higher the power supply voltage, the greater the output power, the smaller the speaker impedance, and the greater the output power!

Please ensure that the power of the adaptive power supply is greater than the actual working power of the power amplifier!

Function of fan

Reduce the overall temperature of the module to prevent it from getting hot.

Diipate heat for the power supply, power amplifier chips and filter s, reduce the temperature rise and the impact of temperature rise on the sound quality, and ensure the long-term stable operation of the components.

Product Details

① USB disk/USB sound card input (Support lole WMA/FLAC/APE/MP3/WAV/M4A format)

② Low noise front stage operational amplifier

③ Large capacity energy storage

④ Filter circuit

⑤ base welding (The and base can be welded)

⑥ PWR work indicator light

⑦ indicator light

⑧ Dial wheel on

⑨ Long life ul silent fan (Locked rotor, no ing, no noise)

⑩ Upgrade BT de chip

Welding Example

① Example of base welding

② base

③ 2.4G

④ Example of welding

The and base should be purchased by yours.

Product Introduction

① Power input (5.5X2.1mm DC plug and 2P terminal)

② Subwoofer

③ Left

④ Right

⑤ Audio input (BT-AUX)

⑥ USB_IN

⑦ Subwoofer frequency (20-200HZ)

⑧ Subwoofer volume

⑨ Left and right

⑩ Left and right ba

⑪ Total volume / switch

⑫ Dial wheel on

Dial wheel on

① Dial wheel on

② Pre the dial on in the middle:

Short pre:pause/play

Long pre:switch mode (USB/BT/AUX）

Tre hit:turn on or off

③ Turn the dial on to the left:

Short pre:previous song

Long pre:volume -

④ Turn the dial on to the right:

Short pre:next song

Long pre:volume +

Wuzhi Audio APP Sleeping Music

Lullaby music allows you to return to nature, help you sleep, decompre 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 multe products can be easily identified.

Change BT paword:

The BT connection paword can be modified to prevent others from hiing. 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.

Update

Box matching function

interconnection

Two power amplifiers are used together

Introduction to box matching function and operation:

1.Turn on two power amplifiers of the same model.

2.Select a power amplifier at will, and pre the total volume knob with key function inwards three times. At this time, the red indicator fes, and the other power amplifier is automatically paired with it as a stereo combination. (if the pairing is not succeful within 15 seconds, the pairing mode will be canceled automatically. You can try again by preing the key three times.)

3.If the pairing is succeful, the selected one will be aigned to the left , and the red indicator will always be on. The other one is the right , and the red indicator will f slowly.

4.The next time you start the machine, you will automatically find the right box. If you want to cancel the box matching mode, you only need to select a power amplifier and pre the on three times.

Product Size

Net weight: about 327g

Package Weight: about 395g

Pack form

Packing list

Installation Diagram

① Knob

② Upper cover board

③ M2*18 copper ar

④ M2*4 screw

⑤ Lower cover board

⑥

⑦ M2*5+4 copper ar

APP Setting Interface

BT name modification steps:

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

BT paword setting steps:

Method 1:

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

Method 2:

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

Q&A

1. How to select the power supply?

The power supply matched with the board is very ant. 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 become larger and there is current sound. The higher the voltage, the greater the current and the more sufficient the output power. If you only have 12V 1A, you can bring a 3-4-inch speaker. If you are above 19V 5A, there is no problem with 8-10 inches. You must pay great attention to the power supply. If the voltage is too low, it is easy to cause sound distortion after sound amplification. If the current is too small to bring up, the horn will pull down the voltage, work abnormally or sound quality will become worse.

It is recommended to use 18V19V24V power supply with current above 8A or 32V10A power supply. If you only have 12V 15V 2A power supply, you can also use it, but the power is small. When you use it, the volume is close to the maximum, which may distort and affect the sound quality. If you want to get the maximum output power, it is recommended to use an adapter above 36V10A, a 160W ~ 200W 4Ω speaker, and adjust the volume to the maximum.

2. How to select speaker?

About speaker type: commonly used speakers are generally 4-8 s, which can be used. The left and right speakers need to be connected with full frequency speakers or medium and high frequency speakers, and the power is between 30W-200W. The subwoofer speaker cannot be connected to an ordinary speaker, but needs to be connected to a speaker with subwoofer speaker, with a power of 50-200W. The submergence frequency of subwoofer speaker shall be at least 50Hz.

If your speaker power is small, such as between 20W-50W, it can also be used. You need to reduce the power supply voltage to prevent ing the speaker after loud. For example, choose a power supply below 15V. The higher the selected voltage, the greater the sound or power that can be output. The speaker power is not easy to exceed 200W, otherwise the sound quality will be affected.

3. Introduction to audio input mode.

The audio power amplifier module has three audio input modes: BT input, AUX audio input and USB f disk input. In BT mode, if an audio cable or USB f disk is inserted, it will automatically switch to audio input mode or USB f disk input mode, and BT mode has the lowest priority. When the audio cable or USB f disk has been inserted, you can also use the dial key to switch the mode.

4. How to adjust the total volume?

The main-volume knob is used to adjust the total volume. The total right-hand volume increases and the total left-hand volume decreases. The total volume affects the volume of the left and right s and subwoofer.

5. How to adjust the left and right and ba?

The R & L ba knob controls the ba. The right-hand ba is enhanced and the left-hand ba is attenuated. When the knob is in themiddle position, the ba is neither enhanced nor attenuated.

The R & L knob controls the . The right-hand is enhanced and the left-hand is attenuated. When the knob is inthe middle position, the is neither enhanced nor attenuated.

Note: if the and total volume are adjusted to the maximum at the same time, it is easy to cause power amplifier protection and sound jang.Lower the or turn the main-volume knob on the right to the left to reduce the total volume.

6. How to adjust the subwoofer?

Subwoofer - volume knob controls the volume of subwoofer. The right-hand volume increases and the left-hand volume decreases.

The subwoofer-freq knob controls the cutoff frequency of the subwoofer.The right rotation frequency increases and the left rotation frequency decreases. The frequency adjustment range is 20HZ-200HZ. It is normal that the right-handed frequency increases and the part with high frequency is released, and the sound of subwoofer will become larger.

7. It's ok to have a small voice, but after the voice becomes louder, there will be the phenomenon of sound turbidity.

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

8. It's ok to have a small voice, but when the voice gets louder, there will be the phenomenon of sound lag.

If the input power is insufficient and the power is protected by its own intermittent power failure, please rep the power with a more powerful one. Or the power is too big, the power amplifier heating seriously, appeared the heat protection situation, reduce the power use or strengthen the heat diipation.

9.What factors are aociated with sound quality?

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