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ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

4.81131
$17.99 /$21.95
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$10.99 /$21.95
Shipping to: United States | Express delivery: 7-12 business days | Standard delivery: 15-25 business days

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Specifications:

Model: ZK-TB21
Material: electronic components
Color: Black
Bluetooth Version: 5.0(no shielding, 10m)
Input sensitivity: 500mV
Audio Input: AUX+Bluetooth
Channel: 2.1
Chip: TPA3116D2(with AM anti-interference function)
Power: DC12-24V/5A
Adapter speaker: 20-100W, 4-8Ω
Output power: Max.50W(R and L channel), Max.100W(subwoofer)
Protection Mechanism: overvoltage ,undervoltage,overhearing,DC detection,short circuit protection
Size: 118x100x22mm/4.6x3.9x0.8inch

Note:

Transition: 1cm=10mm=0.39inch
Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.
Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!

Package Included:

1 x ZK-TB21 Amplifier Board

Q&A:

1. How to choose the power supply?
The power supply with the board is very key, the selected power supply ripple must be small, ripple large power supply will lead to power amplifier bottom noise, there is a current sound.The higher the voltage, the higher the current, and the higher the power output. 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, power must be highly valued.If the voltage is too low and the sound is amplified, it will easily cause sound distortion. If the current is too low and the horn cannot be brought up, the voltage will be pulled down, which will lead to abnormal operation or poor sound quality.
It is recommended to use 18V19V24V power supply with current above 5A.If you only have 9V12V or 1A 2A power supply, you can also use it but with low power. When using it, choose the volume close to the maximum, which may cause distortion and affect the sound quality.

2. How to select speakers?
About the speaker type: commonly used speakers are generally 4-8 ohms, can be used.Speakers in left and right channels need to be connected to full frequency or medium and high frequency speakers with power between 20W and 100W.Subwoofer speakers cannot be connected to ordinary speakers. Speakers with subwoofer speakers should be connected, with power between 20-100W.The subwoofer horn must have a dive frequency of at least 50Hz.
If your speaker power is small, such as between 20W-50W can also be used, the power supply voltage needs to be small, to prevent the loudspeaker burnt after loud, such as choose power below 15V.If you are a 50W-100W speaker, you don"t have to worry about burning out the horn. You can choose a 12-24V power supply. The higher the voltage you choose, the more sound or power you can output.Speaker power is not easy to 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 Bluetooth input and the other is AUX input. Bluetooth mode is preferred.Bluetooth can be connected in either mode.As long as the Bluetooth connection is successful, it is bluetooth mode, and bluetooth mode supports automatic back up.AUX insert is AUX mode when Bluetooth is disconnected.It should be note that the bluetooth connection of this module is disconnected when using AUX mode.

4. How to adjust the main 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.The master volume affects both the left and right channels and the subwoofer volume.

5. How to adjust the height and bass of the left and right channels?
R&L CHANNEL - BASS knob is for BASS, right-handed BASS enhancement, and left-handed BASS attenuation.When the knob is in the right-most position, it does not enhance or attenuate the bass.
The R&L CHANNEL - TREBLE knob is used to control the TREBLE, with right-handed TREBLE enhancement and left-handed TREBLE attenuation.When the knob is in the middle, it does not enhance or attenuate the treble.
Note when adjusting high and low sounds: when the TREBLE or BASS sounds are right-rotated to near maximum, if the sound distortion is distorted, the gain of the TREBLE or BASS sounds is too large. It is necessary to turn the TREBLE or BASS knob to the left to lower the gain 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 controls the VOLUME of the SUBWOOFER.The right-handed volume goes up and the left-handed volume goes down.
The SUBWOOFER - FREQ knob controls the cutoff frequency of the SUBWOOFER.The right frequency increases and the left frequency decreases.The frequency adjustment range is 20HZ-200Hz.

7.What factors are associated 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 transmission 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.
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Electronics Ranking

ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer-Verstärkerplatine 50WX2 + 100W 2.1-Kanal-Power-Audio-Stereo-Bass-AMP

Customer Reviews

4.90 out of 5
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  • 29/08/2020

    Nice quality, sounds great on Bluetooth and 12v DC power. I made an oak enclosure from 90 year old recycled front door. Not tried running the sub channel yet. Really impressed for the money.

    Comments (6)
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  • 05/05/2021

    I am very satisfied with this Bluetooth amplifier. The product really meets and even surpasses my expectations with its good built quality. The sound is very good - nice and clear. I am not an audiophile, though. Bluetooth connects easily and stable, and it is very easy to set it to play. Great value for money. Highly recommend.

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    • 0
      Q: Does this also have the awful "the bluetooth device is ready to pair" voice prompts, or not?
      A:
      Maybe it have.
      Answered by Mobxweez on 13/10/2020Helpful (0)
    • 0
      Q: Can i use a 6 ohm speaker?
      A:
      Yes
      Answered by Rhinoking on 27/09/2022Helpful (0)
    • 0
      Q: Does anyone know which power supplies I should be looking for this board? Would an old laptop power supply be suitable, obviously one in the 12-24v range?
      A:
      It depends on what speaker you are trying to drive through this amplifier. If you use small 3-4 inch speakers then 12v power supply is sufficient if you use bigger speakers you must provide higher power supply say 18v or even higher. Remember If you provide more than 15v power supply don't increase volume more than 70% for 3-4 inch speakers or your speakers may burn.
      Answered by SubhrajeetSheet on 29/08/2021Helpful (0)
    • 0
      Q: Hello can you use a 32V 5A DC supply ?
      A:
      No, maximum 24 volts.
      Answered by dougwoodrow on 17/06/2021Helpful (0)
    • 0
      Q: is there an audible beep/notification sound or a voice for the bluetooth connection?
      A:
      yes, it's just a beep
      Answered by Rishirajc on 17/12/2021Helpful (0)
    • 0
      Q: Is the main volume the volume for subwoofer too, or is subwoofer volume full independent from main volume? (Is the subwoofer volume increased and decreased with the main volume after setting the right volume with subwoofer volume?)
      A:
      The master volume affects both the left and right channels and the subwoofer volume.
      Answered by fanglimin on 26/08/2020Helpful (0)
    • 0
      Q: can I use 24v/ 9A ?
      A:
      the recommended is 5 amps but 9 amps should be fine.
      Answered by Zee757 on 24/11/2021Helpful (0)
    • 0
      Q: Can I connect my Denon PMA 520 AE to this for subwoofer and connect Right and Left channel from this amp? I don't have sub option in the Denon amp.
      A:
      yes, simply get one stereo to stereo splitter adapter or wire. you can then connect subwoofer to your denon amp. And satellites to this zk -tb 21 amp. I think this surely help you out
      Answered by Rishirajc on 30/11/2022Helpful (0)
    • 0
      Q: please tell me I use 19.5v 4.*****w any problem?
      A:
      The specs say the amp will take up to 24V at 5A, so your PSU sounds well suited. So far I've only tested a 12V 1A PSU, it produces a perfectly decent volume into 4 ohm speakers in an average size room.
      Answered by dougwoodrow on 20/04/2021Helpful (0)
    • 0
      Q: is it posible to bridge the left, right and subwofer channels into one channel?
      A:
      Not support bridge connection. If try it burn the amplifier.
      Answered by Alex on 16/03/2022Helpful (0)
    • 0
      Q: Whats the subwoofers 100w rms ohms?
      A:
      arrived, much better than what I expected
      Answered by CARREGOSADel on 21/03/2022Helpful (0)
    • 0
      Q: can this be used with car audio amp?
      A:
      yes, just make sure you use dc to dc power supply
      Answered by Rishirajc on 11/12/2023Helpful (0)
    • 0
      Q: Is the rating rms or peak?
      A:
      RMS
      Answered by SubhrajeetSheet on 09/09/2021Helpful (0)
    • 0
      Q: what is main speaker ohms and L&R speaker ohms
      A:
      support 4-8 omhs
      Answered by Alex on 16/03/2022Helpful (0)
    • 0
      Q: What size connector should I look for when buying an AC adapter? (i.e. Inner Diameter/Outer Diameter measurements of the barrel connector?)
      A:
      connector is provided with it, just connect wires to it
      Answered by Rishirajc on 30/09/2021Helpful (0)
    • 0
      Q: How can I turn off the bluetooth function and just use AUX input? I couldn't turn the BT off, and the device can't detect the AUX input.
      A:
      Only place on P2 aux cable
      Answered by Davi Felix on 24/06/2021Helpful (0)
    • 0
      Q: Can I use it only in stereo, leaving the subs output open?
      A:
      yes
      Answered by BG571045793 on 06/12/2022Helpful (0)
    • 0
      Q: Can use the subwoofer 200w for the board or must the subwoofer 100w??
      A:
      Your subwoofer can handle 200w RMS power so there's no problem if you provide 100w rms at peak power(full volume) of this amplifier. but with this amp you will never get that much bass that your subwoofer is capable of producing.
      Answered by SubhrajeetSheet on 29/08/2021Helpful (0)
    • 0
      Q: Google Home Can i connect with bluetooth Google Home devices? Tks
      A:
      Unfortunately I cant answer now
      Answered by CarManBy on 23/02/2022Helpful (0)
    • 0
      Q: Requirements: 12-24v/5a and above. QUESTION IS: Can I use 12v-3.7 amp?
      A:
      Yes you can. But output power will also be low.
      Answered by Semparithi on 24/11/2021Helpful (0)
    • 0
      Q: Can i feed this amp with a 12v 18A computer power supply without any problems ?
      A:
      Probably. But are you really sure it can deliver 18 amps? That is a LOT of current! In theory that shouldn't be a problem, the amplifier should only draw the current it needs. But if something goes wrong there is a danger the amplifier could try to draw too much current and 18 amps would be enough to destroy it.
      Answered by dougwoodrow on 05/08/2021Helpful (0)
    • 0
      Q: What is the frequency range of the right and left speaker output? Thank you
      A:
      20hz to 20khz
      Answered by BG451117452 on 19/09/2021Helpful (0)
    • 0
      Q: does the max 50w r
      A:
      Delivers what it promises, I recommend.
      Answered by TopherCG on 19/08/2022Helpful (0)
    • 0
      Q: Is there any version of this device with remote controller? Is there any way to add it? Or any similar 2.1? The sound quality is very good.
      A:
      Get a local Bluetooth FM module that comes with remote and connect that module's output to this amplifier's aux input. It may solve your problem. But remember always connect to that module's Bluetooth and not to this amplifier's Bluetooth or your remote will work but not affect.
      Answered by SubhrajeetSheet on 29/08/2021Helpful (0)
    • 0
      Q: Can I use in stereo mode, without turning on the Sub?
      A:
      there is separate control knob for bass just decrease it to minimum.
      Answered by SubhrajeetSheet on 29/08/2021Helpful (0)
    • 0
      Q: Can use the 200w subwoofer 12inch 4ohm with two speaker 60w 6,5inch 4ohm for this board? And I have power 24v6A. It is working or not?
      A:
      It will definitely work without an issue but you will not get that much output power as your subwoofer is capable of.
      Answered by SubhrajeetSheet on 29/08/2021Helpful (0)
    • 0
      Q: How to set a Bluetooth connection?? There's no any button to do it. It needs some additional part or by default is setting in Bluetooth connection??
      A:
      it is in pair mode if no device is connected. i gues it could be annoying if someone unautorised keeps connecting
      Answered by ficho1234 on 12/11/2021Helpful (0)
    • 0
      Q: is there any way to just drive a mid range speaker off of the 100w channel (in other words eliminate the frequency filter) or is it impossible?
      A:
      impossible
      Answered by BGATR on 15/04/2022Helpful (0)
    • 0
      Q: i have 2 questions? 1- can we adjust stereo frequency or is their hpf on stereo output? 2 - is aptx or above codecs supporter in bluetooth?
      A:
      No
      Answered by BGATR on 15/04/2022Helpful (0)
    • 0
      Q: Can I use 300x2 subwoofer for this board?
      A:
      More information is required but the higher the wattage less volume 24volt would be recommended and 4 ohm speakers would be recommended read information on web site. Wayne
      Answered by BG578501710 on 19/12/2021Helpful (0)

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