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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)
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.
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.
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.
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.
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.
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.
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.
Tips:For questions about your order, place of delivery, product discount, taxation, delivery time, warranty, shipping, payment, exchange rate, and other questions unrelated to the product, please contact customer service.
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Show Original
A part of the QA has been auto-translated.
0
Q:
Does this also have the awful "the bluetooth device is ready to pair" voice prompts, or not?
Does this also have the awful "the bluetooth device is ready to pair" voice prompts, or not?
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?
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?
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.
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)
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?)
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?)
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
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
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.
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?
is it posible to bridge the left, right and subwofer channels into one channel?
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.
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
Google Home Can i connect with bluetooth Google Home devices? Tks
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.
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
What is the frequency range of the right and left speaker output?
Thank you
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.
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?
Can I use in stereo mode, without turning on the Sub?
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
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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