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How to Select the Audio Input Mode
This amplifier board has two input modes: Bluetooth and 3.5mm AUX.
When both modes input audio signals at the same time, the amplifier board will give priority to the Bluetooth mode;
If you need to use the AUX mode, please make sure that the Bluetooth connection is disconnected.
ZK-TB21 Bluetooth Amplifier Board
- Input Voltage: DC 12V-24V
- Max Power Output: 50W*2（R&L）+100W（Subwoofer）
- Input Method: Bluetooth & AUX
- Channel: 2.1 CH Stereo Output
- Output Impedance：4-8Ω
- Bluetooth Version：BT 5.0
- Protection Functions: Reverse Connection Protection, Short Circuit Protection, Self-recovery Overheat Protection
- Size: 120*100*22mm
- Weight: 195g
NOTE
- Only when the audio input is sufficient and the power supply voltage/current input is sufficient, can there be enough power output.
- The higher the power supply voltage, the greater the output power;
- The smaller the impedance of the speaker, the greater the output power. It is recommended to use a 4Ω speaker.
- Finally, please make sure that the power of the adapted power supply is greater than the actual working power of the AMP to ensure the maximum output power.
Independent Control of Treble and Bass
The bass audio and volume can be adjusted separately, and with the left and right channel speakers, the 2.1 channel brings you a richer sound experience.
Dual TPA3116 D2 Amplifier IC
The maximum modulation frequency can reach 1.2MHZ, and the high-power output distortion is less than 0.1%, ensuring high-quality sound output.
50*25*10MM Extra-large Heat Sink
The extra-large heat sink can provide good heat dissipation for the continuous high-power output of the AMP, thus preventing the chip from being burned.
Warm Reminder:
- The power switch on the board is a standby switch. After the switch is turned off, the machine is in a low-power standby state. To completely turn off the power or unplug it for a long time, you can unplug the DC plug on the machine.
- Properly increasing the voltage or reducing the speaker impedance can effectively increase the output power.
- It is recommended to use a power supply of 12-24V, 5A or more, and the speaker power is 50-100W for the best effect!
Packing Include:
- ZK-TB21 Power Amplifier Board * 1
- Protective Shell * 1 Set
- DC Plug * 1
- Screwdriver * 1
- Knob * 5
S H I V A âš¡
2025-08-27 13:18:04
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Rikki Rocktrap
2025-08-01 21:01:30
My buddy gave me some brand new sonance outdoor speakers. I was going to use them indoor as presence speakers but noticed the output and ohm rating were different than my receiver.I decided for $0.18 I couldn’t go wrong. (Used my Amazon points). Anyways, I was shocked after I assembled and wired this amp board up. The speakers sound perfect with no harshness or dropping out. I opted to go with a 24v 6ah power supply to get the full potential.My buddy who gave them to me was shocked by the clarity and the sound the little board produces. It syncs up immediately with the Bluetooth on my iPhone so I’m able to play Pandora outside with crisp clear sound.Can’t wait to buy the buriable bass channel. If it delivers the way the other two channels do then my bass will be digging deep outside too.
Kyle
2025-07-11 17:53:02
Works good for the money, but the only way to turn it off is to unplug the power supply
Daniel
2025-06-15 14:59:40
The amp in my Klipsch ProMedia 2.1 THX speakers gave out and rather than throw out perfectly good speakers, I purchased this unit along with a power supply for a fraction of the cost of a new desktop setup. Super easy to hook my subwoofer and desktop speakers to this unit and the sound is incredible. In fact, it is much richer and has more fullness than the original Klipsch amp. Definitely a good purchase.
photoshopmike
2025-05-04 21:27:14
I've purchased 2 of these so far, both work great. Sound good and clean using both Skar and Kicker brand car speakers. Bluetooth connects easy and has good range, even when mounted inside of a metal ammo box speaker. No complaints, am about to buy another one. One note, the Bluetooth is an unsecured connection, so anyone can connect without a password, but once you connect your device to it, if someone else trys to connect, you will get a message requesting to release the connection to another device, on your device.
J H S
2024-12-17 11:28:54
Changed out another amplifier that used the same TPA3116D2 amplifier chip with this amp using the same bookshelf speakers. The improvement in the sound quality is significant, especially the base response. Running the amp with 12 volts, which gives about a 30 watt output on the stereo speakers.
Brad
2024-12-02 13:38:15
The only assembly requires attaching covers on the circuit board for isolation and structural rigidity.The screws are tiny so it was a bonus the seller provided an extra screw. Yes, I dropped one but found it two days later. The first amplifier I purchased had a dead right channel. I contacted the seller and within very few days had a replacement. (Intentionally I didn't inspect the circuit board for obvious signs of "cold" solder joints or visible damage.) This amplifier has amazingly good sound for the price. In my case, I use it to power a portable announcing system so did not require concert hall fidelity. It cannot be compared to my Bose portable amplifier, and to do so, would be unfair. I used an off-the-shelf pre-amplifier chip to provide a Mic -In modification to the AUX port. It works great. Highly recommended!
SoCal_C
2024-11-13 17:25:56
I'm not sure if the problem is the unit I received has the wrong capacitor or the wrong offsets. I've included an image that shows two problem points.The first shows that the top panel does not have clearance because of the size of the capacitor on the main board. There is a gap of about 3mm between the bottom of the plate and the top of the offset.The second much more minor problem is at the bottom corner where the power barrel input is located. The pins through the main board are longer than the small offsets provided there preventing the bottom plate cover from fully seating in place.Now, does any of this prevent this unit from working? I really don't know because I won't be using it for the application I need it for because of the quality control issues and build quality.
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