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ZK‑502L Bluetooth Power Amplifier Board 5.0 Stereo Audio Receiver Dual Channels Digital Audio Amplifier Module for DIY Speakers 5-24V

4.2 out of 5 stars 68 ratings

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Purchase options and add-ons

Voltage 24 Volts
Manufacturer Walfront
Maximum supply voltage 24 Volts (DC)
Minimum supply voltage 5 Volts
Mounting type Through-Hole Mount
Brand Walfront
Number of channels 2
Output power 6E+1 Watts
Package type box
Specification met Industry Standards

About this item

  • Strong Compatibility: The amplifier module is equipped with a terminal block and a 2.1mm socket, which is compatible with most laptop power ports. Can directly connect to Bluetooth 5.0. and compatible with a variety of speakers. Two 20W, 30W or 50W power amplifier boards are equipped with various speakers (4 to 8 Ω), and support Bluetooth stereo audio input and AUX audio input.
  • Built-in Filter Capacitor: The built in filter capacitor of this digital power amplifier module makes it available for processing sound . Knob potentiometer design, convenient to adjust power ON and OFF, V+ and V‑.
  • Adapted Power Supply Voltage: 5-24V (optional 9V/12V/15V18V/24V and Other Adapters, High Power Recommended High Voltage). To Noise Ratio: >90 dB. Adapted Speakers: 30W-200 W, 4Ω-8Ω.
  • Mechanism: Adopt acrylic protective shell design, with reverse connection , overvoltage , undervoltage , over temperature , short circuit . Self recovery overheating .
  • Wide Range Of Applications: This bluetooth speaker power amplifier board has no POPs sound when powering on, skipping songs and pausing. It is widely used in refitting speakers, power amplifier equipment, and car Bluetooth equipment.

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Product information

Technical Details

Manufacturer ‎Walfront
Place of Business ‎shenzhenshi, guangdongsheng 518109,CN
Part Number ‎Walfront1c0mu4qvrb6020
Parcel Dimensions ‎11.7 x 6.8 x 4.7 cm; 80 g
Item model number ‎ZK 502L
Finish ‎Finish
Material ‎Material
Power Source ‎PowerSource
Voltage ‎24 Volts
Installation Method ‎InstallationMethod
Item Package Quantity ‎1
Spout Height ‎1 Centimeters
Handle Material ‎default
Accessory Connection Type ‎default
Mounting Type ‎Through-Hole Mount
Certification ‎Industry Standards
Included Components ‎inc
Batteries Required? ‎No
Item Weight ‎80 g
Country of origin ‎China

Additional Information

ASIN B09J9338KS
Customer Reviews
4.2 out of 5 stars 68 ratings

4.2 out of 5 stars
鶹 Rank
Date First Available Oct. 12 2021

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ZK‑502L Bluetooth Power Amplifier Board 5.0 Stereo Audio Receiver Dual Channels Digital Audio Amplifier Module for DIY Speakers 5-24V


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Product Description

Bluetooth Power Amplifier Board
Bluetooth Power Amplifier Board
Bluetooth Power Amplifier Board
Stereo Audio Amplifier Board
Stereo Audio Amplifier Board


Features


The amplifier module is equipped with a terminal block and a DC 2.1mm socket, which is compatible with most laptop power ports. Can directly connect to Bluetooth 5.0. and compatible with a variety of speakers.


The built in filter capacitor of this digital power amplifier module makes it available for processing sound signals. Knob potentiometer design, convenient to adjust power ON and OFF, V+ and V‑.


Two 20W, 30W or 50W power amplifier boards are equipped with various speakers (4 to 8 Ω), and support Bluetooth stereo audio input and AUX audio input.


Adopt acrylic protective shell design, with reverse connection protection, overvoltage protection, undervoltage protection, over temperature protection, short circuit protection. Self recovery overheating protection.


This bluetooth speaker power amplifier board has no POPs sound when powering on, skipping songs and pausing. It is widely used in refitting speakers, power amplifier equipment, and car Bluetooth equipment.


Specification:


Item Type: Power Amplifier Board


Material: PCB


Purpose: Digital Power Amplifier Board


Model: ZK-502L


Bluetooth Version: 5.0


Input Method: Bluetooth


Number Of Channels: Left and Right Dual Channels (stereo)


Bluetooth Version: 5.0 (Unobstructed, Approx. 15m/49.2ft)


Signal To Noise Ratio: >90 dB


Adapted Speakers: 30W-200 W, 4Ω-8Ω


12V-8 Ω/12W+12W, 4 Ω/20W+20W


15V-8 Ω/18W+18W, 4 Ω/30W+30W


19V-8 Ω/32W+32W, 4 Ω/45W+45W


24V-8 Ω/38W+38W, 4 Ω/50W+50W


Protection Mechanism: Self Recovery Overheating Protection, Self Recovery Short Circuit Protection


Package List


1 x Power Amplifier Board


1 x Screwdriver


9 x Screw


4 x Brass Connecting Rod


2 x Acrylic Board


1 x Knob


1 x Cable


Note:
The input voltage cannot exceed 24V, otherwise the audio amplifier module will be damaged.

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Price$16.64$20.99$26.04$16.97$24.81$32.71
Delivery
Get it Jun 23 - Jul 7
Get it by Sunday, Jun 15
Get it by Sunday, Jun 15
Get it by Sunday, Jun 15
Get it by Sunday, Jun 15
Get it by Sunday, Jun 15
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Customer reviews

4.2 out of 5 stars
68 global ratings

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Customers say

Customers like the performance, ease of use, and compact design of the electronic component amplifier. They mention it works well with 9V power, is easy to setup, and has an amazing power output. However, some customers have mixed opinions on the sound quality.

16 customers mention "Performance"16 positive0 negative

Customers are satisfied with the performance of the product. They mention it works pretty good, works well with 9V power, and is excellent.

"...My speakers are Roemtech 3.4" / 8ohm / 40W. Worked first at first go, just plugged the speakers, used an old 12V/3.5A adapter...." Read more

"...This thing actually works really well and doesn't heat up as bad as i thought it would...." Read more

"This device worked very well. The only issue is that it drained a 9V battery within 2 days when the unit was off." Read more

"...Ordered afew now to try with different speakers and they all work great! Definitely worth the $20" Read more

5 customers mention "Easy to use"5 positive0 negative

Customers find the product easy to use. They mention it works pretty good and is very easy to setup.

"It’s an amazing little amp. Easy to assemble, and it will take pretty much any type of wallwart power supply…just check the polarity...." Read more

"It works pretty good really easy to setup though as mentioned in another review the Bluetooth is always on, so it will kill the battery in a..." Read more

"Easy hookup and BT connection. This unit is advertised as 50 watt. There may be 5 watts max from the amplifier stage...." Read more

"...The set up was easy, the amp recognizes my phone without any issues...." Read more

3 customers mention "Compact design"3 positive0 negative

Customers like the compact design of the product. They mention it's very small and a great tiny Bluetooth amplifier.

"...Very small, once I design and print the enclosure, it will be very discreet...." Read more

"Great tiny Bluetooth amp..." Read more

"Compact design..." Read more

3 customers mention "Power output"3 positive0 negative

Customers are impressed with the power output of the product. They say it's an amazing little amp.

"It’s an amazing little amp. Easy to assemble, and it will take pretty much any type of wallwart power supply…just check the polarity...." Read more

"I’m impressed with the output power for how small it is" Read more

"Great little amp..." Read more

13 customers mention "Sound quality"9 positive4 negative

Customers have mixed opinions about the sound quality of the product. Some mention it has good sound, while others say the sound levels aren't even close to acceptable and distort the audio a bit.

"...Audio quality seems great. I hear no distortion or feedback...." Read more

"...Sound wise, it actually sounds really good. Won't beat a dedicated Hi-Fi amp, but that's not what I wanted it for...." Read more

"Exactly what i was looking for, nice clear sound for my ammo box speaker i wanted to try making...." Read more

"...It sounds ok up until about half volume where it seems to distort the audio a good bit. Definitely worth the price though 👌..." Read more

Works great
5 out of 5 stars
Works great
Exactly what i was looking for, nice clear sound for my ammo box speaker i wanted to try making. Ordered afew now to try with different speakers and they all work great! Definitely worth the $20
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Top reviews from Canada

  • Reviewed in Canada on April 12, 2025
    Verified Purchase
    Very impressed by this little item. I used it to replace an antiquated CD system in a infrared sauna. Connected it to an unused 12 volt DC lights circuit on the sauna control board. Audio quality seems great. I hear no distortion or feedback. I only have it at half volume using the volume knob on the unit itself then controlling volume with my phone beyond that point. I think it could exceed the ability of the speakers that are currently installed. With the current setup it can go louder than I would ever play it ( two 5" speakers directly to this unit relying entirely on the amplification of this device to drive the speakers) I was able to connect via Bluetooth with my phone with very little effort. Shows up as WZ-BT5.0 I'm able to keep my phone 20 ft away with no disruption in connection.( haven't tested further than that it could potentially work from further away but I haven't tested since it wasn't required)
  • Reviewed in Canada on February 25, 2025
    Verified Purchase
    I got some old bookshelf speakers from the workplace and needed a small amp to go with it. I got this to print my own enclosure and use the speakers as a simple "bluetooth speaker" for the kitchen. Lo and behold, that little amp works like a champ. My speakers are Roemtech 3.4" / 8ohm / 40W. Worked first at first go, just plugged the speakers, used an old 12V/3.5A adapter.

    Sound wise, it actually sounds really good. Won't beat a dedicated Hi-Fi amp, but that's not what I wanted it for. Very small, once I design and print the enclosure, it will be very discreet.

    Only negative - may be a deal breaker for some, but not for me: Even when turned off, the Bluetooth component stays "on". Meaning your phone will keep re-connecting to it if you paired it before. Could lead to unfortunate audio piping if you are not careful. You need to manually "forget" the device in order to be able to re-pair easily something else (like earbuds, car speaker, etc.). Annoying, but for the value, I'm all fine with it.
  • Reviewed in Canada on October 14, 2024
    Verified Purchase
    I bought this to install in my 6year old's 24v dune buggy, bar was really not high. This thing actually works really well and doesn't heat up as bad as i thought it would. It's actually a good choice for the price for any diy speaker setup that doesn't need crazy amounts of power.
  • Reviewed in Canada on June 10, 2023
    Verified Purchase
    It’s an amazing little amp. Easy to assemble, and it will take pretty much any type of wallwart power supply…just check the polarity. The only minor issue was that the device name in the Bluetooth list is not what’s mentioned in the listing: on mine, it’s WZ-BT5.0. It connected automatically as soon as I turned on the unit. True stereo, currently connected to a pair of Pyramid 4080 I had kicking around. Good, balanced sound.
    2 people found this helpful
    Report
  • Reviewed in Canada on February 7, 2025
    Verified Purchase
    This device worked very well. The only issue is that it drained a 9V battery within 2 days when the unit was off.
  • Reviewed in Canada on May 6, 2024
    Verified Purchase
    Exactly what i was looking for, nice clear sound for my ammo box speaker i wanted to try making. Ordered afew now to try with different speakers and they all work great! Definitely worth the $20
    Customer image
    5.0 out of 5 stars
    Works great

    Reviewed in Canada on May 6, 2024
    Exactly what i was looking for, nice clear sound for my ammo box speaker i wanted to try making. Ordered afew now to try with different speakers and they all work great! Definitely worth the $20
    Images in this review
    Customer image
    One person found this helpful
    Report
  • Reviewed in Canada on May 29, 2024
    Verified Purchase
    It works pretty good really easy to setup though as mentioned in another review the Bluetooth is always on, so it will kill the battery in a portable speaker. It sounds ok up until about half volume where it seems to distort the audio a good bit. Definitely worth the price though 👌
    One person found this helpful
    Report
  • Reviewed in Canada on May 8, 2025
    Verified Purchase
    I’m impressed with the output power for how small it is

Top reviews from other countries

  • MHall
    5.0 out of 5 stars This is the one!
    Reviewed in the United States on April 6, 2025
    Verified Purchase
    This is exactly what I needed to interface my BT player into my tractor. Everything is clearly labeled, there is plenty of power, the sound quality is very good, and the bluetooth connectivity is most reliable. All things considered, a very good value.
  • 鶹 Customer
    5.0 out of 5 stars Good service from seller
    Reviewed in the United States on March 18, 2025
    Verified Purchase
    I had a problem with my first one, I contacted the seller and they responded right away. They sent me a new flashlight even though my original one was almost a year old. Thanks
  • MK
    4.0 out of 5 stars Very affordable Bluetooth solution
    Reviewed in the United States on May 23, 2025
    Verified Purchase
    This is a cheap way to get a Bluetooth signal from your phone to the speakers in your vehicle. You can do what I did and gut an old AM radio and mount it in the dash or find some hidden spot to mount it.

    It does exactly what it’s supposed to do but there are no “filters”. Maybe there’s a way to do that but I’m not aware of it. By filters I mean no compression, no consistent volume, no tone controls with the kit. Sound wise, you get what you get.

    All that said, $13 including local tax is still a great deal if you want a Bluetooth signal feed.
  • Knucklebusted
    5.0 out of 5 stars Awesome Sound for the Price
    Reviewed in the United States on October 5, 2024
    Verified Purchase
    I was wanting to tinker with something like this to see if it would work to add Bluetooth to my old car. It powered up and has great sound for the size and price. I've only tested it in the house but I'll soon be setting it up in my 53-year-old Buick that only has an AM radio.

    3/29/2025 Update: I finally wired it up in my dash with a set of stereo speakers. It works very nicely. I wired it to accessory and ignition so it doesn't run the battery down. I used Velcro to attach it to the radio bezel.
    Customer image
    Knucklebusted
    5.0 out of 5 stars
    Awesome Sound for the Price

    Reviewed in the United States on October 5, 2024
    I was wanting to tinker with something like this to see if it would work to add Bluetooth to my old car. It powered up and has great sound for the size and price. I've only tested it in the house but I'll soon be setting it up in my 53-year-old Buick that only has an AM radio.

    3/29/2025 Update: I finally wired it up in my dash with a set of stereo speakers. It works very nicely. I wired it to accessory and ignition so it doesn't run the battery down. I used Velcro to attach it to the radio bezel.
    Images in this review
    Customer imageCustomer image
  • Sherry
    5.0 out of 5 stars This was for grandson
    Reviewed in the United States on December 1, 2024
    Verified Purchase
    Grandson had hooked to speaker and playing music within minutes.