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 |
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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
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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Dawnso.
The main business scope is industrial hardware, instrumentation, sensors, and various spare parts.
Product information
Technical Details
Additional Information
ASIN | B09J9338KS |
---|---|
Customer Reviews |
4.2 out of 5 stars |
鶹 Rank |
|
Date First Available | Oct. 12 2021 |
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Product Description





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.
Compare with similar items
This Item ![]() ZK‑502L Bluetooth Power Amplifier Board 5.0 Stereo Audio Receiver Dual Channels Digital Audio Amplifier Module for DIY Speakers 5-24V | Recommendations | |||||
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Price | $16.64$16.64 | $20.99$20.99 | $26.04$26.04 | $16.97$16.97 | $24.81$24.81 | $32.71$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 |
Customer ratings | ||||||
Sold by | Dawnsou | developmoreus | Dawnsou | Jiesiung | Luoyuu | Gytibedv-US |
number of channels | 2 | 2 | 2 | 2 | 2 | 2 |
voltage | 24 volts | 5 volts | 24 volts | 15 volts | 25 volts | 24 volts of direct current |
output power | 60 watts | 5 watts | 20 watts | — | 25 watts | 100 watts |
specification met | Industry Standards | — | CE | DC 9-15V | — | — |
mounting type | Through-Hole Mount | Surface Mount | Tablet | Through-Hole Mount | Surface Mount | Surface Mount |
Brands in this category on 鶹
Customer reviews
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.
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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
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
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
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
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
Reviews with images

Works great
Top reviews from Canada
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- Reviewed in Canada on April 12, 2025Verified PurchaseVery 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, 2025Verified PurchaseI 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, 2024Verified PurchaseI 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, 2023Verified PurchaseIt’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.
- Reviewed in Canada on February 7, 2025Verified PurchaseThis 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, 2024Verified PurchaseExactly 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
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
- Reviewed in Canada on May 29, 2024Verified PurchaseIt 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 👌
- Reviewed in Canada on May 8, 2025Verified PurchaseI’m impressed with the output power for how small it is
Top reviews from other countries
- MHallReviewed in the United States on April 6, 2025
5.0 out of 5 stars This is the one!
Verified PurchaseThis 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 CustomerReviewed in the United States on March 18, 2025
5.0 out of 5 stars Good service from seller
Verified PurchaseI 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
- MKReviewed in the United States on May 23, 2025
4.0 out of 5 stars Very affordable Bluetooth solution
Verified PurchaseThis 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.
- KnucklebustedReviewed in the United States on October 5, 2024
5.0 out of 5 stars Awesome Sound for the Price
Verified PurchaseI 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.
KnucklebustedAwesome Sound for the Price
Reviewed in the United States on October 5, 2024
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.
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