ZK‑502L Bluetooth Power Amplifier Board 5.0 Stereo Audio Receiver Dual Channels Digital Audio Amplifier Module for DIY Speakers 5-24V : �鶹��.ca: Electronics

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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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70 ratings

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

$16.64

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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	70 ratings 4.2 out of 5 stars
�鶹�� Rank	#9,197 in Electronics (See Top 100 in Electronics) #33 in Audio Component Amplifiers
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.

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Price	$16.64	$20.99	$26.04	$16.97	$26.17	$32.05
Delivery	Get it by Friday, Jun 27	Get it by Wednesday, Jun 25	Get it by Wednesday, Jun 25	Get it by Wednesday, Jun 25	Get it by Wednesday, Jun 25	Get it by Wednesday, Jun 25
Customer ratings	4.270	4.423	4.52	4.43	4.52	4.55
Sold by	Gytibedv-US	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

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Customer reviews

70 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.

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Performance Easy to use Compact design Power output 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

"Awesome product, works great" Read more

"Works great. Cheap solution for a classic car when you don't want to spend money on a new radio." Read more

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

"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

"...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

"Compact design..." Read more

"Great tiny Bluetooth amp..." 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.

"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.

"...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

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

"Excellent!!! Regular speaker converted into a BT speaker, plus amplifier! Nice project eh..!" Read more

"...Start up is quick, instant connection. Sound quality is okay." Read more

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Top reviews from Canada

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John Canuel
Nice little Bluetooth stereo.
Reviewed in Canada on June 16, 2025
Verified Purchase

I used it to retrofit an old GMC car stereo. It can also be used just inside the glove box.

Read more

Helpful

David Sauvé
Actually works really well!
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.

Read more

Helpful

Chad Weir
Works well, very impressed
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)

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Justin
Impressed
Reviewed in Canada on May 8, 2025
Verified Purchase
I’m impressed with the output power for how small it is

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Troy
Not good save your money.
Reviewed in Canada on December 9, 2023
Verified Purchase
I was planning on making a portable sound bar with this powered by a Milwaukee m18 battery but it has Very low output volume. I tried a few different speakers to check if it was a speaker size problem or not. All speakers were 4 ohm and no real volume change. While it technically works the sound levels aren’t even close to acceptable. In a quiet room beside the speakers it would be quiet. Then after about 20 mins of playing music and trying to figure out what I wanted to do about getting a reasonable volume level the chip set let a puff of smoke out and there it was dead. I would hope this was a 1 off experience but I would say this amp is about 5 watts at the most. Might be ok if your running the outputs into a real amplifier.

Read more

Troy

Not good save your money.

Reviewed in Canada on December 9, 2023
I was planning on making a portable sound bar with this powered by a Milwaukee m18 battery but it has Very low output volume. I tried a few different speakers to check if it was a speaker size problem or not. All speakers were 4 ohm and no real volume change. While it technically works the sound levels aren’t even close to acceptable. In a quiet room beside the speakers it would be quiet. Then after about 20 mins of playing music and trying to figure out what I wanted to do about getting a reasonable volume level the chip set let a puff of smoke out and there it was dead. I would hope this was a 1 off experience but I would say this amp is about 5 watts at the most. Might be ok if your running the outputs into a real amplifier.

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Helpful

Raymond Fairfield
Amazing
Reviewed in Canada on March 14, 2025
Verified Purchase
Awesome product, works great

Read more

Helpful

Craig Williams
Works great.
Reviewed in Canada on April 9, 2025
Verified Purchase
Works great. Cheap solution for a classic car when you don't want to spend money on a new radio.

Read more

Helpful

Costin G.
surprisingly good
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.

Read more

Helpful

Top reviews from other countries

MHall
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.

Read more
�鶹�� Customer
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

Read more
MK
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.

Read more
Knucklebusted
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.

Read more

Knucklebusted

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.

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Sherry
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.

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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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Works great

Top reviews from Canada

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Not good save your money.

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Top reviews from other countries

5.0 out of 5 stars This is the one!

5.0 out of 5 stars Good service from seller

4.0 out of 5 stars Very affordable Bluetooth solution

5.0 out of 5 stars Awesome Sound for the Price

Awesome Sound for the Price

Images in this review

5.0 out of 5 stars This was for grandson

This is the one!

Good service from seller

Very affordable Bluetooth solution

Awesome Sound for the Price

This was for grandson