ZK-502T Bluetooth Amplifier Board with Treble and Bass Control, TPA3116D2 50W x 2, DC:9-24V, Bluetooth 5.0 AMP Board for Home Passive Speakers
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Availability:
In Stock.
Arrives
Friday, Jul 4
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Features
- TPA3116D2 HIFI Chip Solution: Stereo Dual-channel Output to Ensure Continuous Serial High-power Operation, THD 0.1%. Wide Voltage Input DC: 9-24V;
- Treble & Bass Control: If You Are Tired of The Inherent High& Low Bass, Why Not Try The High & Low Control Knob! This Will Make You Feel Like Being In A Movie Theater.;
- BT and AUX Function: BT5.0 version, Transmission Distance Is Farther. The Transmission Distance Can Reach 49 Feet In An Open Environment. If your Play Device Does Not Have BT, You Can Also Input Audio Signals Through The 3.5MM Headphone Plug.;
- Safety Protection: This Amp Board Has Overheat Protection, Circuit Protection, Over-voltage and Under-voltage Protection;
- 7 * 24 Hours After-sales Service: Paying Attention To Customer Experience And Satisfying Customers Is Our Service Tenet. If You Have Any Questions About The Product, or The Product Has Quality Problems, Please Contact Us At Any Time, We Will Give You A 100% Satisfactory Answer.
Item dimensions L x W x H: 4.33 x 2.76 x 0.83 inches
Voltage: 24 Volts
Manufacturer: DAMGOO
Maximum Supply Voltage: 24 Volts (DC)
Minimum Supply Voltage: 9 Volts (DC)
Is Discontinued By Manufacturer : No
Product Dimensions : 4.33 x 2.76 x 0.83 inches; 3.92 ounces
Item model number : ZK-502T
Date First Available : May 7, 2020
Manufacturer : DAMGOO
Best Sellers Rank: #42,507 in Electronics (See Top 100 in Electronics) #181 in Audio Component Amplifiers
#181 in Audio Component Amplifiers:
Customer Reviews: 4.3 4.3 out of 5 stars 356 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Jul 4
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To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I have the DAMGOO ZK-502T and the ZK-1002 digital amps. They are both great running on a 16V laptop supply. Both provide plenty of volume. I have bought class-D for the TV and for the garage, and I got great results. I needed replacements due to a house fire. ** After a few weeks, mine failed. The BT "ready" signal continued to beep, interrupting music play on the wired input. BT has priority, and if it fails to connect, well, you are stuck with repeating beeps. Amazon Chat support quickly arranged for a warranty replacement with return of failed item. Replaced item works fine. ** The directions for these talk about what size of speakers they will support, and that small speakers require less power. This isn't right. The truth is that larger speakers are generally more efficient. In fact, if you have very large, efficient speakers, you can probably drive them straight out of your computer's sound card. I've done it. Your speakers will make all the difference; get good ones. If you go to a thrift store, only get a name brand like Sony, Aiwa, Yamaha, KLH, Pioneer. Never a lesser brand like Sharp or RCA. I have good quality 8 Ohm Yamaha speakers. Now I'll focus on the differences between these two that I think are most important. ZK-502T pro: bass and trebble controls! I like the flexibility. con: lame stick-on heat sink, probably should lay it flat. Better yet, mount with real thermal tape. ZK-1002 pro: larger screw-mounted heat sink, suitable for mounting in any position. Good, because mine is outside and exposed to the summer heat. pro: neat looking inductor coils, but I can't hear the difference. ZK-502T Current test with 2x 18650 cells (8 Volts) at 50% physical volume Average values: 50mA idle/quiet BT 100mA 50% vol BT 200mA 75% vol BT (with 1 Amp peaks) 600mA 80% vol BT (with 2 Amp peaks) 2500mA peak at 100% vol BT Recommended for long battery life: 2x 18650 cells with 2500mAh capacity, 12 to 24 hours runtime depending on volume. Better than some products off the shelf. Common A/C power supply recommendations: Minimum: 9V 1Amp Also suitable: 12V 3Amp, 16V 4Amp For 6dB greater distortion free volume: 19V 4.5 Amp The biggest difference between power supplies is that the audio is 6dB louder at most at 16V plus. The power regulator stays cool at 9V and begins to heat up at 16V. The main chip stays cool at 9V, and at 16V heat begins to build up as it is slowly dissipated through the board and components. I used a thermal camera to check this, and max temp I ever saw was a moderate 100 degrees F. Loud volume with a weak 9V supply can cause it to fail and restart. So only use a weak 9V supply if you plan on listening at moderate levels. With my 16V supply, there is sufficient current available for very loud music with no interruptions. Higher voltage is required for more volume, but results in more heat. At 16V, temps reach 115 degrees F. Semiconductors can take much more heat, and the main TPA311 chip has thermal protection. So these measurements are only for your information. The supplied stick-on heat sink didn't heat up much -- it is for show. Heat is also dissipated from the main chip through the board, however. I scraped off the black adhesive and used thermal tape instead -- with better results. I recommend you do this if you use a 24V supply. The reason I tested current usage was to confirm what I suspected -- that these amps are very efficient and require little power. I also wanted to know my battery life. I recommend 2 18650 cells. More than that will offer more volume, but will shorten battery life, as more power will be wasted in the power regulator. My AUX audio source is a Sony walkman mp3 player. Your source and/or a higher voltage power supply could get you more output power. But I believe it would never be close to 25 Watts, and this is something we should all be aware of. Bluetooth devices with Aux capability usually have better performance on BT. This amp is no exception. Idle power use is lower and audio is clearer at low levels. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - More testing with a 12V battery and a new setup. See photo of my weekend project: Li-Ion battery, solar power, handy carry handle. With the battery disconnected, and in direct sun, the panels power this at medium volume. With the battery connected it extends battery life. Estimated life of 20 hours. (No time limit while in direct sun.) Approximate current used: BT 22mA (OFF) idle 50 mA low volume 75 mA medium volume 200mA loud volume 600 mA Current peaks at 2A before distortion sets in. Any supply with at least 2 Amps and a minimum of 9V should be good for a quiet location, 16V if a bit more volume is desired for a loud location. (edited) Good luck and have fun! -Chris
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Reviewed in the United States on February 21, 2021 by Christophe Christophe
Overall this has been a great addition. I had some 6x9 speakers in boxes sitting and this amp let me hook them up to my computer very easily. The sound has been great with one minor issue. There is a noise gate that will shut the sound off when no sound is being played. However, if there are quiet sections the noise gate activates and cuts the sound off. Normally it comes back quick and correct but sometimes it doesn't. So there are times the speakers shut off and you lose audio. Or it will come back after half the dialog has been spoken.
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Reviewed in the United States on March 25, 2025 by David M
Nice and slim package. The power and controls are adequate. It would have been nice to have included a holding bracket to install it under a table. I made one for it and it works great.
Reviewed in the United States on April 1, 2025 by K M K M
The amp is small and light, in my use it didn't get too hot, it has two impedance ratings its compatible with 4Ohms and 8Ohms, one channel I was running a woofer rated at 150-watt power at 4 Ohms even though this amp only pushes 50 watts at that impedance the sound quality wasn't too badly affected. I used the second channel to run two small 4Ohm speakers in series and they sound great, overall I think I've used this amp to its limits, up to this point a few weeks in everything seems great. If you are looking for something small and lightweight with a very quick Bluetooth connectivity this is a good buy for the price, Cons; The turn knobs are cheap and don't line up well even if you spend time trying to, but these amps are usually hidden away, the assembly is only shown in a picture, but still, it was really easy to figure out.
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Reviewed in the United States on April 8, 2021 by Asif
The best mini amplifier on the market for the price. Made a box out of walnut with some mdf for the guts. Matted it to some 3.5 kicker drivers with tweeters and it sounds amazing. Used a 18v makita battery with a Amazon adapter and works wonders. 6ah battery should last hours. Bluetooth connects very quickly.
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Reviewed in the United States on June 29, 2024 by Crappy plastic Crappy plastic
Amp sounds great but when using the 3.5 mm input jack I here crackling. Turns out the jack was flaky. Maybe I just got a bad one. Don't know. Should be OK using bluetooth, but I can't say. I didn't try it.
Reviewed in the United States on May 9, 2024 by Amazon Customer
It works as described, but it's not that well designed. The knobs are too close to each other so it's easy to accidentally move the wrong knob, and the volume knob is small but extremely sensitive, so it's hard to get the correct volume you want. The amp takes over 10 seconds to actually turn on the aux input when you turn it on, which feels annoying when I'm used to amplifiers turning on immediately. It's also not actually that small when you consider the power supply. The power supply is separate, and so you end up with a lot of wires. Other amps may be a little bigger, but they have the power supply built-in, which I find much more convenient. If I were buying an amp like this again, I'd spend a little more for one of the Pyle models. They have built-in power supplies, better panel designs, and more features like the ability to play files off a USB stick.
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Reviewed in the United States on November 17, 2022 by Paul Slocum
I use it with a laptop charger and it has minimal noise. The sound and bass are the strongest, I connected them to 50 watt Sony speakers
Reviewed in the United States on September 29, 2024 by Raul87