WANGCL Audio Versterker Module ZK-MT21 2.1 Kanaal Bluetooth Digitale Machtsversterker Board

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In my quest to find a amplifier for a DIY Bluetooth speaker on batteries i tried this tiny amplifier.Yesterday it arrived, and after assembling the tiny screws and buttons i connected a set of 4 speakers and one subwoofer.The bluetooth connection was easily set-up, and i was able to play music.I want to stick to 12v which this amp does accept, so i started to play some music, had to adjust the bass freq/lvl a bit before i noticed some bass.The quality of the audio is not very clear, almost as its being distorded, the louder i play, the worse it gets.So i was really hoping this is a power related issue, switches to a 19v 3.3A Laptop adapter instead. The speaker did NOT become louder or clearer...so if you are building a nice speaker for home use, to study or for background music, this is a fine piece of equipment.If you are building a speaker to take to a festival campsite, this wont provide you with the required volume / quality.

The class D amplifier IC's are fake CS8673E. No exposed pad on top. Buy the ZK-TB21 instead, it has Texas Instruments TPA3116D2. At 24 V is does around 75... 100 W in 4 Ohm.IC's get hot even without a load, no LC filter 🫣

WERKT GOED ? KLANK IS GOED.

The product not working . With disame power supply in the item function

I am so very happy with this little gem. A tiny box with an awesome sound. I bought it to repair my temperamental Philips 2.1 sound system. This amplifer module requires a 12 to 24 volt DC power supply. I used an old laptop PSU which was rated 19.5V @ 2.3A. Included with the amp was a 2.1mm DC power adapater with screw-terminals, making PSU connections a total doddle. Brilliant idea...Once connected to some speakers and fed with audio, it sounded absolutely great, far superior to the original Philips amplifer. Turning the shiny volume control to between 11 and 12 o'clock was plenty loud enough for my poor old speakers. Any louder and they would probably shred or melt. I really like the adjustment of tone between the sub woofer and tweeters. I quickly found the sweet spot for my system. Listening to a variety music styles from D&B to Medieval choral demonstrated just how good a tone this amp can provide. I can't hear any hiss or hum at all.After running the amp at a good listening volume for 3 hours, I found it to be just slightly warm. The laptop PSU was still cool so I have no worries about anything overheating.Just a few minor niggles - When first plugging the power jack in to the amp I got a spark. Very worrying, but no damage done. I wonder if the power jack pins are rubbing on the case. It's a very tight fit under the PCB so I removed the base plate and stuck a layer of electrical insulating tape down there just in case. The volume control doubles as the rotary power-on switch. Be aware it takes several seconds for the amp to boot up. Be warned - Dont crank up the volume immediately because you'll certainly get a sonic shock when the amp kicks in proper!! Lastly, I haven't yet found out how to disable the bluetooth 'bing-bong' sound prompt at power up. Annoying for me but maybe not for you...Overall - Impressive sound. Compact format. Bargain price. I forgive the niggles. I love it. 5-stars I'll probably buy another for the shed...

conforme a la description, bon produit

Lo uso con un semplice caricatore da telefono da 5,5V 2,4A e non sembra così tanto dispiacergli .. certo il tipo di caricatore shitec è quello che prendo ormai da anni con un bassissimo rumore di fondo ... In queste condizioni inizia a distorcere quando già dò fastidio ai vicini ... Per cui mi fermo contento così.. Ho provato le basse frequenze 10Hz-> che escono intatte anche dai canali stereo, a cui si aggiunge, ovviamente, la dinamica del subwoofer. Dunque un piccolo miracolo..