Audio Amplifier Module ZK-MT21 2.1 Channel Bluetooth Digital Power Amplifier Board

I modified an old Logitech computer speaker and paired with Xiaomi TV Box and it sound amazing. I just don't really know how long it will last. But as far as the sound is concern, this is real.

Value of money 👍

The chip advertises 2x50W and a 100W sub output at 4-8ohms but only outputs around 10W at 4ohms powered with 24v DC on the subwoofer output which is much lower than the advertised 100W. The 2x50W channels also have no bass and lower output at around 4W/channel. The Bluetooth is very laggy and pops often. The ic inside is a CS8673E which can barely output 20W at 4ohms with 10% distortion which is very high. Product not as advertised.

how can i change this zkm21 in the same items they just delivered to me yesterday...when i put in the 12vpowersupply the ic starting to got burn

Artikel: HongKong-Verstärker Class D-WANGCL 2.1 - Sauberer Verstärker, klingt nicht. so muss es sein , er soll verstärken und nicht klingen oder klirren. Kein knacksen, wenn man mit Poti einschaltet. auch kein Rauschen erkennbar. So mein erster Eindruck, mit mittlerer Lautstärke. hab ihn mit 12Volt versorgt. weitere Tests auch mit 24Volt folgen. Die beigefügten Bolzen sind aus Messing, die 2 Platten vermutlich Alu-legierung. Meiner meinung nach klingt er besser als der cta-100 von Chillitec, vor allem viel mehr Power. Ruhe strom insgesamt habe ca. 1.7Watt gemessen. Test direkt, ohne Blue-tooth. (mit CD player klingt er sicher nochmal besser, als mp3, will ich noch machen, mal sehn, ob meiner noch funktioniert.) Guter Preis und gute Verarbeitung, saubere lötstellen. Subwoofer funktioniert gut, Trennfrequenz regelbar!. Der HongKong-Amp ist sauber, und recht kraftvoll. 5Sterne!

Une qualité sonore impressionnante. Tout y est; réglage des graves et des aigus, sortie stéréo plus sortie boomer, Bluetooth. configuration très simple et résultats garantis ... je recommande !

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...

Bra ljud, riktigt smidig anslutning till bluetooth. Även om 3,5mm proppen sitter i så går det att använda bluetooth. I mitt fall så har jag TV-ljudet genom denna (via sladd) och kan smidigt växla mellan bluetooth och TV:n. Det enda man får tänka på är att bluetooth:en tar över ljudet även om sladden sitter i. Ska troligen köpa någon till😉!