Thank you for the review. The output will be different depending on the voltage and current, but is the performance basically PC speaker amplifier? Or maybe it's a hi-fi?
Pc speaker, is a cool stuff for those who want to make a discrete soundbar or revive a old 2.1 speaker system, but because it's simple components are just a good bangforthebuck.
I'm very much loving the music track you're demonstrating the amp with. I should have checked before asking but I'm a lazy American lol. Could I get a link to that song? I'm really enjoying it! Also, I have this amp coming tomorrow. My use is going to be powering a pair of Polk Audio reference monitors in my home recording studio, along with a Bose Cinimate subwoofer. I obviously removed the power amp and crossover from the sub. Do you think this amp does a (poor, average, fair, or good) job at separating the bass from the rest? Also, thanks for the tip on the 24v power. I'm going to need to figure that out. I've got like 100,000 12v, lol but may have to pick up a 24. By the way, you're English is very good! There were only a few mispronounced words, but even they were quite easy to understand what you meant. I'm going to give you my thumb and sub+bell now. Hi! It's very nice to make your acquaintance! Thanks for the information. I had a difficult time accepting that this would sound good. It doesn't seem possible for the low price. With Amazon returns are easy, so I decided to gamble. It seems as though I made a good choice. Thanks for the reassurance. Take care, I'm going to check out some more of your content now. Great English. You speak my language far far better than I can speak yours I'm 100% certain lol.
I've learned English by myself so normally make some mistakes on basic things, but this type of feedback is a wonderful thing. My goal for the channel is make content on English for a widespread public and Portuguese,
Your speakers are HiFi grade, normally digital amplifiers doesn't have a great response in high frequency so keep it in mind if you feel that is missing when listening him.
@@soiamthemax6805 That's a really great idea doing English content to expand your market. I wish you great luck and success there. As far as my speakers. Yeah, they're fairly high end, but very old "which in my opinion is a good thing" and the sub I'm using I've bypassed the crossover and amp in, so literally just the speaker, and it's enclosure are all I'm using. Want to hear a tragic story? Imagine, an idiot in the US gets a new nifty little amp. Hooks his amp up, and is amazed at how great it sounds. He thinks "this is perfect! Now I have a 3rd sound source, for seeing how my mix sounds when producing a song. I'm going to mount this amp in a very convenient place, so I can access it quickly and easily." So, I mount it on the edge of my control desk..... right at my knee..... on the side I move towards, when standing up from my desk... well, less than 24 hours later, my dog comes running in, she gets excited when the door is open so she can come and visit. My dog is best describes as having 2 speed. Asleep, and HEEEEEYYYYYYYY!!!!! lol. So, she ripped the tiny little 3.5mm cord AND jack terminal right off the PCB! Now, bluetooth is fine, but my recording machine has no extras, just absolutely what you need to record, so it runs more smoothly. Now the amp is useless for my needs, in less than a day! I can return it to Amazon, they would take it I'm sure. But my morality will not allow me to do something I feel is dishonest. So, yeah... got any soldering tutorials laying around? lol.
@@publicprofilename4273 it will demand some soldering skills, but you can Make a cable with a p2 female plug and locate in the amp the original PCB connections for p2 plug.
@@soiamthemax6805 Let me ask, you may or may not know, that's ok either way. Let's say I find where I need to be on the PCB. provided nothing around it gets damaged, but I screw up that section pretty badly, do you think i will still have the limited functionnality I have now? I answered my own questions as I was writing it. Of course I would, since that's exactly what I've already done lol. We have a word in the US "duh" it means "obviously, stupid!" lol
hi hope you're doing well iam using the same board but it feel like left and right channel have more of a mid bass then low bass. is that s issue with mine or normal in these Amplifiers?
Obrigado brother. Gostei do review. Comprei mas depois fiquei em dúvida sobre a qualidade do amplificador, achei seu canal e curti o vídeo. Já fiz home theaters e caixas de som 2.1 mas com outro modelo. Tive problemas com o outro fornecedor e resolvi não comprar mais com ele. Comprei este modelo pra testar. Vou instalar no carro com um sub que comprei usado na olx kkkkkkkk. Gambiarra é com a gente mesmo!!!! Parabéns pelo canal, continue com os vídeos. Forte abraço.
EXCELLENT REVIEW! Great Video! I have no questions now about this. I was thinking of it being a possible answer to my problems on my Goldwing. But Now I see it may not work well because of the Power source max is 12 volts but also I think I will buy it anyway just for a thing to mess with in a car that I want a small set up in to sell. VW Bug. LOL
What do you think the max ampere that these amp could handle. Im using 24v 10amps but im getting distortion at half volume(sub). Does it really distort at half a volume or i hust got a bad product
My amp works fine until 75% of volume, after this I noticed some distortion, another important thing is the volume of input, if you use a high volume the amp will produce distortion .
I bought one ZK-MT21 recently. The chips are : BT : JL As21BP0C466-25A4 (but can not find the data sheet from JL). 4 x NE5532 OP amp. And 2 class D CS8673E. It works fine with good sound. However I faced one problem. If I connected it with AUX input, the sounds become mono not stereo. After debug for whole day. I found the EMI interference between CS8673E and BT chip. I have to disconnect the audio path (remove C15/C17 to stop BT chip output to main volume control) and input AUX audio signal into main volume controller directly. Then I can get stereo (2.1) output. Due to I only use it for desk PC audio, no need BT connection. So it's ok to disconnect BT chip output path (Also by-pass for AUX). But I am wondering, why this ZK-MT21 can't play 2.1 (become 1.1) when using AUX input? Does any one see the same problem? Or this ZK-MT21 use the worse EMI chips?
Mine is the same. Actually both of mine are the same - mono output on AUX input. I say "both" because I bought a second one assuming that I'd damaged the first one, somehow. I'm going to try the "disconnect BT chip" solution, but neither of mine have a BT chip - or it isn't connected. I purposely bought "No BT" version (the one being reviewed in this video) because for the BT version, if you don't have a bluetooth signal, the amp still looks for it anyway, producing a loud pop when it can't find a BT signal and switches over to the aux input. Not nice.
Pipo remember to use a good quality power supply, my first power supply is from a notebook, 19v 3a, after i changed to 24v 10a and the diference is clear! More quality and power!
@@soiamthemax6805 sorry, it was 15V 5A, meaning a 75W power supply will definitely unable to give this amp its full potential. I have the volume currently at 40% but I can hear quality. 😊
Any idea to help me out? I tried with mid range speakers L/R and a small 30w ayima 3inch subwoofer. I used first 12v power supply and then tries 20v. both times midrange works great but subwoofer doesn't work right it sounds weird and warms up really quickly and with the 20v it blew little smoke also... Is the amp bad or what could be the problem?
First thing to take attention is power supply, use 24v 10A power supply. Second thing is check impedance of the speakers, third check the amp if there is thermal paste and remember to not overtight or it can cause a shortcut.
@@soiamthemax6805 For some reason, i tried to connect the woofer to Left speaker channel and it worked perfectly. With 20v power bass was little stronger but both worked. I might just get a passive lpf and use the speaker channels in parallel. Could there be something wrong with the sub port on the amp 🤔
My power supply is 24v 10a honeycomb model, gets hot after some time playing, nothing to care about. I use at a volume of 50% my room is small so it is enough for me. Never used for a long period at high volume.
@@soiamthemax6805 thank you! I have a 14.4 with 5 amp, mine will arrive on 9th march. I was scared about overheating from such a tiny amp, but if you say that 24v is good, that means i will be fine with 14v i guess.
@@lucianmehedinteanu as low the voltage more hot the amp will be, since this amp doesn't have a power supply, work directly with the power supply tension.
Comprei uma destas coisinhas com altas esperanças que pudesse obter um som bom no meu sistema de "teatro em casar." O canal de sub funciona razoavelmente com distorção mínima e controlável, mas não produze som nenhum nos satélites. Pois seu sistema funciona bem, tenho que concluir que meu aparelho chegasse quebrado. Não tinha como verificar os componentes. Seu vídeo leva a coragem de comprar um novo mini-amp e tentar de novo.
Hey man great video! I somehow get it to work but after 2 minutes it starts to cut off and on non-stop, i tried to change my power supply but the problem persist
@@soiamthemax6805 I'm with a 19volts 3.42A power supply, someone told me I should try with a 12v 10A because apparently this amp is very demanding, what do you think of that ?
@@jebam3414 this amp works great on 24v 10a, my first power supply is a notebook power supply 19v 3a, the amplifier makes the power supply trip due to the overcourent protection. I strongly recommend the 24v 10a power supply.😉
If you use the RCA audio output from the cinema amp as a audio source for the zk mt21 must be everything ok. But keep in mind to never use the amplified channels as a audio source.
No, TB 21 have a filter for electrical interference, also have more protection freatures like undervoltage etc. I have listened both and don't noticed any difference.
@@sergg2711 you can only change the alias of the device in your phone, if you search for the amp using a different phone the factory name will be show.
quality is good, not the same as a hifi system like the 2.0 that i have, but is a bangforthebuck in my opinion. the only thing to consider is a good quality power supply or the ripple will affect the sound.
@@rodjenkinson9406 correct, no ripple since there is no switching circuit converting ac to dc, tested with two 12v bat. in series and worked awesome but is up to you chose the best for your case. by the way at 12v the amp dont reach its rated power.
@@JonathanLopez-tw8ef if you want more power use 24v 10amps, this type of amplifier have a direct relation so if you want to reach the 200wrms output need at least 24v.
Can i use a 135w laptop charger as a power supply? It outputs 20v and 6.75A
Yes
DC right?
Thank you for the review. The output will be different depending on the voltage and current, but is the performance basically PC speaker amplifier? Or maybe it's a hi-fi?
Pc speaker, is a cool stuff for those who want to make a discrete soundbar or revive a old 2.1 speaker system, but because it's simple components are just a good bangforthebuck.
I'm very much loving the music track you're demonstrating the amp with. I should have checked before asking but I'm a lazy American lol. Could I get a link to that song? I'm really enjoying it! Also, I have this amp coming tomorrow. My use is going to be powering a pair of Polk Audio reference monitors in my home recording studio, along with a Bose Cinimate subwoofer. I obviously removed the power amp and crossover from the sub. Do you think this amp does a (poor, average, fair, or good) job at separating the bass from the rest? Also, thanks for the tip on the 24v power. I'm going to need to figure that out. I've got like 100,000 12v, lol but may have to pick up a 24. By the way, you're English is very good! There were only a few mispronounced words, but even they were quite easy to understand what you meant. I'm going to give you my thumb and sub+bell now. Hi! It's very nice to make your acquaintance! Thanks for the information. I had a difficult time accepting that this would sound good. It doesn't seem possible for the low price. With Amazon returns are easy, so I decided to gamble. It seems as though I made a good choice. Thanks for the reassurance. Take care, I'm going to check out some more of your content now. Great English. You speak my language far far better than I can speak yours I'm 100% certain lol.
I've learned English by myself so normally make some mistakes on basic things, but this type of feedback is a wonderful thing. My goal for the channel is make content on English for a widespread public and Portuguese,
Your speakers are HiFi grade, normally digital amplifiers doesn't have a great response in high frequency so keep it in mind if you feel that is missing when listening him.
@@soiamthemax6805 That's a really great idea doing English content to expand your market. I wish you great luck and success there. As far as my speakers. Yeah, they're fairly high end, but very old "which in my opinion is a good thing" and the sub I'm using I've bypassed the crossover and amp in, so literally just the speaker, and it's enclosure are all I'm using. Want to hear a tragic story? Imagine, an idiot in the US gets a new nifty little amp. Hooks his amp up, and is amazed at how great it sounds. He thinks "this is perfect! Now I have a 3rd sound source, for seeing how my mix sounds when producing a song. I'm going to mount this amp in a very convenient place, so I can access it quickly and easily." So, I mount it on the edge of my control desk..... right at my knee..... on the side I move towards, when standing up from my desk... well, less than 24 hours later, my dog comes running in, she gets excited when the door is open so she can come and visit. My dog is best describes as having 2 speed. Asleep, and HEEEEEYYYYYYYY!!!!! lol. So, she ripped the tiny little 3.5mm cord AND jack terminal right off the PCB! Now, bluetooth is fine, but my recording machine has no extras, just absolutely what you need to record, so it runs more smoothly. Now the amp is useless for my needs, in less than a day! I can return it to Amazon, they would take it I'm sure. But my morality will not allow me to do something I feel is dishonest. So, yeah... got any soldering tutorials laying around? lol.
@@publicprofilename4273 it will demand some soldering skills, but you can Make a cable with a p2 female plug and locate in the amp the original PCB connections for p2 plug.
@@soiamthemax6805 Let me ask, you may or may not know, that's ok either way. Let's say I find where I need to be on the PCB. provided nothing around it gets damaged, but I screw up that section pretty badly, do you think i will still have the limited functionnality I have now? I answered my own questions as I was writing it. Of course I would, since that's exactly what I've already done lol. We have a word in the US "duh" it means "obviously, stupid!" lol
hi hope you're doing well iam using the same board but it feel like left and right channel have more of a mid bass then low bass. is that s issue with mine or normal in these Amplifiers?
Obrigado brother. Gostei do review. Comprei mas depois fiquei em dúvida sobre a qualidade do amplificador, achei seu canal e curti o vídeo. Já fiz home theaters e caixas de som 2.1 mas com outro modelo. Tive problemas com o outro fornecedor e resolvi não comprar mais com ele. Comprei este modelo pra testar. Vou instalar no carro com um sub que comprei usado na olx kkkkkkkk. Gambiarra é com a gente mesmo!!!! Parabéns pelo canal, continue com os vídeos. Forte abraço.
Eu instalei um desse com um stepup 12/24 em um carro e ficou top. Recomendo.
I use these in building portable Bluetooth speakers. they are wonderful.
I have had this for 2 weeks an can find a power plug. Please tell me where I can get a power plug
EXCELLENT REVIEW! Great Video! I have no questions now about this. I was thinking of it being a possible answer to my problems on my Goldwing. But Now I see it may not work well because of the Power source max is 12 volts but also I think I will buy it anyway just for a thing to mess with in a car that I want a small set up in to sell. VW Bug. LOL
Do you know if there is an app to rename the bluetooth or add password?
How about connecting two subwoofer speaker each of 50w in parallel, or series, which is better to the subwoofer pot
Hi.
I got this product too .
Everything sounds good.
But my power blue light is flashing..
Dont know why.
I use a 12v 8a adapter.
Maybe 24v better.?
Thing you will find it turns solid when bluetooth paired!
What do you think the max ampere that these amp could handle. Im using 24v 10amps but im getting distortion at half volume(sub). Does it really distort at half a volume or i hust got a bad product
My amp works fine until 75% of volume, after this I noticed some distortion, another important thing is the volume of input, if you use a high volume the amp will produce distortion .
My tests the amp draw only 7,5 amps in 24v
I bought one ZK-MT21 recently. The chips are : BT : JL As21BP0C466-25A4 (but can not find the data sheet from JL). 4 x NE5532 OP amp. And 2 class D CS8673E.
It works fine with good sound. However I faced one problem. If I connected it with AUX input, the sounds become mono not stereo. After debug for whole day. I found the EMI interference between CS8673E and BT chip. I have to disconnect the audio path (remove C15/C17 to stop BT chip output to main volume control) and input AUX audio signal into main volume controller directly. Then I can get stereo (2.1) output. Due to I only use it for desk PC audio, no need BT connection. So it's ok to disconnect BT chip output path (Also by-pass for AUX). But I am wondering, why this ZK-MT21 can't play 2.1 (become 1.1) when using AUX input?
Does any one see the same problem? Or this ZK-MT21 use the worse EMI chips?
my mt21 works stereo (2.1) on p2, and the chips JL is pretty common for Bluetooth audio.
your amp does not have the "wuziaudio chip"??
Had the same issue, did you find any other solution?
@@soiamthemax6805
mine has Wuzhi Audio brand
aux is mono.
Mine is the same. Actually both of mine are the same - mono output on AUX input. I say "both" because I bought a second one assuming that I'd damaged the first one, somehow. I'm going to try the "disconnect BT chip" solution, but neither of mine have a BT chip - or it isn't connected. I purposely bought "No BT" version (the one being reviewed in this video) because for the BT version, if you don't have a bluetooth signal, the amp still looks for it anyway, producing a loud pop when it can't find a BT signal and switches over to the aux input. Not nice.
my power supply is 24.8v. and 5A.if I supply this voltage,will occur to burnout the amplifier TB21?.
Yes, since the Chipset maximum voltage is 24v
@@soiamthemax6805 ok thanks!..
i"m using 15V5A power supply but there is too much distortion. I have ordered 24V 9A supply and it's on the way. Hopefully power will be enough.
Pipo remember to use a good quality power supply, my first power supply is from a notebook, 19v 3a, after i changed to 24v 10a and the diference is clear!
More quality and power!
@@soiamthemax6805 sorry, it was 15V 5A, meaning a 75W power supply will definitely unable to give this amp its full potential. I have the volume currently at 40% but I can hear quality. 😊
Can i install this MT21 Board in my Car? 12V
Hi guys? I need help my zk-mt21 keeps on turnin on and off.
How can i fix this.
Im using 19volts 3.41A
Try unplugging everything except the supply, and see if they continue clipping, have you tried another power supply?
you get better results if you use better speaker ! this little thing sound really nice !
Any idea to help me out? I tried with mid range speakers L/R and a small 30w ayima 3inch subwoofer. I used first 12v power supply and then tries 20v. both times midrange works great but subwoofer doesn't work right it sounds weird and warms up really quickly and with the 20v it blew little smoke also... Is the amp bad or what could be the problem?
First thing to take attention is power supply, use 24v 10A power supply. Second thing is check impedance of the speakers, third check the amp if there is thermal paste and remember to not overtight or it can cause a shortcut.
@@soiamthemax6805 For some reason, i tried to connect the woofer to Left speaker channel and it worked perfectly. With 20v power bass was little stronger but both worked. I might just get a passive lpf and use the speaker channels in parallel. Could there be something wrong with the sub port on the amp 🤔
@@afropkerz as a "cheap" product quality control maybe don't exist 😅. Have you checked the board of amplifier?
Hi, does it get hot when you play for more hours and what type of supply do you use. Can you tell me, please?
My power supply is 24v 10a honeycomb model, gets hot after some time playing, nothing to care about.
I use at a volume of 50% my room is small so it is enough for me. Never used for a long period at high volume.
@@soiamthemax6805 thank you! I have a 14.4 with 5 amp, mine will arrive on 9th march. I was scared about overheating from such a tiny amp, but if you say that 24v is good, that means i will be fine with 14v i guess.
@@lucianmehedinteanu this amp works great on 24v when powered with a lower tension overheat more than expected.
@@soiamthemax6805 hi, do you mean it will be hotter or it will be cooler with 14.4 V?
I think it should be cooler with lower voltage.
@@lucianmehedinteanu as low the voltage more hot the amp will be, since this amp doesn't have a power supply, work directly with the power supply tension.
Can this amplifiers in non active studio monitor speakers?
IC chip tpa3116d2 or chip domestic?
Comprei uma destas coisinhas com altas esperanças que pudesse obter um som bom no meu sistema de "teatro em casar." O canal de sub funciona razoavelmente com distorção mínima e controlável, mas não produze som nenhum nos satélites. Pois seu sistema funciona bem, tenho que concluir que meu aparelho chegasse quebrado. Não tinha como verificar os componentes. Seu vídeo leva a coragem de comprar um novo mini-amp e tentar de novo.
Would it last long for 5 hours?
Since you keep ventilated, yes.
My amplifier runs all day long with no problem.
Hey man great video! I somehow get it to work but after 2 minutes it starts to cut off and on non-stop, i tried to change my power supply but the problem persist
24volts power supply?
@@soiamthemax6805 I'm with a 19volts 3.42A power supply, someone told me I should try with a 12v 10A because apparently this amp is very demanding, what do you think of that ?
@@jebam3414 this amp works great on 24v 10a, my first power supply is a notebook power supply 19v 3a, the amplifier makes the power supply trip due to the overcourent protection. I strongly recommend the 24v 10a power supply.😉
@@soiamthemax6805 ok I see thank you so much I will try that !
12volt and more ampere.. min 10 ampere and more
24v 4a Will it work without problems?
Have u found a power plug for I. I can't an nobody will tell u. Had for 2 weeks an can find a power plug that works
Can you plug this into the back of a cinema amp via rca ?
If you use the RCA audio output from the cinema amp as a audio source for the zk mt21 must be everything ok. But keep in mind to never use the amplified channels as a audio source.
@@soiamthemax6805 so basically just use it for the subwoofer as is my intention 👍
@@mrbakebean will works fine.
HOW DO YOU SHIFT THE MODE? BLUETOOTH TO AUX AND AUX TO BLUETOOTH
Bluetooth have priority so if you connect Bluetooth during the use of auxiliary input the audio from Bluetooth was the one that will be playing.
Where could I find an assembly guide for this?
Excelent question, tonight I will record and upload a video for you 😃, see the channel for the video.
Vídeo posted i hope you have a great time assembling your amp.
is this better than TB21 (3116) ?
No, TB 21 have a filter for electrical interference, also have more protection freatures like undervoltage etc.
I have listened both and don't noticed any difference.
@@soiamthemax6805 oh okok thanks 😊for info.
Can you put a video of the amplifier working with speakers?
I was thinking in make one bookshelf speaker for this. Coming soon I will upload the video.
@@soiamthemax6805 how to change bluetooth name?
@@sergg2711 you can only change the alias of the device in your phone, if you search for the amp using a different phone the factory name will be show.
2х, 3х омные динамики можно подключать?
minimum impedance is 4 Ohms. if you use the speakers in series connection in one channel the impedance will be 6 Ohms but is up to you.
great video bro
Tks🤛
Can I Power supply it with 12 0 12 transformer
Don't try this, this amp works only with DC.
sound is good or not for you ?
quality is good, not the same as a hifi system like the 2.0 that i have, but is a bangforthebuck in my opinion. the only thing to consider is a good quality power supply or the ripple will affect the sound.
@@soiamthemax6805 If I power it with 12v DC from a car battery, there should be no ripple effect. Is that correct?
@@rodjenkinson9406 correct, no ripple since there is no switching circuit converting ac to dc, tested with two 12v bat. in series and worked awesome but is up to you chose the best for your case. by the way at 12v the amp dont reach its rated power.
Aux input is MONO in this amplifier.. 😢
yeah, did you fix yours?
how?
@@emsayonachi9300 no
ZkHt21 please review it also thanks
यहां इमपिली फ्री फायर का क्या रेट है
i cant read your comment, try English if possible.
Rs.2500 on Amazon.1500 on banggod
Wuzhi Audio ZK TB 21is better.
Усилитель не выдает 200Вт, очень плохой усилитель.
you re right, tested this week and just at maximum 150w.
@@soiamthemax6805 at what ohm ,voltage, and amps draw did you test at .
@@JonathanLopez-tw8ef L&R speakers are 8Ohms subwoofer is 4 Ohm First power supply is 24v 3A, but now I use 24v 10A power supply.
@@soiamthemax6805 I power mine with 15 volt 60 amps sound good
@@JonathanLopez-tw8ef if you want more power use 24v 10amps, this type of amplifier have a direct relation so if you want to reach the 200wrms output need at least 24v.
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