This is a poor test with a bare speaker. As the diaphragm moves forward compressing the air at the front the pressure at the rear is reduced. The effect of this is to make the sound thin and tinny with much reduced bass. A speaker needs to be in an enclosure to keep these two opposing sound waves separated. You could say it’s like an audio short circuit. Some speaker enclosures are completely sealed while others have a tuned length of pipe connected to a rear port known as a bass reflex port for better bass.
I bought the 2*15w you showed just before the last one and it's great the sound is very clean and the voice notification it helps to know when someone is calling and low battery as well
3:40. I have ordered that board for a project. I am going to have a look at editing the Bluetooth settings and if I get any success with re-programming the Bluetooth controller I will make a video showing what to do.
@@james_robertson not sure if you even still care, but I believe buying the amp and programming the bluetooth chip yourself will be easier and sound better
You usually have to solder a 3-4inch wire onto the Bluetooth PCB antenna to get rid of the noise you experience. It's an easy fix on these cheap boards.
@@TheRealBobbysmile not really. I'm an electronic engineer. I just do it myself. Basically take a 3 inch length of insulated single core wire (it's more rigid and can be bent where you want it). Solder it to the end of the Bluetooth antenna on the board. The antenna is the zigzag shaped trace (the inverted F antenna). It dramatically reduces noise from these cheap boards.
I really like the way how you explained about Bluetooth and their qualities. Please keep on going, 'cause, I'll be expecting more of this sort from you in future. May the Good Lord helps you in your every needs
i bought the smallest one that is 12w r , 12w l , sounds god damn good , but sure is loud as at startup you have no volume controle, beside that, its pretty nice , i used speakers from 2 dead boomboxes , speakers were A1 so its a nice cheap project with recycled parts , i also used recycled cables from the boomboxes i recycled , great quality stuff even tho its from the 80's , thinking about it, its 40 years old speakers and its still beating some new ones lol
Your test speaker is operating in free air which is not how the speaker was designed to work. Sound quality and output are poor. You have two desktop speakers in front of you, why not use them for testing instead.
My best buy is like the last one in some new revision with a blue board. From Sanwa i think. No noise, powerfull, very last long with a 12v battery. Love it.
i own 10 boards like the first one and i can tell you that they work super fine,they are from a different brand without that voice when starts and the soud is cristal clear of course all depends of the mp3 quality and player that you use,after seeing this video i fill lucky to have the first board but from a different brand
I just want to say thank you for having the title in English and actually speaking English. I gave you a like for that reason. It doesn't cover the amplifier board i have however. All the other videos I have found on the board I have, have the title in English but they speak some foreign language and I HATE it when people do that. I consider them "clickbait".
Hi there I have the TDA7492 board and it sounds very good, indeed with no Bluetooth noise. But I have this board in 2 flavors one is on red PCB the other on a blue PCB. The blue one has horrendous Bluetooth noise and is very bad a low volumes. I think it really is the luck of the Draw with these boards. I'm taking mine to my electronics specialist for further diagnosis.
If there would be a way how to turn off the voice notifications, or just exchange them for various beeps, I'd buy the cheap ones - for small, in-room speakers :)
I too would LOVE to know how to do this! It would make them a much more useable product! Maybe you could test if this trick works? hold + and - volume simultaneously until a beep sounds, which indicates that voice prompts are disabled. Apparently it works for many bluetooth speakers/brands. Obviously will only work with amps that have buttons! Cheers
@@michaelhanley9966 WOW! Thanx! Many no name bluetooth devices have these same voice prompts and are annoying to say the least. My car bluetooth add on has the same bad english prompts. I'll try it and let you know if it works.
I dont know why you guys dont use speaker cabinets? Its not possible to measure the quality of sound with just a woofer on the table. This kind of test requires an acoustic box with a woofer, a silk dome tweeter and a passive crossover board. Also, when testing bluetooth boards you need to take some distance, a few meters, to see if the card does not lose connection and interrupts the sound.
I compared the tda7492p with a sony STR-DH190 stereo amplifier and didn’t hear any significant difference soundwise. The tda7492p didn’t have any background noise. Maybe in your case it was caused by the powersource?
I got the last one from banggood a year ago. The sound is not terrible but not good either, lacking bass and a bit high on the mids. it's loud with 8ohm speakers and actually not bad overall if you don't care about audio quality, but need volume.
If u want to know if a Bluetooth board is good u should use the recommended voltage and current not just powering them on with a wrong power supply and say they make noice, that's a good way to test em
Can you do an update video on other Bluetooth audio amplifier boards you didn't cover. Specifically ones for smaller projects like the DW-CT14+, PAM8406, i.e. boards that can run off 3.7V lipo battery voltage, thanks.
Since this is an older video, I don’t know if you still need help getting rid of the voice or changing the BT Name of the devices. I know how for sure on the 15W one with good audio quality. You can even change EQ modes on it for better sound. It defaults to a flat EQ.
hi, i have daisy chained some tao tronics bluetooth transmitters, only to lose one half of the audio signal when i did. i found that i could get stereo with multiple transmitters, if i had only one bluetooth headphone paired to it. i think it may be the quality of the splitter im using. but my ask to you is, is there a way to see the channels that each transmitter is using when pairing? i havent been able to find any type of multi unit BT transmitter, and tao tronics hasnt been able to tell me how to get inside their devices. maybe theres a way to build something that will be configurable to the point of limiting BT channels to specific transmitters? maybe even being able to have confidence when unpairing a BT headset, without relying on device code lights on the transmitter. i figured that there could be some way to make a device that can transmit to more than 2 BT devices, by using more than one transmitter. thanks mark
i like to do a bluetooth amplifier for my car and don't use any kind of radio car devices, only connect my speakers at my car and my phone. ¿any recomendation? thank you. :-)
Pick the first one, power it by the lighter with a usb cable. Solder the wires for the speakers on the back witch it's labeled and voila! you have car audio amplified with bluetooth on a cheap. I have currentely a pam8403 with speakers wired. gonna buy that one to add the bluetooth function.
sorry.. but u know price is quality. cheap price good quality, i think is stupid. and please use good quality power suply. noise from bad power suply & bad cable
I didn't get any of those crappy ones but I did find one that has been built real nice and was put on a dyno tester and it came pretty close to all specs. It's 4 in by 3 in. Runs at 33 volts DC. And there is a TH-cam channel showing it on the dyno. And it was my first board that I bought without even looking at TH-cam. So I look at this TH-cam video in the beginning to see what he had laid out and I didn't see mine so I knew this were going to be crap I ended up with a 7498e
is there an way to just only use the Bluetooth part. that you sent the sound too a proper amplifier. i,m searching for a Bluetooth device that can send aux singnal to my amplifer that i already have that works whit 12v volt.
There are boards with DSP that can separate frequencies, but they aren't cheap. The alternative is to use a crossover or a high-pass filter. The cheapest option is to use a capacitor in series with the tweeter.
Hi, I've seen videos like this one showing how some CSR chip boards can be renamed th-cam.com/video/iH4nvMi7Zsk/w-d-xo.html But I've never tried it. You need a special tool too
Don't forget that you can rename them in your phone. However, this only changes how your phone sees the device. It doesn't change the name saved on the board itself. But it's something
hello buddy, thanks for the great video... but i have a question...what quality bluetooth adaptor would you recomend me to connect to a classic music system sony grx70 ?, is it worth it to connect a BT adaptor that supports LDAC o aptX HD that i can buy on aliexpress(there so many that i cannot decide)?, I want to transmit a better quality sound from my smartphone thru TIDAL, and also making config to my phone... is it possible to notice a better hifi quality sound if I do what I have planned?.. thank you , cheers!
hi there. Im planning to do the same thing to my old speakers, do you mind telling me what solution you came up with. I'm thinking of buying a cheap bluetooth receiver to connect to auxiliary but i'm not sure whether the sound quality is affected or not. Thank you for your time!
All of beepeng noises come from your power adapter, lol.... You must use smps adapter with stabilized and filtered voltage output... Beeping my ass....
I would stay away on those devices with JLxxx or Beken based Bluetooth module. They all include those Chinese lady voices thing. "dah bluetoh devwise is connecteded uh successfulleh" at full volume.
@@LeftyMaker The voice! I remember watching your reviews as a teen when I was deciding on which phones to buy :). Sorry in case ppl mention it a lot, this is the first time I've stumbled upon your channel, very interesting!
That's cool! You're actually the first one to say they recognized me. I still work at PA, just doing very different stuff now, and TH-cam is just for fun. Hope you like the videos and thanks for watching! :)
This is what i exactly looking for. Thank you so much for this video. I use 7492p 50w amp board in this video. Now i am looking for XH-A354 20w amp board which have yamaha amplifier chip. Could you please test and give your opinion
Only the two I linked to in the description are kind of okay. Not perfect, but good enough. But I can only recommend using them with 8 ohms because they don't have a heatsink and get warm.
@@LeftyMaker I have received some of these just yesterday: www.aliexpress.com/item/32985655660.html $1.50 a pop. Very decent audio quality, no weird language, only a 1-second long tone when powered on and when paired. Can recommend. EDIT: also tested the one with integrated stereo 5W amplifier. Issues to report: 1. there is nothing in low end frequency. Kinda understandable why they did it, as there are no caps on 5V rail to support the current peaks. 2. pops and clicks between audio tracks, or between words and sentences on a podcast. Looks like it enters some kind of sleep mode when there's a silence for half a second, and the switching is poorly implemented, likely on AC coupling between receiver and amplifier chips. The headphone one seems pretty decent though.
![DIY Bluetooth Speaker [Bose Wave Unit] 블루투스 스피커 만들기](http://i.ytimg.com/vi/hstCu2O4od4/mqdefault.jpg)
![[TH] 2024 PMSL SEA W2D1 | Fall | ต่อเนื่อง ในสัปดาห์สอง](http://i.ytimg.com/vi/ElcO9uC_Dbk/mqdefault.jpg)
This is a poor test with a bare speaker. As the diaphragm moves forward compressing the air at the front the pressure at the rear is reduced. The effect of this is to make the sound thin and tinny with much reduced bass. A speaker needs to be in an enclosure to keep these two opposing sound waves separated. You could say it’s like an audio short circuit. Some speaker enclosures are completely sealed while others have a tuned length of pipe connected to a rear port known as a bass reflex port for better bass.
I bought the 2*15w you showed just before the last one and it's great the sound is very clean and the voice notification it helps to know when someone is calling and low battery as well
3:40. I have ordered that board for a project. I am going to have a look at editing the Bluetooth settings and if I get any success with re-programming the Bluetooth controller I will make a video showing what to do.
* I was unable to turn off the voice prompt but I could re name it. ( Video is currently uploading)
Please share if you able to turn off the chinglish notification. thanks.
@@james_robertson not sure if you even still care, but I believe buying the amp and programming the bluetooth chip yourself will be easier and sound better
You usually have to solder a 3-4inch wire onto the Bluetooth PCB antenna to get rid of the noise you experience. It's an easy fix on these cheap boards.
Do you have a link to any more info on this? Interested in trying it for my cheap receiver
@@TheRealBobbysmile not really. I'm an electronic engineer. I just do it myself. Basically take a 3 inch length of insulated single core wire (it's more rigid and can be bent where you want it). Solder it to the end of the Bluetooth antenna on the board. The antenna is the zigzag shaped trace (the inverted F antenna). It dramatically reduces noise from these cheap boards.
@@TheDradge great, thanks I'll have to give it a go. Got some single core in a draw somewhere I'm sure
Bro please tell me how to solder it
I really like the way how you explained about Bluetooth and their qualities.
Please keep on going, 'cause, I'll be expecting more of this sort from you in future.
May the Good Lord helps you in your every needs
i bought the smallest one that is 12w r , 12w l , sounds god damn good , but sure is loud as at startup you have no volume controle, beside that, its pretty nice , i used speakers from 2 dead boomboxes , speakers were A1 so its a nice cheap project with recycled parts , i also used recycled cables from the boomboxes i recycled , great quality stuff even tho its from the 80's , thinking about it, its 40 years old speakers and its still beating some new ones lol
the unwelcome noise probably Comes from your powersiplys as they have no filtering.
Your test speaker is operating in free air which is not how the speaker was designed to work. Sound quality and output are poor. You have two desktop speakers in front of you, why not use them for testing instead.
U right
My best buy is like the last one in some new revision with a blue board. From Sanwa i think. No noise, powerfull, very last long with a 12v battery. Love it.
Nice, I should give it a try. I think you're right. Some revisions of these boards could sound better
i own 10 boards like the first one and i can tell you that they work super fine,they are from a different brand without that voice when starts and the soud is cristal clear of course all depends of the mp3 quality and player that you use,after seeing this video i fill lucky to have the first board but from a different brand
Cool! Do you have a link or a store name?
@@LeftyMaker its a dollatek brand www.amazon.es/dp/B07DK1J9HS/ref=cm_sw_r_wa_apa_i_TDzIEbSKYQPKD
Thank you! I learned more than expected from this video! Liked and Subscribed.
I just want to say thank you for having the title in English and actually speaking English. I gave you a like for that reason. It doesn't cover the amplifier board i have however. All the other videos I have found on the board I have, have the title in English but they speak some foreign language and I HATE it when people do that. I consider them "clickbait".
Thanks! What is the board you have? I have since bought a few more, but I haven't covered them in a video
@@LeftyMaker It's a TPA3110 XH-A232 30W+30W 2.0 channel digital stereo power amplifier board. I bought it from Aliexpress.
Hi there I have the TDA7492 board and it sounds very good, indeed with no Bluetooth noise. But I have this board in 2 flavors one is on red PCB the other on a blue PCB. The blue one has horrendous Bluetooth noise and is very bad a low volumes. I think it really is the luck of the Draw with these boards. I'm taking mine to my electronics specialist for further diagnosis.
Amazing, you are a crisp engineer for sure. Thanks a lot, I am a software engineer but trying my childhood hobby in lockdown.. Thankyou tc
If there would be a way how to turn off the voice notifications, or just exchange them for various beeps, I'd buy the cheap ones - for small, in-room speakers :)
Apparently, the CSR chips can be reprogrammed with a special tool. I'm looking into it.
@@LeftyMaker Looking forward to your follow-up video then :)
I too would LOVE to know how to do this! It would make them a much more useable product!
Maybe you could test if this trick works? hold + and - volume simultaneously until a beep sounds, which indicates that voice prompts are disabled. Apparently it works for many bluetooth speakers/brands. Obviously will only work with amps that have buttons! Cheers
@@michaelhanley9966 didn't know that. Let me test this tomorrow with the boards that I have.
@@michaelhanley9966 WOW! Thanx!
Many no name bluetooth devices have these same voice prompts and are annoying to say the least. My car bluetooth add on has the same bad english prompts. I'll try it and let you know if it works.
4:00 is the best one here, I've used it before and it's great
I dont know why you guys dont use speaker cabinets? Its not possible to measure the quality of sound with just a woofer on the table. This kind of test requires an acoustic box with a woofer, a silk dome tweeter and a passive crossover board. Also, when testing bluetooth boards you need to take some distance, a few meters, to see if the card does not lose connection and interrupts the sound.
The second one's amplifier ic is pam8403
The noise is normal because there is no potentiometer between the bt receiver and amplifier
I compared the tda7492p with a sony STR-DH190 stereo amplifier and didn’t hear any significant difference soundwise. The tda7492p didn’t have any background noise. Maybe in your case it was caused by the powersource?
wouldnt it be more cost effective to just buy a small hifi system second hand? as long as you dont mind the space they take
I got the last one from banggood a year ago. The sound is not terrible but not good either, lacking bass and a bit high on the mids. it's loud with 8ohm speakers and actually not bad overall if you don't care about audio quality, but need volume.
Wow thank you so much for your efforts. This video really points me to the right direction.
Not defending amps... but you actually need some enclosure for the speaker.... also speakers play a big roll.
it would be best if you test amplifier board in dark enclosures, light has big impact on the hissssss sound by most boards
The Bluetooth dewise is rid too pale.
The Bluetooth dewise, as connected does successfully.
Does the last one support IR remote
If u want to know if a Bluetooth board is good u should use the recommended voltage and current not just powering them on with a wrong power supply and say they make noice, that's a good way to test em
The noise couod be removed by using capacito4 i think
Very good & clear explanation. Thanks a lot.
Thank you for this video!
It's normal the make noice if u didn't use the recommended voltage and current
Thank you this is a great video I was planning on buying some of these boards and doing my own builds to shoot some videos myself.
Can you do an update video on other Bluetooth audio amplifier boards you didn't cover. Specifically ones for smaller projects like the DW-CT14+, PAM8406, i.e. boards that can run off 3.7V lipo battery voltage, thanks.
Since this is an older video, I don’t know if you still need help getting rid of the voice or changing the BT Name of the devices. I know how for sure on the 15W one with good audio quality. You can even change EQ modes on it for better sound. It defaults to a flat EQ.
hi, i have daisy chained some tao tronics bluetooth transmitters, only to lose one half of the audio signal when i did. i found that i could get stereo with multiple transmitters, if i had only one bluetooth headphone paired to it. i think it may be the quality of the splitter im using. but my ask to you is, is there a way to see the channels that each transmitter is using when pairing? i havent been able to find any type of multi unit BT transmitter, and tao tronics hasnt been able to tell me how to get inside their devices. maybe theres a way to build something that will be configurable to the point of limiting BT channels to specific transmitters? maybe even being able to have confidence when unpairing a BT headset, without relying on device code lights on the transmitter. i figured that there could be some way to make a device that can transmit to more than 2 BT devices, by using more than one transmitter.
thanks
mark
I add bt module to amplifier board without inbuilt bt .... amplifier board attached to seprate bt module will get all the annoying noises off
i like to do a bluetooth amplifier for my car and don't use any kind of radio car devices, only connect my speakers at my car and my phone. ¿any recomendation? thank you. :-)
Pick the first one, power it by the lighter with a usb cable.
Solder the wires for the speakers on the back witch it's labeled and voila! you have car audio amplified with bluetooth on a cheap.
I have currentely a pam8403 with speakers wired. gonna buy that one to add the bluetooth function.
Tell me which board good for sound bars
You have done good job, but compared 5v with 12v.
sorry.. but u know price is quality. cheap price good quality, i think is stupid. and please use good quality power suply. noise from bad power suply & bad cable
great Thanx i realy neded to see the diference Thanx again:)
I had almost all of them i use without bt board if you use phone charger it will pick hisssss noise use 3.7 lithium ion....
3:50 - Sounds okay, maybe if it was faster.
I didn't get any of those crappy ones but I did find one that has been built real nice and was put on a dyno tester and it came pretty close to all specs. It's 4 in by 3 in. Runs at 33 volts DC. And there is a TH-cam channel showing it on the dyno. And it was my first board that I bought without even looking at TH-cam. So I look at this TH-cam video in the beginning to see what he had laid out and I didn't see mine so I knew this were going to be crap
I ended up with a 7498e
any updates 2 years later ?
last board (2x50w) How do you switch to LINE-IN? Seems only to work with bluetooth?
Just build a box for the speaker
What about the yamaha yda-138 amplifier chip or module.
so all of them make hissing noise! is there any budget amps that don't have this problem ?
You should put your speaker in the sound box. Of course it will hiss too much cuz of it's open body..
So why doesn't it hiss with two of the six amps?
Can these circuit boards be programmed via Arduino in order to control (like play, pause, skip song, volume up) music from smartphones? Thank you!
Very good video. Can you advise any good ones that can use 9 to 12V DC?
have you tried the WONDOM JAB3 100 watt? its the best out with all accessories tho its pricey but the best.
do you know any boards that mutilink. the TSA2300 does but i dont know if its any good
3:50 I never seen before Bluetooth voice
Tell me how to filter that cracks sound
Great review
is there an way to just only use the Bluetooth part. that you sent the sound too a proper amplifier. i,m searching for a Bluetooth device that can send aux singnal to my amplifer that i already have that works whit 12v volt.
One of my recent videos covers your question: th-cam.com/video/DMy2RXD5slc/w-d-xo.html
Thank you
I have the 6+6w amplifier board and it clips horribly at 70% volume, its really bad
Nice video!
Which country are you from brother?
Thank you for this video. I just thought about putting this kind of aliexpress bluetooth module to old radio. Now i know it's not the best solution.
How many watts are your speaker
is there any budget board with tweeter connections ?
There are boards with DSP that can separate frequencies, but they aren't cheap. The alternative is to use a crossover or a high-pass filter. The cheapest option is to use a capacitor in series with the tweeter.
3 volume amp good
This video really helpful ❣️💓
Is there any bluetooth board that we can change the bluetooth name? Like living room, study and bedroom.
Hi, I've seen videos like this one showing how some CSR chip boards can be renamed th-cam.com/video/iH4nvMi7Zsk/w-d-xo.html But I've never tried it. You need a special tool too
@@LeftyMaker Thank you for the reply and link. Very useful.
Don't forget that you can rename them in your phone. However, this only changes how your phone sees the device. It doesn't change the name saved on the board itself. But it's something
hello buddy, thanks for the great video... but i have a question...what quality bluetooth adaptor would you recomend me to connect to a classic music system sony grx70 ?, is it worth it to connect a BT adaptor that supports LDAC o aptX HD that i can buy on aliexpress(there so many that i cannot decide)?, I want to transmit a better quality sound from my smartphone thru TIDAL, and also making config to my phone... is it possible to notice a better hifi quality sound if I do what I have planned?.. thank you , cheers!
hi there. Im planning to do the same thing to my old speakers, do you mind telling me what solution you came up with.
I'm thinking of buying a cheap bluetooth receiver to connect to auxiliary but i'm not sure whether the sound quality is affected or not.
Thank you for your time!
What are the cables you used to connect the speaker to the board?
Just regular speaker wire. 18 or 17 awg
Thanks you sir
Thanks.
Exatamente o que pesquiso , uma boa placa com bluetooth e micro SD se puder me orientar agradeço ..
You can see if this one works for you. I have it: s.click.aliexpress.com/e/_Dl26d4h
The Bluetooth device is connected successfulle 😂
Can you recommend one board that you have tested that provides good sounds quality output.
I have the last board he reviewed and think it’s amazing (no beeps) especially for the money. 😊
Hi dude, can i ask where learned about electronics? and can you recommend somewhere for me to start to learn from the beginning?
Hey Anthony, if you want to learn for fun, take a look at a few TH-cam channels like Electroboom, AfroTechMods, Great Scott!, the EEVBlog.
All of beepeng noises come from your power adapter, lol.... You must use smps adapter with stabilized and filtered voltage output... Beeping my ass....
Have you tried wuzhi audio?
I would stay away on those devices with JLxxx or Beken based Bluetooth module. They all include those Chinese lady voices thing.
"dah bluetoh devwise is connecteded uh successfulleh" at full volume.
Not all of them its what the designer wants for firmware mine has the doo doo do, di di di. Or the windows sounds
i know how to rezolv the problem from the last Bluetooth board
Can you also review tpa3816 based board?
You sure that's the correct chip name?
@@LeftyMaker oh yeah, i've made a mistake its the tpa3112d2 chip by texas instruments as i remember
what speaker are you using with the yellow cone?
It is a Monacor SPH-30X. It is really good for its size but I think it has been discontinued for a while. A new version comes in black.
you not use speaker that suitable to the amp wattage, and i doubt you have maximum voltage and ampere to supply it
What makes you think this way?
Is this the guy from phonearena!?
Yes. How did you know it's me?
@@LeftyMaker The voice! I remember watching your reviews as a teen when I was deciding on which phones to buy :). Sorry in case ppl mention it a lot, this is the first time I've stumbled upon your channel, very interesting!
That's cool! You're actually the first one to say they recognized me. I still work at PA, just doing very different stuff now, and TH-cam is just for fun. Hope you like the videos and thanks for watching! :)
I brought h38 this is goods
Very good 👍👍👍
Thank for information...Greetings from Indonesia 🔔
Hey bro where you buy that circuit
Hi, there are links in the video description.
I didn't hear the bass.
Myślę że masz zepsuty głośnik o 8 ohm ma być 4ohm a najlepiej 2ohm moduły grają w klasie d i dziwek jest czysty i klarowny naprawdę można się zdziwić.
This is what i exactly looking for. Thank you so much for this video. I use 7492p 50w amp board in this video. Now i am looking for XH-A354 20w amp board which have yamaha amplifier chip. Could you please test and give your opinion
Audionic max 350 ic number kaya
let´s see if I understand.. with this borads no amplifier is needed¿¿
Could you please connect it to the proper speaker, not to such squiki cat :P
So none are usable?
Only the two I linked to in the description are kind of okay. Not perfect, but good enough. But I can only recommend using them with 8 ohms because they don't have a heatsink and get warm.
@@LeftyMaker I have received some of these just yesterday:
www.aliexpress.com/item/32985655660.html
$1.50 a pop.
Very decent audio quality, no weird language, only a 1-second long tone when powered on and when paired.
Can recommend.
EDIT: also tested the one with integrated stereo 5W amplifier. Issues to report:
1. there is nothing in low end frequency. Kinda understandable why they did it, as there are no caps on 5V rail to support the current peaks.
2. pops and clicks between audio tracks, or between words and sentences on a podcast. Looks like it enters some kind of sleep mode when there's a silence for half a second, and the switching is poorly implemented, likely on AC coupling between receiver and amplifier chips.
The headphone one seems pretty decent though.
Tda7492 best
Like so many things from China its just cheap crap best to make your own
on ne teste pas des amplificateur sur des hp nus, c'est un peu n'importe quoi...
class AB better than class D
I believe that to remove that annoying voice you will have to change the bluetooth chip
Or change firmware but those JL ac6905 variant chips dont have good documentation