REVIEW - Stereo Bluetooth Amp DW-CT14+

[@MulderXfile]

I just got my board and really love it. I'm going to order 10 more of them

[@Helectronics]

Yes, these boards are very good!

[@Helectronics]

I would recommend you to buy it today, there is Anniversary sale on Aliexpress and this product is cheaper for the next 20 hours.

[@BlackyZE]

Hello, I have one of this board and sound volume is weak. Speakers are 4ohms. I heard there are variations of such board. Ones with good power and one with weak power. Did you have such experience ?

[@Helectronics]

Hi, I had no such experience, I own three of this board and all works great. You might have a faulty product.

[@officialhonorupdates]

This board when connected to mobile shows battery percentage?

[@Helectronics]

Hi, no, it doesn't show the battery percentage.

[@FM_PERON2022]

What about high frecuency noise at the outputs? I'm planning on having one of these for my dual tpa3118 bluetooth speaker, since the bluetooth module i have it's not stereo and outputs a REALLY annoying high frecuency noise (+ amplification of it)

[@Helectronics]

Hi, be careful, this module is POWER amplifier, this means only speakers can be connected. I recommend the XY-BT-MINI stereo receiver with really good quality low level output.

[@FM_PERON2022]

@@Helectronics yeah, I saw those XY-BT's, thx for the reply

[@Helectronics]

Thanks for watching!

[@Amin1one]

hi . thanx to your video. When I turn off the music, a noise is heard for up to 1 second. This noise is present when playing. How can I turn off the noise?

[@Helectronics]

Hi, thanks for watching. These small class D amplifiers usually have this hissing noise, when music is stopped, then after a few seconds it turns off the output, so it stops. This can't be solved on this board,you must buy a better board.

[@Amin1one]

@@Helectronics Thank you very much for answering me I do not have electronic information. Can I use a capacitor to reduce noise and increase quality? Does the capacitor only affect the sound quality and does not eliminate the noise?

[@cristian-scd]

Hi, My module has a startup with some messages with a kind of bad English by a Chinese lady. Also at startup the volume is very high. Is it possible to change this messages with some bips as I saw in some reviews?

[@Helectronics]

Hi, unfortunately not. Those what you've seen in my videos were ordered also from Aliexpress from the WorldChips store and when I'm lucky I get with the bip sounds and not with the Chinese woman announcer. I could find a page where the receiver ic, JieLi AC6905 (which this board also has) is explained well, but it is not a complete guide, just a beginning on how to program these ICs. Thanks for watching!

[@cristian-scd]

@@Helectronics Thanks for quick answer. It is unfortunate. The ladies english is really bad, otherwise the module works fine.

[@richardciglansky4723]

Hi i have the same board connected to 4ohm 3W speakers. I get a faint but audible hum. Is it normal ?

[@Helectronics]

Hi, yes it has a hum in idle, but when I start to play music the noise stops or gets attenuated. What kind of power supply do you use? Using a LiIon battery with protection circuit can help.

[@richardciglansky4723]

@@Helectronics thanks for answer. Yes i am using 18650 battery with protection. I have also tried running it without the protection and that didn't help with the noise. Do you have any idea how can i remove that noise ?

[@Helectronics]

You can try to put between the output of the board and the speaker an LC lowpass filter (coil and capacitor). If that does not help, probably you have a faulty module. You can watch my other video: Connecting PAM8403 to XY-BT-MINI where I do a lot of troubleshootings.

[@richardciglansky4723]

@@Helectronics Thank you very much. I will try that and watch that video :D

[@webten7381]

Good review!! I have both of these boards and was wondering why the black one(m38) clips if I raise the volume above 50-60 percent? Does this happen with your board too?

[@Helectronics]

Thanks! I don't have the M38 board so I can't really help with that. I haven't noticed clipping at this board, it is working just fine. What kind of power supply do you use for it?

[@webten7381]

@@HelectronicsI am using regular smartphone 5v 1amp supply. It seems to me that there is some kind of distortion in low frequency when I cross 70% of the volume in dw-ct14. You should give a try to MH-M38 board, it comes in black colour. M38 board goes maximum up to 50-60 percent of the volume but still it beats dw-ct14 in terms of volume and clean sound.

[@Helectronics]

Try to use a better charger (for ex.: 5V 2A) or try to use it with Li-Ion battery (with protection circuit)

[@Helectronics]

I will buy an M38, but the shipping is long, so hopefully in 2-3 months I will have one

[@rylandc2915]

Hi what is the highest speaker wattage one can use with regards to 4ohms. And will I have to use a protection for battery?

[@Helectronics]

The speaker wattage must be higher or equal to 5 watts. I do recommend using battery protection module too. Thanks for watching!

[@rylandc2915]

Can two 70watt RMS speakers be used to make a Bluetooth speaker system using this amplifier?

[@Helectronics]

Yes, those speakers are good. Here is a video which can help you with the wiring: kzbin.info/www/bejne/rIOqg5iqa6-erNU

[@atakanyldz1926]

Hello i have the same module but power and connection indicator sound is a voice of a chinese woman speaking and its really annoying is there a way to turn it off ?

[@Helectronics]

Unfortunately there is no way to turn it off.

[@nizamudeenmohammed8898]

If I connected 18650 3.7V Battery for power how to make charge whether we need to add TPA4056 Charging protection board ?

[@Helectronics]

To charge the battery, you just have to connect a micro USB charger to the TP4056A module and it should charge automatically.

[@Helectronics]

The red LED indicates that it is charging, when it's done, only the blue LED stays on.

[@nizamudeenmohammed8898]

@@Helectronics Thanks Bro for Your Response

[@Helectronics]

You are welcome, just ask if you need more help. Watch my other videos, I use the TP4056A module in my other projects too.

[@mitrekx]

What is the minimum bluetooth version required for this device to work?

[@Helectronics]

Sorry, but I don't know that, I'm sure it works with the most phones

[@RavsAjay]

Can I pair 3W - 4ohms x 2 speakers, without any issues. and hey, thanks for the review very helpful.

[@Helectronics]

Yes, it should work with those speakers, but I recommend bigger ones, at least 10W rated for greater sounds quality. Thanks for watching!

[@nizamudeenmohammed8898]

@@Helectronics How many watts is compatible bro?

[@Helectronics]

@@nizamudeenmohammed8898 The board output has 2x3 watts but as I mentioned I recommend more powerful speakers.

[@jayrdeleon625]

hi Helectronics can i connect the Lout- and Rout- to make a L GND R output for my power amplifier? Thank

[@Helectronics]

Hi, I won't recommend to do that, the output is a PWM signal, which can harm your power amplifier. This circuit is designed to be connected directly to speakers. If you want to use your power amplifier buy the XY-BT-MINI bluetooth receiver product, which you can see here: kzbin.info/www/bejne/joe5ZIKBm7-Bj6c

[@officialhonorupdates]

Is 8ohms 6w speaker good it with or 2ohms 6w speakers?

[@Helectronics]

If you have at least four 8 ohm speakers then it is better, you just connect two in parallel per channel, which results 4 ohm impedance per channel.

[@officialhonorupdates]

@@Helectronics if I connect 8 ohms per channel then?

[@Helectronics]

It will work just fine, in the video I've tested this module wih 8 ohm speakers

[@waqaasss]

Do this board also charge battery or we need separate charging board?

[@Helectronics]

Tomorrow I will measure it if the output voltage at Bat connector does not exceed 4.2 volts. Theoretically yes, you can connect it but I would recommend using a dedicated charging board. I made a separate video about this in Wonkey Monkey bluetooth speaker repair video, you can find it on my channel.

[@nizamudeenmohammed8898]

If I connected 18650 battery there is no any charging indication How can we fix?

[@Helectronics]

This board has no built in indicator, it has a safety shut down feature against over discharge of the battery. As I said in the video I do recommend to use protection circuit with the Li-Ion battery. You can connect charge indicator module separately to it, or you can find charge protection and management circuit with charging indication.

[@nizamudeenmohammed8898]

@@Helectronics In that case I need to Use TP4056 Charger Module for protection

[@Helectronics]

Search on my channel BUILD - WonkyMonkey Bluetooth Speaker Repair, in that video I've used this module with the same protection circuit as you mentioned.

[@nizamudeenmohammed8898]

@@Helectronics Awesome 👍 Surely I will watch

[@felipehcraftgamer4193]

can you connect the two outputs in parallel?

[@hellrider15]

I haven't tried it yet, but I think it won't work.

[@jerichopilapil6673]

Hello sir ! compare to Mh-m38 and ct14+ what is better ? thanks

[@Helectronics]

Sorry, but I do not own MH-M38 board so I can't compare them yet. Thanks for watching!

[@jerichopilapil6673]

@@Helectronics thanks for the response sir :D

[@ryadimuamar6097]

I have this one at home.. But i got problem. If i play with full volume the sound is not good.. What can i do to fix it... My speaker is 2x5watt 4ohm 2inch.

[@Helectronics]

Have you tried to connect better/bigger speakers? Probably it is reaching the full excursion. Furthermore, what kind of power supply do you use?

[@Tsardoz]

The capacitor polarity is not relevant for an AC signal. You do not need the LC filter either. The high frequencies are filtered out by the speaker itself. Almost all class D amps operate this way.

[@Helectronics]

Yes, when used, the LC filter is not needed, but to make the measurements it is needed.

[@ghitsacellguppy928]

Hiii.. its work or not if i using to calling celluler ?? For example blueatooth headset call in out, same or not? Please reply

[@Helectronics]

This does NOT have call function, also it has no microphone. This is good only for listening music.

[@RA-mi8hk]

This board have charging module or not

[@Helectronics]

It has but it is not really safe, I recommend using a separate charge managment module.

[@curpassamuelalin6751]

The important fact is that when you listen to a voice recorded, the noise supression is kicking in and the amplifier is turning off and on, loosing sometimes some words from the recording when the amplifier is turning on again, thanks to that stupid function - noise cancelation.

[@curpassamuelalin6751]

But, when you listen to music, it is ok.

[@Helectronics]

Yes, the beauty of the chinese products

[@officialhonorupdates]

Does sound crack or distort on full volume

[@Helectronics]

Just a little bit, but it also depends on the speaker.

[@officialhonorupdates]

@@Helectronics if I connect 4 speaker in parallel (3w 4 ohms) it will work? Or voice will distort

[@Helectronics]

4 speaker in parallel? Per channel? That's not a good idea. You should connect two-two in series per channel. So, on one channel/output two 4 ohm speakers in series will result an 8 ohm load, which is good for the board.

[@officialhonorupdates]

@@Helectronics but as per board specification it said 2ohms to 8 ohms moreover if I connect in series means more resistant and less sound

[@officialhonorupdates]

@@Helectronics two speaker on one channel and another two On other channels so net is 6w 2 ohms per channel

[@jouvarider3571]

Compared with cheap bluetooth speaker amplifier , which is better sir ?

[@Helectronics]

You mean like already made bluetooth speaker, like the JBL or Sony? This board is cheap, also it has not a reliable Li-Ion recharge management so compared to commercial bluetooth speakers it is worse, also in sound quality.

[@jouvarider3571]

I mean such as fake jbl or another one.... I planned to buy 2" , 4 ohm 5 watt neodymium speaker for DIY bluetooth speaker

[@Helectronics]

I don't know which is better, probably the already made bluetooth speaker. Do you have instrument to measure the speaker parameters to build a corresponding enclosure?

[@Helectronics]

Haven't had a fake or cheap bluetooth speaker.

[@jouvarider3571]

Ok thanks sir ,

[@Benja-re9cb]

Is it possible to connect it with two 3w 2ohm speakers?

[@Helectronics]

I found a description where it is written, I quote: "Can connect two 2-8ohm, 3-10W speakers, push storage with 3ohm 5W and 4ohm 10W speakers." So it might be compatible with 2 ohm speakers, but I haven't tried it.

[@curpassamuelalin6751]

Yes, but with the power supply of 4,2v maximum

[@bado0or321]

Can I use 3 Watts , 8 Ohms x2 Speakers ?

[@Helectronics]

Yes, but it won't be as loud as with 4 ohm speakers.

[@llucaso9404]

Can it Charge a li-ion battery? (Does it have CC/CV )

[@Helectronics]

You can, but I would recommend using a dedicated charging circuit with protection. Here in this video you can see how I've done it: kzbin.info/www/bejne/rIOqg5iqa6-erNU

[@nikk91002]

Sir, CT14+ vs PAM 8403 which is best for sound quality

[@Helectronics]

Haven't compared them yet, but I'm working on a review video for PAM8403, soon it will be uploaded.

[@WASPgaming2890]

Can we buy in amazon Please give the link Or any other way

[@Helectronics]

I gave Aliexpress link because I've bought it there and I know it is a reliable shop. I'm sure this module is also avaible on Amazon but I'm not sure if it reliable or not.

[@ichhassdievoll]

very nice review

[@Helectronics]

Thanks for watching!

[@WaynePryce]

Whats a protection circuit?

[@Helectronics]

The protection circuit or Battery Management System (BMS) is used for charging the li-ion battery. It is essential for li-ion batteries, therwise it can blow up.

[@WaynePryce]

@@Helectronics do I need a BMS to connect the amp to a lipo? If yes what type of lipo do you suggest? I'm building a sound system for my rc truck

[@Helectronics]

For Lipo battery I don't know exactly, but for Li-ion I've used the TC4056 as seen in this video: kzbin.info/www/bejne/rIOqg5iqa6-erNU

[@WaynePryce]

@@Helectronics I'm looking to run 4 speakers and have enough power so the amplifier doesn't chip out

[@Helectronics]

What is the impedance of the speakers?

[@pedroramirez2215]

Did not put frequency in which it works, I mean how low does it go

[@Helectronics]

Tomorrow I will hook up the oscilloscope to the board and let you know how low can it go.

[@pedroramirez2215]

@@Helectronics wow thanks very much apreciated

[@Helectronics]

I've measured today, it can go around 100 Hz and after that slowly drops, so this circuit is not the best for low frequencies.

[@pedroramirez2215]

@@Helectronics Thanks you very much that settles, I'll try to find a better one 20 is my goal but I'll take 40 if it's cheap :p

[@Helectronics]

Check out the Sanwu stereo bluetooth amp, recently I made a review video of it, that can go way lower!

[@valveman12]

Helectronics I have a few of these boards and they are very good for the price. I made the mistake of connecting 12V to one of them and well "SMOKE" my bad.

[@hellrider15]

Yes these are very good boards, it can be used in almost every speaker to make it bluetooth speaker for a good price.

[@felipehcraftgamer4193]

I test my and the maxiumum safe voltage for it about 6volts

[@jesrelsunit60]

Hi, I have just watched your vids, they are helpful thank you. I wanna ask, Is the JZ B5W2 amplifier good? It looks like the one from this vid.

[@Helectronics]

Unfortunately I don't have that but I've searched for it and it looks the same, I think you can try one but don't expect 2x5W clean output.

[@jesrelsunit60]

@@Helectronics Thank you.

[@jesrelsunit60]

@@Helectronics Hi again, I am using a 2400 mAh li ion battrey on my DIY, and i am planning to use a Booster on it, Is it ok?

[@Helectronics]

You don't need voltage booster, it should work fine with the 3.7 volts, but if you still want to use booster, you will have to sacrifice around 10% of battery charge on efficiency losses, also try not to exceed the 5 volts too much.

[@jesrelsunit60]

@@Helectronics Hi again, I have found a old li-ion 2800mAh samsung battery. It is not 18650 its flat and it still works, Can i use it for this board? if yes should i remove and use a different protection board? Thank you So much for the Information!!

[@sameshitdifferentcolour4197]

hissing noise is noticable or not?

[@Helectronics]

I didn't notice hiss, but probably on a hifi speaker it can be heard. At 2:52 the board is working and it is connected to the phone but no music is played, still you can see some spikes, so there is a noise present, but probably my speaker (which is more like a subwoofer) didn't output this noise.

[@DJDevon3]

​@Den crafter No you need a separate charger module. I use it with an Adafruit 259 Li-ion Charger and it works perfectly with a single cell 2500 mAh battery. Great for DIY BT headphone projects.

[@9892Shaikh]

Can Add volume control dual channel

[@Helectronics]

I assume you think to add a potentiometer to the output, but it would not work, the potentiometer would burn out. You have to control the volume from the phone or to use XY_BT bluetooth receiver module with PAM4803 dual amplifier circuit and use the potentiometer between them. I think there is a way to add volume buttons to this circuit, but I'm not sure about that. I've searched for a datasheed for the receiver IC and there is a way to add buttons to the IC, but this need to be tested. Here is the datasheet: www.chenbingdom.com/uploadfile/201721417245311011.pdf

[@jefflichauco8437]

how about the watts??

[@Helectronics]

As I said in the video, the measured output is 1.5 watts for a channel, I speak about this at 5:00, thank you for watching.

[@bluecrafter_]

I can't turn it to max volume because it has to much distortion

[@Helectronics]

What kind of power supply do you use? Does the speaker support at least 5 watts?

[@bluecrafter_]

@@Helectronics 10w 8ohm I have tested on three or four speakers. I wanted to built a Bluetooth speaker but this Amp has not enough power. I have bought a 6w Amp I hope this own does the job should arrive today

[@Helectronics]

@@bluecrafter_ Do you have 4 ohm speakers? 8 ohm speaker are not so good with this amplifier, those are too silent. Also it may happen that you have a factory faulty module.

[@bluecrafter_]

@@Helectronics I have found a 4 ohm speaker has much more power at 4ohm I think I will build two speaker

[@Helectronics]

@@bluecrafter_ You should try it with two 4 ohm speaker, it will be loud enough.

[@VietThanhA]

Anh ơi tại sao em mua về nó kết nối được nhưng không hát được

[@Helectronics]

Hi, sorry to hear yours is not working, what kind of power supply and speakers did you use?

[@jesrelsunit60]

I bought it, the jz b5w2 and it sounds distorted

[@Helectronics]

What kind of power supply did you use and what kind of speakers?

[@jesrelsunit60]

@@Helectronics I used a single 18650 2600mah vape battery. And as for the speakers I used aiyima 1.5 inch 4Ohm 5w neodymium speaker... One that looks like the jbl go2 speaker driver.

[@Helectronics]

Is the battery charged fully, using a BMS charger? Also you should try to connect bigger speakers that can handle more power, these 5w speakers should handle it theoretically but give a try with bigger speakers.

[@jesrelsunit60]

@@Helectronics yeah it's charged full with a 7.5a 1s bms. I will try using bigger speakers.thanks.

[@Helectronics]

Let me know what are the results.

[@hernandez2641]

hi bro when u connect to headphones.. is it sound good?bass? thx bro.. i want to make bluetooth helmet with this.. :)

[@Xyeraa857]

Nice subtitle Indonesian

[@Helectronics]

Probably the KZbin auto-translated the english subtitles, thanks for watching!

[@alkotib85]

Спасибо.

[@Helectronics]

Thank you for watching!

[@BlackyZE]

This board is shit, at list regarding power. It is very low loudness at 4 Ohm load. No more than 500mW.

[@Helectronics]

You must have a faulty module then, did you use a good power supply? Have you measured the output with oscilloscope?

[@euvo_sound]

I dunno why,but 1 piece of this is overpriced.

[@Helectronics]

Probably, you can try to search for the same board from other manufacturers with different price.

[@jesrelsunit60]

Hi again, um I need help with my diy, I used a 7.4v 2600mah on a 20w amplifier with 10w*2 driver and when I put it on 80% volume up, it makes this crackling noise, pls help .. idk what to do..

[@Helectronics]

Hi, sorry for late response, what kind of amplifier is that? Does it have a brand or number? Have you tried using 8ohm speakers?

[@jesrelsunit60]

@@Helectronics hello, It's ok. The amplifiers name is xy-p15w.

[@floritobentillo1864]

Does it get muffled at max volume?

[@Helectronics]

Sorry but I don't remember, this video was made a few years ago. I do remember that the lower frequency range is poor and the bass is not so good.