Database Users

What is the best mic fix for this tablet?

I'm new to this tablet, only had it a week and relized people cant hear me when i Skype with them. So before i purchase a head phone set with a mic on it i wanted to ask here to find out what is the best solution ??

I use a stereo headphone (make Wesc - more or less 50 €) with a little microphone which is located on the cable (close to the headphone). The sound is crystal clear.
I didn't find any other solution for using voip (skype, google) with this tablet.

I use it in three ways.
1- like castafiore do.
2- using only a headphone, no mic. (use the internal mic)
3- using speakers conect to heatphone plug. (use the internal mic)
I think that the "plug" disconect something internal in reference with the "cancel noise system."
Please excuse my bad english.

tabasco22 said:
I use it in three ways.
1- like castafiore do.
2- using only a headphone, no mic. (use the internal mic)
3- using speakers conect to heatphone plug. (use the internal mic)
I think that the "plug" disconect something internal in reference with the "cancel noise system."
Please excuse my bad english.
Click to expand...
Click to collapse
So are you saying that all I need is head phones no mic?

Yes.
If you want better results, you can install: "volume control"
market.android.com/details?id=com.revsodev.volumecontrol&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5yZXZzb2Rldi52b2x1bWVjb250cm9sIl0.
and high the "in-call volume".
Try skype test.
I talk with my son every night and he hear me wery well.

Unlike tabasco22 even though the noise is reduced when there is something plugged into the headphone jack, the internal mic is not usable for skype.
it seems that there are many headphone/mic sets that work, though i have tried 2 iphone sets that do not .

bullyspud said:
Unlike tabasco22 even though the noise is reduced when there is something plugged into the headphone jack, the internal mic is not usable for skype.
it seems that there are many headphone/mic sets that work, though i have tried 2 iphone sets that do not .[
So should i not buy headphones with a mic that are for apple ipod or iphone?
Click to expand...
Click to collapse

I use SONY headphones ,speakers.

using a $1.50 headset with mic i got from ebay. works great. actually it works way better then it should for that price.

yo all have been thanked

I was gonna just drill a bigger hole in mine lol I guess I could be more logical ill try volume control + see if it helps any
Sent from my HTC Inspire 4G using Tapatalk

Making a hole?
There is another solution: take off the back cover of the tablet. If you do a test with the two microphones totally uncovered (as I've done myself), you will notice that there is NO improvement at all.
Evidently, the problem doesn't come from there...

castafiore said:
Making a hole?
There is another solution: take off the back cover of the tablet. If you do a test with the two microphones totally uncovered (as I've done myself), you will notice that there is NO improvement at all.
Evidently, the problem doesn't come from there...
Click to expand...
Click to collapse
Yea figured thanks for the info:thumbup:
Sent from my HTC Inspire 4G using Tapatalk

Anybody tried remove second mic? I mean sound canceling mic. Or maybe just cover it with tape.

I think it's a software problem, between the level of the microphone and cancel noise system level
This problem disappears when you insert any kind of plug into the speaker output., which cancels the "noise canceling system".
deepdelete, you phisicaly disconect the "sound cancelling mic" when you insert a plug.

I think sensitivity of sound canceling mic must be lower, or it must be placed somewhere else.
Sure there is also possibility to correct things with software mod.
http://en.wikipedia.org/wiki/Noise-canceling_microphone

deepdelete said:
Anybody tried remove second mic? I mean sound canceling mic. Or maybe just cover it with tape.
Click to expand...
Click to collapse
Yes, I did try that as well. But it doesn't make any difference neither.
I think you could be right, deepdelete. The second microphone on the a500 faces the back of the tablet (opposit the user).
But the 2 microphones are so closed to each other that the desired effect (as explained on the link you give), the "noise-cancelling", doesn't work properly. It's just a guess but it sounds logical (to me, anyway ).

Surprised nobody mentioned, removing the tab from the cover if you use one.
Found this out the hard way. Tab's cover, actually covered the mic! And, if I held it in my hands, it actually picked up the residual sound my fingers made when holding it. Resulted in a "garbled" sound on the other end.
I found with skype, the best thing, was to remove it from the cover, and place it on the covers "stand".

Where is the microphone located? I can't even use the voice search function with mine.

STUPID MIC locations... AGAIN AGAIN AGAIN AGAIN AGAIN AGAIN
There are two mics..
ONE is dead center in the grove between the glass and case at the top of screen. you will see a tiny slot..
the second one.. on the right of the sd card door you will see a tiny hole.. Its right under there.. This one is for background noise canceling. Like from the a500s own speaker.. and does not work well.. The mic works ok with yahoo messenger.. if YOU HAVE NO BACKGROUND NOISE AROUND or you cover that back mic..on not well BUT BETTER THEN IT DOES WITH GTALK OR skype ..
it just sucks is all there is to it.. I tried replacing the mic with a high end known to work well mic . NO LUCK So its either a hardware chip.. or software issue.. Do not think this will ever be fixed .. USE HEADPHONES

Android head unit microphone issues

These systems are well known for their mic troubles and I have taken this up with the manufacturer. There is a post that I have seen somewhere in this forum that details a hardware fix. From what I have gathered, anyone brave enough to attempt and has accomplished this fix has not reported any issues; great for the electricians out there.
I do work in the computer industry, but identifying electrical components and soldering is not something I am too confident with. The manufacturer did however, send me an updated update.img file in response to my mic issues. I've installed this and it made some improvement, but nothing so significant that I have actually started using the mic. It also has a new wallpaper and noticed that the default apps have been updated, but not sure how?
Anyway, I've just had a bright idea! I've tried improving the mic by using various bluetooth mics, various external mics that plugin into the mic jack, using the internal mic and manufacturer software update. All make very little difference, but has anyone actually tried using a USB mic?
I don't have one to hand and don't really want to buy one if this doesn't solve the issue. Would drivers/android recognising the usb device be an issue? Hoping someone has had a go at trying this out or can try it out if thay have a usb mic?

Shame no one replied on this one. Did you end up trying a USB mic solution and did it work out for you?

Yeah... Haven't tried it yet as don't want to buy one if it doesn't work. Your reply to this thread would have bumped it back to the top so may still get a response Im hoping

According to this link http://liliputing.com/2012/09/using-skype-on-an-mk802-android-4-0-mini-pc.html, a microsoft lifecam vx-700 with built-in microphone was found to be working on some android devices. The question is whether our firmware would work too. And whether there would be a way to simply disable the built-in input and only route the external usb sound in. It all feels like its probably too much to ask....

OK so I tried a cheap usb webcam with built in microphone to see if it would make a difference. The webcam seems to be working fine for video, was instantly recognized by android and showed video, but sound is still the horrible mess coming from the internal mic. I doubt that a dedicated USB mic would be any different.

Thanks for checking... you saved me some time at least.

Could it be when using an internal mic + external at the same time that can cause this kind of trouble? That is what it seems when i read around forums.

have a look at this, maybe it helps:
http://www.autopumpkin.com/forum/viewtopic.php?f=3&t=171&start=90

I simply cut the internal red wire to mic and installed external mic again and the problems have disappeared. I have been told there is a slight echo but that may be fixed by changing the BT firmware from default.

I think the mic location on the HU is excellent and we don't really need to route an external mic somewhere else. How about just trying to desoldier the old one and try to locate a high quality one and soldier a new one ?
Fortunately I am lucky and my internal mic works great.

raptor18 said:
I think the mic location on the HU is excellent and we don't really need to route an external mic somewhere else. How about just trying to desoldier the old one and try to locate a high quality one and soldier a new one ?
Fortunately I am lucky and my internal mic works great.
Click to expand...
Click to collapse
Lucky you, though to be fair without an external mic my internal worked, just not very well. I have read somewhere that soldering to the internal connections had issues but not sure why, it cant hurt to try can it?

roscored1000 said:
Lucky you, though to be fair without an external mic my internal worked, just not very well. I have read somewhere that soldering to the internal connections had issues but not sure why, it cant hurt to try can it?
Click to expand...
Click to collapse
Shouldn't be a tough solder job.
Just make sure to use a solder sucker to remove old mic and you should be fine.

Guys,
I have the same problem with my android car navigation system.
I have a Note 4 and an android car navigation system in my car (with built in wifi and Bluetooth (BT)). The microphone of the car navigation system has a very low quality, it is almost not working/usable. I would like to pair my phone to the car system in BT but would like to disable the built- in microphone of the android car system and use the note 4's microphone by default and hear the sound of the person who is talking to me on the car speakers.
Is this possible? How? Do I need to use third party apps ?
Many thanks in advance

So frustrating... Anyone have a fix yet?
Android head unit mic barely picking up.
Why have they not fixed this issue?
So frustrating. Got everything all hooked up and straightened out except the daggum mic. I just bought this android head unit (9.0) and the person on the other end of the phone call can't hear me. So I plugged in the external and same. They can barely here me when I am screaming into it.
I have got to get this fixed.
Anyone found a solution yet???

Find out how to get into the engineering menu of your HU, there you can adjust the mic gain. Also have a look at this thread for other ideas.

did you fix it?
---------- Post added at 12:07 PM ---------- Previous post was at 12:03 PM ----------
I improved the level of my mic built-in with th MTK enginerring app. hardware test and changing mic volumen in normal mode, headset mode and loudspeaker mode, but it is not enough when engine is working. I will try to solder and external mic to the pads of mic built-in. I think that it is problem of software filtering because when engine is off, sounds doesn't rattle, the volumen is not to high but the comunication is steady, but when i start the engine, conversation gets cuts. maybe engine sound is interfering with the mic built-in mic. I will update progresions.

8227L YT9216BJ Head Unit
even my above car android unit has mic problem. it does not recognize the voice commands unless spoken very close to the mic, which is not practical
Also, Bluetooth calls are intermittently heard (with Airtel). But when switched to JIO simcard, works fine.
Please can anyone support with a solution on both the issues
[email protected]

In short for helping anyone that has the same problem
I have a Bosion D6 android (android 10 version – 4 gb ram 64 storage, 8-core) head unit on my Ford Focus mk2.
Everything was perfect expect the microphone, even after I installed the external mic that came with it, the sound was poor and my listeners’ complaint that the quality of the conversation was not very good.
Read tons of stuff here and elsewhere so I decided to spend some money (around 20€) and bought a Sony microphone XA-MC10 to replace the Chinese original (since I have read some good reviews and you can find it in your local market also)
The difference was more than noticeable and everyone now listen to me perfect. i test it myslef through the sound recorder app and it seems like going from say 64kbits/s to 146kbits/s or more.

I don't want to open another thread because the problem is similar.
When I connect with iphone carplay, the interlocutor often hears me jerky, I tried both internal microphone and external also cutting the internal one to exclude it but nothing.
Using the application "microphone amplifier" and applying the filters instead it feels perfectly, but obviously every time it should start and set, so very boring.
Tried to use MTK Engineering mode to change the mic volume, but it doesn't solve completely.
Anyone have any ideas to try?
Thank you in advance

Did anyone ever find a solution to sounding really quiet to the person your calling? Cheers

joying phone bluetooth only on one speaker

Called joying and they told me the audio for the phone bluetooth connection only will come out of the front left speaker on all their units, can anyone confirm this? In my vw the sound while on a phone call comes out of all the speakers. Any car i have ever been in the sound comes out all speakers while on a call, not sure why on these it only comes out one channel if its true.
Thanks to anyone to confirm this.

On mine it comes out the passenger side. I know my Kenwood would allow me to select. I've gotten used to it so it's really no big deal
Sent from my SM-N910P using Tapatalk

madcowintucson said:
Called joying and they told me the audio for the phone bluetooth connection only will come out of the front left speaker on all their units, can anyone confirm this? In my vw the sound while on a phone call comes out of all the speakers. Any car i have ever been in the sound comes out all speakers while on a call, not sure why on these it only comes out one channel if its true.
Thanks to anyone to confirm this.
Click to expand...
Click to collapse
Yup mine does the same thing and it really sounds bad. It comes out of the passenger side and middle dash speaker, but mostly just the tweeters....At highway speed I cant hear half the call.....I am hoping to find a way around this.

Oh wow OK. I had an idea u had a spare Bluetooth speaker laying around and I can use that in the car but it basically defeats controlling the audio from the dash. This blows my mind how bad the audio is in these. Now is that speaker out or rca out on yours?

madcowintucson said:
Oh wow OK. I had an idea u had a spare Bluetooth speaker laying around and I can use that in the car but it basically defeats controlling the audio from the dash. This blows my mind how bad the audio is in these. Now is that speaker out or rca out on yours?
Click to expand...
Click to collapse
No, my current set up is still using the factory wiring harness. I havent had a chance to get my amps and trunk all set up for the RCA outs yet. I am hoping someone smarter than me can figure out a way to change the phone audio output settings.....

I am pretty sure it could be done with alsa mixer but I have no clue how to use it to route audio in Android it's very complicated and zero instructions.

madcowintucson said:
I am pretty sure it could be done with alsa mixer but I have no clue how to use it to route audio in Android it's very complicated and zero instructions.
Click to expand...
Click to collapse
It really is a shame. The phone app is just sad all the way around on this unit. Not having a Favorites list is a another big downer.....and I dont know if yours does it at all, but when I am on a phone call I cannot access anything until the call is ended. Everything gets grayed out even when I minimize the call option on the bottom of the screen....I am pretty sure that is just a bug in the software that will get fixed in an update

I don't have a unit yet myself but at this rate it may be only good for controlling the phone but for that matter I can get a separate controller for that.

On my Joying it does this as well, all of the audio comes out of the front passenger speaker. However it doesn't sound bad. It gets very loud, and I can make and receive phone calls fine. The sound is mono as opposed to stereo, and that does sound weird, but I have no issue hearing calls.
Can people with a non-Joying unit chime in? does it do the same one speaker thing? or is that Joying specific?

In the old days this was common practice so as the speakers didn't cause feedback with the microphone which was most commonly mounted atop the drivers pillar. So the opposite speaker was used for audio

I have a Funrover head unit since almost a week and I have the same issue, sound is coming only from front speakers which make the call over bluetooth just a hell for me.
I barely can hear the caller specially while driving
this is a nightmare !!!

Sofia units use both front speakers.
All PX5, no matter Joying or other units, only use one front speaker

surfer63 said:
Sofia units use both front speakers.
All PX5, no matter Joying or other units, only use one front speaker
Click to expand...
Click to collapse
Ok thanks, but that being said, is there a way to remediate to this ?

namek09 said:
Ok thanks, but that being said, is there a way to remediate to this ?
Click to expand...
Click to collapse
I don't know. It is already going back to the PX3 models. Loads of topics written about it in the mtcb/d forums. It is best to search there.
phone audio is mono anyway, so I guess they just route it to one of the boxes.

Bluetooth calls SUCK!

I got fed up with not being able to understand a word when my wife is driving, with her old Android 4.4.4 head unit. 4 years ago I tried all of the known microphone mods, externalizing the internal microphone and splitting the microphone between the Bluetooth and the internal microphone. It never really helped.
During Aliexpress big sale recently, I got her a px6 (non-MTCD) head unit. The screen and everything else seems to work fine, but the noise when she is talking via Bluetooth is just unbearable. I have tried a few different external microphones, and it sounds like a tornado is blowing in the background. I refuse to start cutting mics again and am just going to return it.
Are there any units out there that have decent sound cancellation? Or is that too much to ask of a chinese radio?

Mekede Headunit Microphone Quality

Folks, I'm at my wits end and hope someone here can help. I purchased a Mekede M300 Android head unit (I believe this is a rebranded Joying unit) over a month ago for my wife's Honda HR-V 2017. Installation was fairly straightforward and any minor issues that came up were able to be resolved messaging the seller on Aliexpress.
There is one major issue that remains which is a dealbreaker - call quality is absolutely horrendous while driving and/or with the air conditioner on.
I've tried:
Testing on multiple devices
Testing with and without an external 3.5mm microphone installed (unit has a crappy internal one)
Factory resetting
Adjusting "sound mix scale" and "power conditioning" values in unit settings with no noticeable improvement
What I believe is happening is some processing/filtering is being done on the mixed audio input from internal mic (and the external mic, if plugged in). AC or road noise drowns out my voice and I cannot be heard well on the other end. No idea how to avoid this...
Does anyone have any suggestions or solutions? Attaching system info if it helps identify the device.

This is a major issue with all of these Chinese head units. They do not use noise-cancelling microphones.
As soon as "ambient noise" like airco, ventilation, tyre noise, wind noise, engine noise, etc. becomes too loud, you can forget it.
Even a 10 euros/dollars investment in a cheap noise cancelling internal mic (so two cheap mics instead of one cheap mic) would already be a great difference.
Even the cheap units are so powerfull that simply using two very cheap mics and some algorithm to separate the "general constant" noise from the "differentiating" signal (voice) would make a huge difference.
Maybe you could try with a USB headset to see if you can use a USB microphone for a phone call. If it works you might purchase a USB-cancelling microphone. I must admit I never tried that as I don't do phone calls in my car.

surfer63 said:
This is a major issue with all of these Chinese head units. They do not use noise-cancelling microphones.
As soon as "ambient noise" like airco, ventilation, tyre noise, wind noise, engine noise, etc. becomes too loud, you can forget it.
Even a 10 euros/dollars investment in a cheap noise cancelling internal mic (so two cheap mics instead of one cheap mic) would already be a great difference.
Even the cheap units are so powerfull that simply using two very cheap mics and some algorithm to separate the "general constant" noise from the "differentiating" signal (voice) would make a huge difference.
Maybe you could try with a USB headset to see if you can use a USB microphone for a phone call. If it works you might purchase a USB-cancelling microphone. I must admit I never tried that as I don't do phone calls in my car.
Click to expand...
Click to collapse
Thanks for the info. Any recommendations for a replacement mic? I already tried purchasing a rather cheap one on Amazon that didn't make a noticeable difference.

I tested hypercardioid microphone and results were pretty good, but it has to be mounted near your head. Problem I have is that internal microphone, the one on the display, is still on. I'm thinking of de-soldering it as it's not too difficult to access.

firstbob said:
I tested hypercardioid microphone and results were pretty good, but it has to be mounted near your head. Problem I have is that internal microphone, the one on the display, is still on. I'm thinking of de-soldering it as it's not too difficult to access.
Click to expand...
Click to collapse
I read about this and didn't want to have to do it if possible. Was call quality acceptable with the hypercardioid microphone? Can you provide a link?

fusionice said:
I read about this and didn't want to have to do it if possible. Was call quality acceptable with the hypercardioid microphone? Can you provide a link?
Click to expand...
Click to collapse
It's like this one: https://www.aliexpress.com/item/1005002433011687.html I specifically was looking for cardioid microphone that does not pickup lower frequencies, this one starts at 50Hz.
It could be a bit louder ( gain was set to medium ) so it's probably not perfect, but results from directional pickup were good.

firstbob said:
It's like this one: https://www.aliexpress.com/item/1005002433011687.html I specifically was looking for cardioid microphone that does not pickup lower frequencies, this one starts at 50Hz.
It could be a bit louder ( gain was set to medium ) so it's probably not perfect, but results from directional pickup were good.
Click to expand...
Click to collapse
Thanks, I'll look into that one.
When you say that you set the gain to medium, is that some setting on the headunit? If it is, I could not find a similar setting on my unit.
@surfer63 I've seen one of your posts breaking down different values in the "config.txt" file. Could mine be a culprit? It is set to "persist.btmic.gain=8"

fusionice said:
Thanks, I'll look into that one.
When you say that you set the gain to medium, is that some setting on the headunit? If it is, I could not find a similar setting on my unit.
@surfer63 I've seen one of your posts breaking down different values in the "config.txt" file. Could mine be a culprit? It is set to "persist.btmic.gain=8"
Click to expand...
Click to collapse
Browsing through engineering menus I saw the mic gain settings. I found it after testing so I did not play with it.

fusionice said:
@surfer63 I've seen one of your posts breaking down different values in the "config.txt" file. Could mine be a culprit? It is set to "persist.btmic.gain=8"
Click to expand...
Click to collapse
This one is unknown to me. Like mentioned: I don't do phonecalls in the car and never even looked at this one. I really don't know.

On my head unit, a TEyes FYT sc9853i unit, it did not have an external mic connector. I modified the harness so that my stock car microphone could be used. I soldered a connector directly to the internal mic location and removed the internal mic. It was located on the side panel where the touch controls are located. It is easily accessible from behind through a separate removable cover panel. Not sure if yours is the same. The stock microphone is located just above the drivers sun visor. I have a North American Kia Sorento 2012 SX.

mastrv said:
On my head unit, a TEyes FYT sc9853i unit, it did not have an external mic connector. I modified the harness so that my stock car microphone could be used. I soldered a connector directly to the internal mic location and removed the internal mic. It was located on the side panel where the touch controls are located. It is easily accessible from behind through a separate removable cover panel. Not sure if yours is the same. The stock microphone is located just above the drivers sun visor. I have a North American Kia Sorento 2012 SX.
Click to expand...
Click to collapse
I think it's likely that all 9" (and probably 10.1") HU displays with capacitive buttons on a side are the same. I have TS10, relatively new unit, and date on the that side board is 2019.

mastrv said:
On my head unit, a TEyes FYT sc9853i unit, it did not have an external mic connector. I modified the harness so that my stock car microphone could be used. I soldered a connector directly to the internal mic location and removed the internal mic. It was located on the side panel where the touch controls are located. It is easily accessible from behind through a separate removable cover panel. Not sure if yours is the same. The stock microphone is located just above the drivers sun visor. I have a North American Kia Sorento 2012 SX.
Click to expand...
Click to collapse
Yes mine looks like this as well. How difficult was your modification? Did you need to build a custom harness/connector to keep the OEM mic? Seems pretty involved, but I'd give it a try if I just needed to solder a readily available part.

If you have access to 4pda, the hardware forum has good write-ups on microphone changes and other hardware modifications. I use Google Translate for 4pda and it works well enough. This has info for an external mic:
Головные устройства TEYES - Аппаратная модификация, автозвук, брак и ремонт - 4PDA
Головные устройства TEYES - Аппаратная модификация, автозвук, брак и ремонт, [Головное устройство][Автомагнитола][Android]
4pda.to
I needed an external module for my head unit to work with the OEM amplifier. The module harness came with a connector for the OEM mic. It plugged directly into the microphone connector I added to the head unit.
It's a little involved, but not difficult. My soldering skills are very limited. Made a huge difference in the call quality.

For those of you who run across this thread (as I did) trying to resolve the mic / bluetooth call quality issue, I thought this might help.
I desoldered the built-in mic and tried various high quality aftermarket microphones, none of which solved the issue. Then, as a last-ditch, 'why not?' effort, i plugged in the cheap mic that shipped with the head unit. Surprisingly, this works well! So, for all of you having the call quality problem, disable your internal mic and use the mic that came in the box with your Mekede/Navifly unit; it just might solve the problem.
I don't know what's really going on, but I have a theory that higher quality, more sensitive mics actually reduce call quality on these units as they try to filter out all the extra background noise and overcompensate... but the included external mic is less sensitive and is what they test with, so that's what they tune the unit for.
Anyway, I hope this helps somebody.

Trayal said:
For those of you who run across this thread (as I did) trying to resolve the mic / bluetooth call quality issue, I thought this might help.
I desoldered the built-in mic and tried various high quality aftermarket microphones, none of which solved the issue. Then, as a last-ditch, 'why not?' effort, i plugged in the cheap mic that shipped with the head unit. Surprisingly, this works well! So, for all of you having the call quality problem, disable your internal mic and use the mic that came in the box with your Mekede/Navifly unit; it just might solve the problem.
I don't know what's really going on, but I have a theory that higher quality, more sensitive mics actually reduce call quality on these units as they try to filter out all the extra background noise and overcompensate... but the included external mic is less sensitive and is what they test with, so that's what they tune the unit for.
Anyway, I hope this helps somebody.
Click to expand...
Click to collapse
I guess you did not check the impedance of the microphones you've tried did you? A microphone can only work well if it's impedance (ac resistance) matches the input impedance of the microphone preamp. That's also the reason why the internal and external microphone never perform well in parallel installation. That's something that the Chinese manufacturer don't understand it seems...

Another head unit but I'm sure not too different to illustrate disconnecting the internal mic:
https://forum.xda-developers.com/t/...-usage-reference-thread.4236281/post-87970225

blue_one said:
I guess you did not check the impedance of the microphones you've tried did you? A microphone can only work well if it's impedance (ac resistance) matches the input impedance of the microphone preamp. That's also the reason why the internal and external microphone never perform well in parallel installation. That's something that the Chinese manufacturer don't understand it seems...
Click to expand...
Click to collapse
Apologies for missing this until now. I unfortunately did not measure the various mics' impedance. I will note, though, that while the one I noted (that shipped with the head unit) did work better than anything else I tried at that time, due to a rather harsh sound at freeway speed, the Mrs. wanted me to keep searching. I tried one more aftermarket mic that ended up working even better. Here it is on amazon:
FingerLakes 3.5mm Microphone
The stats on the page list the following:
Sensitivity: -30dB+/-2dB
Frequency Range: 50Hz-20KHz
Output Impedance: ≤2.2 kΩ
SNR: >58dB
I don't know how accurate the above specs are, but it's a really inexpensive mic so if anybody has the proper equipment and wants to measure impedance and post it here for posterity, this is an inexpensive unit that is working well on my Mekede UIS7862 unit.

Did you ever get this resolved? I have the exact same issue. Is there an adapter that I could purchase to connect my OEM microphone?

Kmaso1 said:
Did you ever get this resolved? I have the exact same issue. Is there an adapter that I could purchase to connect my OEM microphone?
Click to expand...
Click to collapse
That depends...
You need to check how your car exposes the mic connection. If it's part of the main EOM connector you have to add additional wires and solder a 3.5 mono plug on them.
If your car provides the mic via a separate plug there may be adapters available.

I have a separate plug for external mic. Here is a photo of the rear of the unit. The mic is poor with and without the external one plugged in