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Has anyone dealt with a dead mic ?
One day out of the blue on 4.4 mic stoped working.
Installed L 5.1. beta 3 and the mic still seems dead (Calls and Google voice) HOWEVER in sound recorder the mic works (picking every single sound) ...
Further more installed the HiQ Mp3 recorder which apparently can use front and or back mic and it works in all configs .(front back and stereo)
Tried different values via engeenering mode with no luck ....
****** Apologies to all this post was misplaced in this forum *********
I guess I should replace the charging board alltogether however I am puzled that the recordings come out clean ......
Anyone with a similar experience ??
(btw sound on wired headset is fine ... bluetooth sound is broken I think due to beta since the bt headset and speaker I tried didnt work)
Phone is Jiauy S3A
Ok Results
The issue was a dead mic (low mic) or rather a near dead mic.
Replacing the mic (on the same board ) resolves the issue (note that you can use third party mics i used asamsung one)
Best test to realise where is the fault
Open the camera recorder and start recording
Close the top mic hole with your finger, start talking in the lower mic and in the end gently (very gently) blow towards the hole.
Repeat on the top hole with the lower hole closed
After that listen to the video
If there is a problem with a mic the voice might be heard but the blow will be almost inaudiable in the problematic mic.
I have exactly the same problem - mic works fine on sound recorder and on the video camera, but Google Voice Search and using the phone does not (I've tried your blow test and it's all fine). This surely cannot be a hardware fault, can it ?
I've tried updating to LL5.1 beta3, but same problem. I've fiddled with the audio settings in the engineering menu, using a variety of values, and turned off the noise reduction without any success.
Any ideas ?
clayts450 said:
I have exactly the same problem - mic works fine on sound recorder and on the video camera, but Google Voice Search and using the phone does not (I've tried your blow test and it's all fine). This surely cannot be a hardware fault, can it ?
I've tried updating to LL5.1 beta3, but same problem. I've fiddled with the audio settings in the engineering menu, using a variety of values, and turned off the noise reduction without any success.
Any ideas ?
Click to expand...
Click to collapse
Google voice was the main indicator that the mic was bad ....
Do the blow test again and try as "gentle" as possible and then compare the results, if the uper mic is louder then then mic is dead or nearly dead.
Most probable that you ll need to change your mic
Thanks for your help - can you provide a link to the replacement mic you used (or did you use one from an old phone) - and is it easy to replace ?
Unfortunately I did go to a service shop for the repair, so I dont have a model number, all I know is that he proposed two different types, one was a noname and the other one was made by samsung (so my guess is that any samsung service center can sell you one) .
The process took about half an hour, unsoldering the old mic and soldering the new and the cost was 10 euros ( around 11 USD)
Sorry I couldnt be any more helpfull on that.
I found that, after video recording with stock camera app, main mic stop working for calls. only upper mic working. you can test it with 2 phones in both hands. but I was find simple solution: many people holding phone when taking pictures so the controls are on right side. but if you turn you phone so the shutter button will be on left side, after video recording, main mic still working!!! btw. if you like to take a shoot with control button on right side, just after you finished, turn your phone for 180° and make one more shoot, just to save your main mic for calls. no reboot needed after this action. tested on many roms, KK or LP, happend with all roms and stock camera. so problem is with stock camera app and sensor that give the information to phone to disable main mic.
Well mine was definitely a hardware fault - got a replacement lower board (USB/mic/speakers) and replaced it myself - all good again.
I think i've got the answer. The lower mic is broken for some of us. When we got to the camera app and take a video and turn the phone around it will indeed change the mic and then will use the upper one (still working) in future calls. This is why you can then be heard after when you call someone, but you'll be using the upper mic and the lower mic is still broken. Once your reboot you have to redo this. I'd like to buy a new board (usb + mic) but we cannot find any on internet anymore. Except some sellers on Ebay who are selling it from 150 dollars to 900 dollars (no joke). I guess i don't have much solution except doing that trick and use the upper mic and then try not to reboot the phone.
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
Hi there,
Since this is my first post i want to say hello to everyone!
I decided 3 weeks ago to buy an android head unit for my audi a3, since i was bored listening radio or audio cd;s only...
Audi OEM RNS-E navigation was an option but it's too expensive just to have navigation, bt, and mp3 in my car... so i decided to go for an android hu that fits my dash...
I found this Xtrons android HU and bought it....
I was aware about the poor sound quality BUT it's actually VER VERY bad!!! on standard 10 speakers Audi sound system... (i was ready to root the device and use viper4android, or any hardware mod to improve the sound)
BUT I was lucky to find a BOSE sound system which i retrofitted on my car, and now the sound it's much better... like 8/10
NOW the last problem that i'm facing is some background noise, which i can't explain where it came from.
It only happen when i plug in the xtrons head unit. I swapped to the original Audi HU and there is no background noise. This means the background noise is picked up / generated by the Xtrons HU.
The noise is like a continuous "buzz" plus 2-3 pops and it only appears when the unit is on pause, mute or very low volume AND ONLY WHEN I SWITCH THE IGNITION ON (NO ENGINE RUNNING), if i revers the ignition to 0 position the noise disappears.
If the engine is running the noise is there, but is very hard to hear due to the diesel engine...
This noise IS NOT a wining noise, like an alternator generated...
Anyone encounter this problem? Is there any fix?
Tomorrow i am going to replace all the Xtrons HU extension cables (audio/video in/out) with shielded cables, and if doesn't work, i'll try some ferrite(s) maybe it helps...
Thanks!
justincr83 said:
Hi there,
Since this is my first post i want to say hello to everyone!
I decided 3 weeks ago to buy an android head unit for my audi a3, since i was bored listening radio or audio cd;s only...
Audi OEM RNS-E navigation was an option but it's too expensive just to have navigation, bt, and mp3 in my car... so i decided to go for an android hu that fits my dash...
I found this Xtrons android HU and bought it....
I was aware about the poor sound quality BUT it's actually VER VERY bad!!! on standard 10 speakers Audi sound system... (i was ready to root the device and use viper4android, or any hardware mod to improve the sound)
BUT I was lucky to find a BOSE sound system which i retrofitted on my car, and now the sound it's much better... like 8/10
NOW the last problem that i'm facing is some background noise, which i can't explain where it came from.
It only happen when i plug in the xtrons head unit. I swapped to the original Audi HU and there is no background noise. This means the background noise is picked up / generated by the Xtrons HU.
The noise is like a continuous "buzz" plus 2-3 pops and it only appears when the unit is on pause, mute or very low volume AND ONLY WHEN I SWITCH THE IGNITION ON (NO ENGINE RUNNING), if i revers the ignition to 0 position the noise disappears.
If the engine is running the noise is there, but is very hard to hear due to the diesel engine...
This noise IS NOT a wining noise, like an alternator generated...
Anyone encounter this problem? Is there any fix?
Tomorrow i am going to replace all the Xtrons HU extension cables (audio/video in/out) with shielded cables, and if doesn't work, i'll try some ferrite(s) maybe it helps...
Thanks!
Click to expand...
Click to collapse
I have that problem with my Erisin, too. Curious whether your new cables will solve the noise problem. Please post it here, if it worked out :good:
justincr83 said:
Hi there,
Since this is my first post i want to say hello to everyone!
I decided 3 weeks ago to buy an android head unit for my audi a3, since i was bored listening radio or audio cd;s only...
Audi OEM RNS-E navigation was an option but it's too expensive just to have navigation, bt, and mp3 in my car... so i decided to go for an android hu that fits my dash...
I found this Xtrons android HU and bought it....
I was aware about the poor sound quality BUT it's actually VER VERY bad!!! on standard 10 speakers Audi sound system... (i was ready to root the device and use viper4android, or any hardware mod to improve the sound)
BUT I was lucky to find a BOSE sound system which i retrofitted on my car, and now the sound it's much better... like 8/10
NOW the last problem that i'm facing is some background noise, which i can't explain where it came from.
It only happen when i plug in the xtrons head unit. I swapped to the original Audi HU and there is no background noise. This means the background noise is picked up / generated by the Xtrons HU.
The noise is like a continuous "buzz" plus 2-3 pops and it only appears when the unit is on pause, mute or very low volume AND ONLY WHEN I SWITCH THE IGNITION ON (NO ENGINE RUNNING), if i revers the ignition to 0 position the noise disappears.
If the engine is running the noise is there, but is very hard to hear due to the diesel engine...
This noise IS NOT a wining noise, like an alternator generated...
Anyone encounter this problem? Is there any fix?
Tomorrow i am going to replace all the Xtrons HU extension cables (audio/video in/out) with shielded cables, and if doesn't work, i'll try some ferrite(s) maybe it helps...
Thanks!
Click to expand...
Click to collapse
Hey you. Did the new cables solve the problem? I'm asking because I want to get rid of the annoying sound, too.
Sc4r3Crow said:
Hey you. Did the new cables solve the problem? I'm asking because I want to get rid of the annoying sound, too.
Click to expand...
Click to collapse
Unfortunately, no, i didn't fix the annoying buzz
justincr83 said:
Unfortunately, no, i didn't fix the annoying buzz
Click to expand...
Click to collapse
It's a pity ?
Did you also try a noise suppressor or something like that?
Sc4r3Crow said:
It's a pity ?
Did you also try a noise suppressor or something like that?
Click to expand...
Click to collapse
Hey,
Has anyone found solution to this annoying noise ? I have installed XTRONS unit in my audi a3 and can't get rid of it. Have tried already ground loop isolators and ferrite filters with no luck.
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?
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