Database Develop

[Q] Razr I Audio Issues (3.5mm Jack)?

I've been having a problem with my Razr I which was purchased around the 11th October from Handtec, and I'm just trying to work out whether this was a faulty handset or whether it's common for the device, or affects a certain batch.
The issue is high levels of hiss / interference when a speaker is connected to 3.5mm jack while audio is not playing. Hard to describe the sound as it changes, however it's somewhere between hiss, ground loop and EM interference.
There's also an unpleasant thump when audio output turns on (i.e. just prior to playing audio) or off (a few moments after the audio output is stopped).
The hiss/interference noise reduces significantly immediately before and after playing audio i.e. it seems to go down to an acceptable level once the audio chip is taken out of 'sleep' mode and made active. I can only assume that this is because a noise cancellation circuit is removing the interference once the audio chip is activated, but that while it's inactive the unwanted signal is making its way down the cable connected to the 3.5mm jack.
This happens regardless of whether the device is connected to wall socket - and I've tested with a battery powered speaker - so this isn't a ground loop issue as far as I know. It is most noticeable when connected to an external speaker that's turned up to a decent volume, but is also audible through headphones. Please note that different headphones will show the issue to a different extent, as the impedance of headphones can vary quite widely. Through small earphones, the sound isn't too offensive, but through an external speaker or decent headphones it's completely unacceptable.
I tried temporarily disabling the MusicFX app and doing a factory reset – no luck with either unfortunately.
There is a report on gsmarena from someone who noticed the hiss. They got a replacement and there was no hiss on the replacement handset.
The thing that's confusing me is that this seems like two separate issues - though I may well be wrong.
1) poor EM shielding and/or cancellation circuitry inactive when audio is not playing and
2) no soft-start / soft-stop when capacitor(s) on the audio chip is charged/discharged and/or DC offset on the signal coming from the audio chip.
The phone's in the box ready to be posted back to Handtec, but just wanted to try and understand whether anyone else has experienced this issue? Just to note that although I haven't been through the returns process just yet, support from both Motorola and especially Handtec so far has been great.

http://forum.xda-developers.com/showthread.php?t=1930361
---------- Post added at 12:28 PM ---------- Previous post was at 12:23 PM ----------
tomrazri said:
There is a report on gsmarena from someone who noticed the hiss. They got a replacement and there was no hiss on the replacement handset.
Click to expand...
Click to collapse
that was me. the replacement was much better. still not upto gnex audio via headphones standard but the positives elsewhere on the phone (vs the gnex) mean i can live with the slight drop in audio quality.

Ah ok that's promising cheers. As you've mentioned in that thread, it's only really a problem when music's not playing and when the audio chip is activated/deactivated. No realm qualms with the quality of the audio chip itself as i wouldn't expect a studio grade dac in a phone, just the interference / lack of soft-start that was the dealbreaker. Fingers crossed my replacement will be from a different batch

my first unit came from clove. my replacement from amazon uk. good luck
Sent from my XT890
---------- Post added at 04:43 PM ---------- Previous post was at 04:28 PM ----------
build date on my replacement unit is sep 22 if that helps

tomrazri said:
I've been having a problem with my Razr I...
...The issue is high levels of hiss / interference when a speaker is connected to 3.5mm jack while audio is not playing. Hard to describe the sound as it changes, however it's somewhere between hiss, ground loop and EM interference.
Click to expand...
Click to collapse
I'm having exactly the same problem with my XT890 - bought from Amazon round 10th Oct., device build date is 22 Sept.
tomrazri said:
...seems to go down to an acceptable level once the audio chip is taken out of 'sleep' mode and made active. I can only assume that this is because a noise cancellation circuit is removing the interference once the audio chip is activated, but that while it's inactive the unwanted signal is making its way down the cable connected to the 3.5mm jack.
Click to expand...
Click to collapse
In my case the hiss is present only in sleep mode with no music on. I can hear silent thud roughly 3 secs after pressing power button to enter the sleep mode followed by the annoying hiss (only on left ear though). It's not loud at all, in fact it's barely noticeable during the day. It only drives you insane if even subconsciously.
---
tomrazri said:
This happens regardless of whether the device is connected to wall socket - and I've tested with a battery powered speaker - so this isn't a ground loop issue as far as I know. It is most noticeable when connected to an external speaker that's turned up to a decent volume, but is also audible through headphones. Please note that different headphones will show the issue to a different extent, as the impedance of headphones can vary quite widely. Through small earphones, the sound isn't too offensive, but through an external speaker or decent headphones it's completely unacceptable.
Click to expand...
Click to collapse
I think this is where the problem lies. First I thought its down to frequency response or even impedance. I think its due to different 3.5mm jack layout. I have no problem what so ever on my Klipsch S4A (10-19khz, 18ohm, 4 rings jack) but on my Koss PRO 4AAT (10-25khz, 250ohm, regular 3ring jack) its simply unbearable.
Shall I try to send it back to Amazon in hope the new piece will be flawless?

denny76 said:
In my case the hiss is present only in sleep mode with no music on. I can hear silent thud roughly 3 secs after pressing power button to enter the sleep mode followed by the annoying hiss (only on left ear though). It's not loud at all, in fact it's barely noticeable during the day. It only drives you insane if even subconsciously.
Click to expand...
Click to collapse
i 'think' i had the same hiss you are talking about on my first device. it was certainly noticeable as i mentioned before and unnacceptable i have no hiss on my replacement unit.
3 secs after any music has come to a stop, it sounds as if the internal amp (?) 'clicks' off. that 'click' is/was present on both devices i had but as that does not interfere with and music playing, i don't see that as a problem.
who knows if we are all talking about the same 'hiss' or not

Hiss on Razr I
I had exactly the same problem on first device but on replacement that hiss gone but not all together but 10x better . I have got 64gb micro sd card full of music and I love chillout stuff where any extra noises spoils listening pleasure . Btw my device was prom phones 4 u

Replacement received. Hiss/EM interference and the pop still there :crying:

ooo that is bad luck. as you got both from handtec, i can only assume they had a faulty batch that moto fixed on newer builds.

denny76 said:
First I thought its down to frequency response or even impedance. I think its due to different 3.5mm jack layout. I have no problem what so ever on my Klipsch S4A (10-19khz, 18ohm, 4 rings jack) but on my Koss PRO 4AAT (10-25khz, 250ohm, regular 3ring jack) its simply unbearable.
Click to expand...
Click to collapse
Well, you first thought it could be the impedance but you forgot it or what? It's quite common problem that not all the amplifiers like all headphones. Can happen with hifi equipments too, but mostly mobile devices just don't have good enough output for high impedance headphones. Low impedance headphones are a bit more battery friendly.
I think people just looks silly walking around with big-ass-headphones. About the same as using tablets as cameras.
Anyway, my phone does have slight hissing noise with 18 ohm headphones, but I can live with it.

Sure I think this is probably not an issue for a lot of people, as I want to be able to output to speakers rather than just listen on earphones.
Agree big headphones look silly, I'd only wear them on long train journey's not strolling around
If it doesn't affect the way you use the phone that's fine, and for those people I don't think it should influence their buying decision. The gsmarena review calls out aux audio quality as an issue though and measures it in comparison to other phones, and it doesn't fare so well. It'd be interesting to know whether the situation's improved in later revisions.
If the interference and pop happened with other devices I'd understand it, but I've had no issues with various other mp3 players, smartphones and tablets feeding the same headphones and speaker systems.
Oh well, hopefully be able to buy in a month or so when I'm reassured they've fixed it.

tomrazri said:
If the interference and pop happened with other devices I'd understand it, but I've had no issues with various other mp3 players, smartphones and tablets feeding the same headphones and speaker systems.
Click to expand...
Click to collapse
i'm confused by what you say above 'not having issues with other smartphones'. i thought this was your first smartphone purchase according to your review on amazon...
http://www.amazon.co.uk/review/R15W...e=UTF8&ASIN=B008QBBDQ0&linkCode=&nodeID=&tag=
Perfect form factor and excellent battery life. Despite being a bit of a geek, this was the first smartphone I've bought, because it ticks all the boxes that no other smartphones have so far.
Click to expand...
Click to collapse

Yep, phones of friends don't have the same issue. It hasn't been a problem with some models of HTC, iPhone and Samsung that I've tried with the same speaker systems. I imagine there are plenty of older Motorola handsets that don't have the same issue too so it's nothing against them.

Posted this question on Motorola customer care, but recived a useless anwser. I don't know phone internals, but my guess is problem lies in incorects volume regullation. Just like with with connection of PC with amplifier, if you would turn your amplifier to maximum volume and try to regulate volume only with PC volume controll, you would get similar noise.
Here is my post to Motorola: h**ps://docs.google.com/document/d/1R5ngSJzSjmjbsHPTqnEaUDa3h7oR4OC8l13hK-512uI/edit
and attached noise record: h**ps://docs.google.com/open?id=0B4n8pwAEMymPdHpXUmJHeEV3eVk

Car Chargers / Headphones

Hey Guys,
Mentioned this on a couple of other threads, but I feel it needs a dedicated one.
Firstly, the output from the headphone jack to the line in on my car is poor, the level is so low i'm cranking it up to 20 just to get a decent listenable volume level, my previous phones (Atrix, Nokia N900) didn't require this.
Secondly, if I use my car charger with the phone and try and use the line in, there is massive interference that is louder than the output its self making it impossible to listen to music. Again another issue not present on my previous phones using the same charger.
I am going to attempt to make a recording of the noise, and I'll upload this later.
Can a few other people test this out and see if you get the same result please?
Cheers
Andy

Just get a ground loop filter for $5 and you are golden.
Sent from my Nexus 4 using xda app-developers app

I have noticed low headphone output also. I use a ground loop filter so I haven't noticed too much white noise but having to turn up the volume louder than normal to make up for the low output makes it worse. I only hear it in-between songs.

Hmm I'll try and find a ground loop isolator and see if that makes any improvement.
Just don't understand why it is such an issue on the Nexus 4.
The noise for me is louder than the audio that is being output rendering it useless. Going to upgrade my car with bluetooth at some point so that will solve all the problems.

High pitched noise

Hello,
My Optimus 4X HD outputs a strange high pitched Noise from the headphone output. It basically sounds exactly like coil whine from a graphics card would sound like. I tried plugging it into 3 different amplifiers to check if its really my phone or the amp i was using but turns out its my phone (I also tried my brothers ipod on the same amp with the same cable and the noise was gone). I am running the latest nightly of CM11 and have no apps or tweaks installed which would alter anything sound-related. This is really annoying especially when there is no music playing, can anybody help me?

dualtorch said:
Hello,
My Optimus 4X HD outputs a strange high pitched Noise from the headphone output. It basically sounds exactly like coil whine from a graphics card would sound like. I tried plugging it into 3 different amplifiers to check if its really my phone or the amp i was using but turns out its my phone (I also tried my brothers ipod on the same amp with the same cable and the noise was gone). I am running the latest nightly of CM11 and have no apps or tweaks installed which would alter anything sound-related. This is really annoying especially when there is no music playing, can anybody help me?
Click to expand...
Click to collapse
Three ways:
It's a ROM-related issue. This means every CM11's user - at least on our X3 - should experience that: in my case, I'm not experiencing it, yet. You could make a test, by switching to another ROM, checking if the annoyance is still there.
It's a phone-related issue. This means your phone has a manufacturing defect or something got broken.
Your headsets are broken, instead. You could try them on another platform.

I have exactly the same issue, no matter which ROM do I use, gotta live with that

mulencja said:
I have exactly the same issue, no matter which ROM do I use, gotta live with that
Click to expand...
Click to collapse
Turns out the cause of this is the crappy audio chip of the LG, it produces interference noises when the impedance of the amp/device you are plugging it into is higher than 100 ohms.. thats also why it doesnt appear when using headphones as those usually have a lower impedance (mine have 32 ohms for example)...

JamPort USB DAC car audio?

http://www.isimplesolutions.com/charge/jamport-streaming-charging.html
Anybody here ever play with one of these?
It says it works with the GS4, it seems to be just a USB DAC. From what I remember, our N4's work on this type of device, right?
From the user manual:
IS3301 uses Android Open Accessory Protocol. Accessory mode is ultimatley
dependant on the devices hardware, and not all devices support accessory mode
Click to expand...
Click to collapse
This is pretty much exactly the device I've been looking for. I've got a really good head unit, it's just that it's pre-BT/USB/anything else useful. It'd cost me pretty big bucks to replace with a equivalent "modern" HU. I currently use a 3.5mm->RCA->HU aux input setup right now that is lacking in quality.
I just can't find anything about this thing online.

I'm not sure about that particular device, but most if not all USB DACs work with the N4 (on 4.x at least, LP reportedly broke compatibility with some previously working units ). I have an Asus Xonar U3 ($40 when I bought it from Amazon), and it's really FAR surpassed my expectations. As long as you plug it in before launching your (any, afaik) music player, it should produce a very noticeable improvement on sq. If you do end up getting a USB DAC, I'd highly recommend at least checking out the 14 day trial of USB Audio Player Pro... it bypasses the system's drivers and uses it's own, and IMO the sq is untouchable! If you listen to a lot of music from your N4 (a great output source in itself, x100 with UAPP) I can say pretty confidently that investing in a DAC will greatly increase your enjoyment! :good:

i use my nexus 7 as my in dash, how would this help ? currently just using 3.5mm port to rca to get the audio out...

does it charge the tablet at the same time?

I should have mentioned in my post above that portable USB DACs are primarily intended to be used with headphones. They will generally improve sound output to speakers as well, but a car-audio specific device like the one the OP posted may be better for that application... however, the only immediately apparent difference are the RCA plugs vs. aux. Worth the price difference? Not having heard that device as well as the lack of info/reviews (possibly a bad sign), my guess would be "no". With a device like mine or the Fiio usb models, you get the bonus of versatility: carrying it in your pocket and using headphones and then just using it in your car via an aux input (as long as your receiver has one). A caveat to using a portable USB DAC is that they actually drain your battery significantly faster (I found it odd that mine would only work with a "regular" micro usb to usb adapter cable, no sound when I tried it with a powered micro usb hub).
There may very well be better products if the intent is just to use it for car audio... I'm just not personally aware of any. I'm sure there are better forums (similar to head-fi.org but specific to cars) where you could probably find or get better answers re: good DACs for car audio

masri1987 said:
does it charge the tablet at the same time?
Click to expand...
Click to collapse
The one I posted says it does charge @2A.
My other question is: What controls the audio volume when you use a DAC?
My biggest issue is even with the volume maxed on my N4, my h/u sees very low input volume, and I have to nearly max out my h/u's volume to get anywhere, which induces a lot of clipping and distortion.. Which is bad.
jazzmachine said:
I'm not sure about that particular device, but most if not all USB DACs work with the N4 (on 4.x at least, LP reportedly broke compatibility with some previously working units ). I have an Asus Xonar U3 ($40 when I bought it from Amazon), and it's really FAR surpassed my expectations. As long as you plug it in before launching your (any, afaik) music player, it should produce a very noticeable improvement on sq. If you do end up getting a USB DAC, I'd highly recommend at least checking out the 14 day trial of USB Audio Player Pro... it bypasses the system's drivers and uses it's own, and IMO the sq is untouchable! If you listen to a lot of music from your N4 (a great output source in itself, x100 with UAPP) I can say pretty confidently that investing in a DAC will greatly increase your enjoyment! :good:
Click to expand...
Click to collapse
I hear you on the lack of reviews/info on it being a bad sign, but I'm guessing the vast majority of people have no idea wtf a DAC even is..

ummduh said:
The one I posted says it does charge @2A.
My other question is: What controls the audio volume when you use a DAC?
My biggest issue is even with the volume maxed on my N4, my h/u sees very low input volume, and I have to nearly max out my h/u's volume to get anywhere, which induces a lot of clipping and distortion.. Which is bad.
I hear you on the lack of reviews/info on it being a bad sign, but I'm guessing the vast majority of people have no idea wtf a DAC even is..
Click to expand...
Click to collapse
i use a line-driver before i route the audio to my amp to make it sound like a pioneer deck , but that's wit a 3.5 mm to rca plug... imagine with this product.. i'm concerned about overheating because it's constantly charging and i live in phoenix and it's hot as you know what
and viper4android of course

It looks like the charge wiring is separate, you could always switch it on/off as required.
I'm thinking about giving this a go and see what happens. It's still a TON cheaper than replacing my h/u.

ummduh said:
The one I posted says it does charge @2A.
My other question is: What controls the audio volume when you use a DAC?
My biggest issue is even with the volume maxed on my N4, my h/u sees very low input volume, and I have to nearly max out my h/u's volume to get anywhere, which induces a lot of clipping and distortion.. Which is bad.
Click to expand...
Click to collapse
Re: volume control, it depends. Some have some kind of volume control on the DAC, but most don't. With most music players you just control the volume as usual from the phone. Usually the output is louder than it would be otherwise, but particularly clarity at high volume. Considering your description, I think you'd notice even more of a benefit from using UAPP - the volume is controlled by a slider on the "now playing" screen (there's a setting to use the physical volume buttons also, but warns that it will drain much more battery) and it can definitely play music louder overall.

gonna try this as well..
Does a USB OTG kernel capable is required for this?
---------- Post added at 06:34 PM ---------- Previous post was at 06:33 PM ----------
http://www.amazon.com/iSimple-Charg...e=UTF8&qid=1427909651&sr=8-1&keywords=JamPort
is this the same product? damn cheaper too.

According to the specs on that page, yes, it's the same product; "IS3301".
And thanks for finding it! I'll pick it up and give it a try and post back, eventually.

Well, got it and installed it.
A few things:
1) Was wrong on being able to switch power. If you don't hook up the power wires, the DAC doesn't power up.
2)Won't work on the Note4 with a stock /rooted Tmobile ROM. Just can't do it. Why? No idea. The USB Audio Pro app doesn't work either.
3)DOES WORK and sounds great with both a Nexus 7 (2012) 4.4.4 and an ASUS ME173X., 4.2.2.
4)Even working on those 2 tablets, it pops up a dialog box saying something to the effect of "No apps that are compatible with this device are installed". Still works anyways, every app I tried played properly through it.
5)Audio is basically ON/OFF. If you adjust the audio volume on the tablet it's all or nothing, no in between.
I'd still like to figure out how to get it working on the Note, tethering the tab to my phone is less than elegant, the ME173x tablet is pitifully slow and horribly unresponsive, and it seems Samsung in their infinite wisdom have also removed BT tethering.

Also not working with Note 4 and the canadian 5.0.1 ROM (chenxiaolong). Argh. Going to try some different cabling, possibly a data only cable, I've read some Samsung phones do weird stuff with USBOTG and charging.

Static Noise with joying 5.1.1 double din vw radio

Hi,
I recently bought a Joying Radio for a VW, it is a 8" touch screen and so far seems to work, I only have a really annoying problem with the noise. When I am not playing any music, the speakers emit a static noise, the volume of the noise never changes even if I turn up the radio. Since I am not always listening to music, I would still like to fix the problem. I read and the Sticky thread something about ground loop noise, but could never find an explanation to it. Maybe someone of you can help me
Also my weather app doesn't seem to work, if someone has any ideas
Thanks in advance, if you need any other information for solving this problem, let me know

How loud is it?
A very low static sound is common on these units. I have it both of mine. As you noted, thankfully the volume of the static does not increase with the volume so I really don't notice it when music is playing.

kaitzo said:
I only have a really annoying problem with the noise. When I am not playing any music, the speakers emit a static noise
Click to expand...
Click to collapse
You can try:
- linking the metal case of the unit to ground wire;
- shielding harness wires, as better you can

popeye70 said:
You can try:
- linking the metal case of the unit to ground wire;
- shielding harness wires, as better you can
Click to expand...
Click to collapse
The noise is not that loud, you only hear it if you are not driving and have nothing playing.
Is the ground wire already included in the VW cabling so that I have to pull it out of the harness or do I have to run a cable myself?
As for shielding I assume I can just take some electrical tape or is there anything else recommended?
Thanks in advance!

Hi kaitzo,
take a look at this thread of carjoying forum http://forum.carjoying.com/thread-24.html there is a link "solutions for radio bad reception" that can help for your problem too...
- radio1 subfolder has pictures about shielding wires
- radio2 subfolder has pictures about linking the iron case to GND

popeye70 said:
Hi kaitzo,
take a look at this thread of carjoying forum there is a link "solutions for radio bad reception" that can help for your problem too...
- radio1 subfolder has pictures about shielding wires
- radio2 subfolder has pictures about linking the iron case to GND
Click to expand...
Click to collapse
Hey, thanks for the reply, I already noticed that when I pull out the radio cable the noise is gone, so I am gonne give shielding it a try If that doesn't work, I will try connecting the ground wire.
I'll let you know if it helped solving the problem

kaitzo said:
Hey, thanks for the reply, I already noticed that when I pull out the radio cable the noise is gone, so I am gonne give shielding it a try If that doesn't work, I will try connecting the ground wire.
I'll let you know if it helped solving the problem
Click to expand...
Click to collapse
so I dont care about AM/FM radio. are you saying if you just left the AM/FM radio unplugged you would have no noise at all?

CadillacMike said:
so I dont care about AM/FM radio. are you saying if you just left the AM/FM radio unplugged you would have no noise at all?
Click to expand...
Click to collapse
Yes, leaving the antenna unplugged solved the problem for me, since I will be listening to Spotify most of the time anyway it might be a solution. Nevertheless, I will try to fix it even with the Antenna plugged in. Trying the ground method next, as shielding didn't help. I also found that the VW connector and the antenna connector which was included with the car not join each other all the way, so it is always a bit loose, but even with force I can't completely join them. I will let you know if I succeed.

And??
And after all you find a solution??? I’m with same issue

Having Same Issue
Hello there,
Sorry to revive this thread a few months late, but I am having the same issue and wanted to see if anyone had any ideas to fix it. I installed a Ownice C500+ radio head unit into a 2015 Nissan Murano. Everything functions perfectly and works great - expect for one thing. Whenever the volume is on, there is a very faint staticky sound in the background. It never changes tones or volume. It just always stays at the same pitch and doesn't go away. Aside from turning the sound all the way off, the only time it doesn't do this is when I switch to the radio - then the hissing disappears and all is perfect again. But if I am playing music via USB/AUX/Bluetooth, etc, (or if I just have the volume on with nothing playing) the hissing noise is always there. It is faint and hardly audible, so during driving it is no problem. But if, for example, I am listening to a soft song while stopped at a red light - then I can hear it and it is annoying.
I have tried to change the amplifier gain in the head unit because I figured that is what is causing the noise. However, it does not seem possible in the Ownice unit. The sound equalizer does not have "gain" as an option to change, I checked into Advanced Settings as well, also tried engineer mode on Android unit, plus downloaded some equalizer apps but nothing has fixed it.
Any idea on what is causing this and what I can do to fix it? Any help or suggestions would be greatly appreciated Thank you

Same here
TiberiusGavier said:
Hello there,
Sorry to revive this thread a few months late, but I am having the same issue and wanted to see if anyone had any ideas to fix it. I installed a Ownice C500+ radio head unit into a 2015 Nissan Murano. Everything functions perfectly and works great - expect for one thing. Whenever the volume is on, there is a very faint staticky sound in the background. It never changes tones or volume. It just always stays at the same pitch and doesn't go away. Aside from turning the sound all the way off, the only time it doesn't do this is when I switch to the radio - then the hissing disappears and all is perfect again. But if I am playing music via USB/AUX/Bluetooth, etc, (or if I just have the volume on with nothing playing) the hissing noise is always there. It is faint and hardly audible, so during driving it is no problem. But if, for example, I am listening to a soft song while stopped at a red light - then I can hear it and it is annoying.
I have tried to change the amplifier gain in the head unit because I figured that is what is causing the noise. However, it does not seem possible in the Ownice unit. The sound equalizer does not have "gain" as an option to change, I checked into Advanced Settings as well, also tried engineer mode on Android unit, plus downloaded some equalizer apps but nothing has fixed it.
Any idea on what is causing this and what I can do to fix it? Any help or suggestions would be greatly appreciated Thank you
Click to expand...
Click to collapse
Same issue here with a new Asottu Infidini Allwinner T8, with extra DSP chip included. Except that my hissing sound goes up with the volume. I will contact seller.

lorrys said:
Same issue here with a new Asottu Infidini Allwinner T8, with extra DSP chip included. Except that my hissing sound goes up with the volume. I will contact seller.
Click to expand...
Click to collapse
Sounds good, I will keep working on it as well - let me know if they happen to find out what is causing it

Same issue here : (

Solved!
Asottu provided an android 7.1.2 update weeks ago. The issue is gone now. It was not an MCU update. Just Android.

@lorrys
I'm glad that fixed it for your system - I will look for an update to the Ownice unit but I don't believe they have one to go to Android 7.1.2
traxformania said:
Same issue here : (
Click to expand...
Click to collapse
I did find a solution that essentially makes the problem almost disappear. If you have an Ownice C500+ unit, go into Settings, enter 1260 as password to go to hidden settings, enter the volume area, make all of those values as low as they can possibly go. Some of those will be in the negative. When you reboot the system, the sound is essentially inaudible and that solves the problem.

lorrys said:
Asottu provided an android 7.1.2 update weeks ago. The issue is gone now. It was not an MCU update. Just Android.
Click to expand...
Click to collapse
I have the same issue but with Toyota version of the unit. Can you share the update?

i think the issue is the am/fm antenna, get a noise filter antenna adapter, might solve the issue

hi, I have an eonon ga8161, it would be hct px3 7.1 if I'm not mistaken.
I also have the background volume problem, but it is almost inaudible.
the most obvious problem is a rustling metallic type rustling noise, which is heard when there is processing from a USB device, both pendrive and USB dashcam ... someone has had this problem, because it is very annoying