Hello guys,
I'm facing a problem and I simply can't seem to find any info on the web on how to go about fixing it...
There is a sound quality issue when I connect my Huawei P8 Lite to my Alpine UTE-72BT Head Unit. Aside from the fact that it keeps disconnecting at random, it sounds as though the bitrate isn't high enough on transfer, thus producing sort of a "crackling" effect on the highs (something similar to clipping). I've also read that some other users have experienced issues with bass being much louder, although I can't say for sure that this is the same case.
It's regardless of the music source, be it internal storage, with 320 kbps mp3s (converted from FLACs) or Spotify on extreme quality (both from downloaded and from streaming on LTE). I haven't faced the same issue with a Microsoft Lumia 640, for example, and neither with music played from USB, so the issue is isolated to the P8. The issue seems to "fade away", so to speak, if connected to the phone via AUX cable (Cordial cable, high quality, as well). The fact of the matter is that: 1. Music played over AUX tends to be more dull, as if though it applies a wide band pass filter and 2. AUX lacks the ability to control phone media via the headunit, which makes the point of having a bluetooth player absolutely pointless.
So far, I've tried the following:
- deactivate wireless - as I've heard speculations of bluetooth and wireless being combined into a single chip;
- use EQing apps, such as Dolby Atmos (actually, this was the moment I noticed the crackling, on account of the fact that highs can be controlled much better with Dolby's app);
- Update firmware on HU (more like a refress, to be honest. I was already running the latest bluetooth firmware);
- Updated to Marshmallow (B550);
I'm guessing that there is some issue with the codecs used to transmit data to the player, although I wouldn't know how to go about modyfing them, as the only resource I've found, up to now, is related to a Samsung S2. Counting on the fact that there might be some OS modifications (in what regards coding standards and such), I consider that the resource would not be very helpful.
If there's anyone out there willing to help me find a solution, I would very much appreciated, and, also, if there is any info that I have omitted, please don't hesitate to ask. Thank you!
Related
First of all, thanks to Cyanogen and contributors for his G1 and N1 ROM's.
Recently, I've been using FLAC for music playback ripped from my CD's for tracks that I want lossless (especially for classical music). Most of the time, I'm using my Motorola S805 (Bluetooth) for the cans that I got on Black Friday back in 2009 from Newegg for a low price of $20 USD, shipped. -- Best money I spent for Black Friday Granted they're normally overpriced but they perform fairly well for the price I paid.
So after using FLAC and the S805 on my ASUS notebook which has built-in Bluetooth, I moved some of the FLAC files onto my Nexus One and paired my S805 to the N1 and started some FLAC playback...
The difference in quality blew me away. It's so much clearer playing back FLAC files on the N1 to my S805's than it ever was using VLC under Windows 7. I'm at a loss on why the difference. -- Yes, I've attempted to adjust the "volume" on both the Windows Mixer and the S805 internal volume controls as the same on the N1. There's virtually *no hiss" when playing back FLAC files on the N1 than on my ASUS notebook. I have a very noticeable "elevated" noise floor on the ASUS among "compression artifacts" which I don't think I should have.
Does anyone know what might be the cause?
Thanks!
Cheers,
Kermee
Happened to come across this so I'll reply even though it's quite old.
The audio output on the Nexus one is average. I believe you can find the frequency graph of the Nexus One at the gsmarena.com review of it. So while it's not stellar, it's not bad. More than likely you're hearing a difference because your notebook's output is low quality.
Notebooks generally have poor audio quality and tend to generate a lot of noise. You'll especially notice it when your computer is under load or when you plug it into a powersource. It's like electronic interference, afterall everything on the laptop is packed together pretty tightly. The other reason is just poor hardware. Sound gets neglected frequently on notebooks. The best solution is to pickup an exteranl soundcard (I know soundblaster makes a few usb ones) or even better get yourself a usb DAC (digital analog converter) and a headphone amplifier. ibasso.com has several versatile ones.
Goto head-fi.org for some audiophile info.
pongalong said:
Happened to come across this so I'll reply even though it's quite old.
The audio output on the Nexus one is average. I believe you can find the frequency graph of the Nexus One at the gsmarena.com review of it. So while it's not stellar, it's not bad. More than likely you're hearing a difference because your notebook's output is low quality.
Notebooks generally have poor audio quality and tend to generate a lot of noise. You'll especially notice it when your computer is under load or when you plug it into a powersource. It's like electronic interference, afterall everything on the laptop is packed together pretty tightly. The other reason is just poor hardware. Sound gets neglected frequently on notebooks. The best solution is to pickup an exteranl soundcard (I know soundblaster makes a few usb ones) or even better get yourself a usb DAC (digital analog converter) and a headphone amplifier. ibasso.com has several versatile ones.
Goto head-fi.org for some audiophile info.
Click to expand...
Click to collapse
This doesn't explain why Bluetooth headphones, completely disconnected from the computer, sounds bad
I'd say the most likely reason is some difference of A2DP implementation between the two. Maybe the standard Bluetooth stack on a computer lacks polish on this part.
Well the N1 isnt a good audio player at all since the frequencies are cut off. Also flac really wouldnt make a difference until you buy a high end set of headphones (UM3x, Ultimate Ears Triple Fi 10 etc.) and a source to match it (nice DAC, amp). Instead of wasting all the space on flac you should just go for vbr or the like since bluetooth will not be able to fully take advantage of it. Head-fi is a great place to start, but be careful since your wallet will hate you if you really do start getting into buying nicer headphones.
If you're just using your nexus one and an A2DP headset, there isn't a difference in audio quality between a file ripped at V0 bitrate and flac. You're only going to really hear the details a FLAC file has with a high end audio setup or good headphones with an amp, and your nexus+the motorola headset do not fall into those categories It isn't a criticism of your setup, they literally cannot reproduce the details.
As far as your question, it might have to do with the bluetooth stack as well as the hardware/interference in your laptop, but that's just a guess as I'm not too knowledgeable on the workings of bluetooth audio.
The N1 is barely a year old, and since it's designed primarily as a phone, it should have a fairly new Bluetooth radio and stack, probably much newer than whatever you have bundled in your Asus laptop. In fact both the desktop dock and the car dock use Bluetooth to stream the audio to the auxiliary audio port, which may seem a bit roundabout to audiophiles, but thanks to the new hardware there's very little noticeable loss to the average consumer, and it makes it easier to connect and disconnect from the dock.
That said, being such a new technology, Bluetooth has only recently improved to the point of being a decent quality source for streaming audio. I have an old USB Bluetooth adapter in my desktop that I bought right about the time when A2DP was first available, and its audio quality is pretty bad, too. And like any standard for streaming data, Bluetooth's perceived streaming quality is highly dependent on the hardware on both ends, meaning that the maximum quality you'll get is that which is achievable of the older of the two devices.
Any audiophile will tell you that if you want true quality, you should just ditch wireless technologies altogether, which I too have done. But for your purposes, and in the interest of saving money, you can bring your laptop up to par with your N1 by simply installing a new Bluetooth stack, or, if that doesn't work, buying a new USB Bluetooth adapter, preferably one that is advertised to work well for music.
Wow. I completely forgot about this thread. LOL.
I figured it out in the end what was happening. -- The negotiated 'bitpool' setting between my Windows 7 BT stack and the A2DP headphones was somehow negotiating at the "min" which was somewhere around the low 30's. Using some BT diagnostic tools on my MBP (different machine than the ASUS Windows 7 machine), I found the "max" bitpool rate which the A2DP headphones supported was 53.
I found out that the N1 was connecting to my A2DP headphones at the "max" bitpool rate which my headphones supported. The sound quality between a bitpool rate of "53" vs "30" is huge. Hence why playback on the N1 sounded so much better.
I never did find out how to force the 'bitpool' rates in Windows 7 and gave up. I did under Snow Leopard 10.6 on my MBP.
Cheers,
Kermee
The default Microsoft Bluetooth stack in Windows 7 does not include the ability to change the bitpool settings, nor does the standard Broadcom WIDCOMM stack.
Most people opt to use the BlueSoleil Bluetooth stack for more advanced functions, and I can confirm that BlueSoleil does have the ability to adjust bitpool settings. Unfortunately the product costs about $25, and you will need to check to make sure that BlueSoleil is compatible with your laptop's integrated Bluetooth.
Ok, I just have to put this out there, unless you have a very good sound card, a good amplifier, and good headphones, there is no reason to use FLAC audio files unless you just feel like wasting HD space.
Bluetooth audio has really bad bitrate and won't even come close to flac.
wolfcry0 said:
Ok, I just have to put this out there, unless you have a very good sound card, a good amplifier, and good headphones, there is no reason to use FLAC audio files unless you just feel like wasting HD space.
Bluetooth audio has really bad bitrate and won't even come close to flac.
Click to expand...
Click to collapse
I agree bluetooth audio quality leaves a lot to be desired. It is so nice to be able to drag flacs over to the phone and listen, though. Definitely one of my favorite features of Android and that 32gb card investment made it happen!
Hi guys
i read xda so much, but i don't write as well
i have a big issue with my galaxy s 2
i use a bt car stereo, with a2dp and avrcp support
i used to stream all my music collection from my iphone4
now i got my sgs2 and i love it... but
the audio stream looks "limited"
it seems a bandwidth issue, or i don't know a quality issue
with iphone4 i streamed at full quality, now the sgs2 sounds a lot worst
other than that, i have to disable wifi because if on, the music is choppy and skips a lot
with wifi off, the stream goes well, but it sound bad...
sorry for my not so perfect english... i hope there is a way to improve sound quality because i "live" with a2dp on in my car...
That's strange. My a2dp stream actually sound better from sgs2 than it does from my ipod touch 2nd gen, iphone or my computer (bluez).
Receiver is a belkin stereo a2dp receiver.
Are you sure that it's not in handsfree mode? Long press the a2dp device in bluetooth settings and there should be an option to select it to be a media device, make sure it's checked.
thanks for the reply gvoima, no it's in media device mode
i think the problem is the bitpool
i've got the same problem of this guy: http://forum.xda-developers.com/showthread.php?t=708685
there is an mp3 sample of the problem in the first page
gvoima said:
That's strange. My a2dp stream actually sound better from sgs2 than it does from my ipod touch 2nd gen, iphone or my computer (bluez).
Receiver is a belkin stereo a2dp receiver.
Are you sure that it's not in handsfree mode? Long press the a2dp device in bluetooth settings and there should be an option to select it to be a media device, make sure it's checked.
Click to expand...
Click to collapse
I got a belkin stereo receiver as well, but it sounds bad and choppy, just like the topic starter described. Though still compressed (this is a known issue for A2DP due to bandwidth limitations) songs sounds much better from my Nokia E52 work phone.
rikc said:
I got a belkin stereo receiver as well, but it sounds bad and choppy, just like the topic starter described. Though still compressed (this is a known issue for A2DP due to bandwidth limitations) songs sounds much better from my Nokia E52 work phone.
Click to expand...
Click to collapse
The "but my (insert phone) worked better" isn't really valid. For as many people who make that statement there are an equal number who are shocked that the SGS2 works where other phones haven't. This is kind of like the Wi-Fi issue. When two pieces of equipment don't interact well you can't just blame one of them.
In my car and on my Yamaha YSP-4000 the SGS2's Bluetooth works better than any phone I've used. That includes the HD2, G2, and G2X. The sound is much more defined and headset controls (random and repeat) show available for the first time. The SGS2 also feeds track info to the car which none of the others did.
Bluetooth connections and sound quality are always a big YMMV.
My Sony MW600 sound great, I use to have a Motorola Defy , and it use to have an "Enhanced Stereo" option in the blue-tooth menu, the Samsung S2 does not have this option.
@BarryH,
Oh I know, I not blaming the SGS2. I only think the SGS2 out sound to it's output module which is somehow less suitable for the kind of compression, maybe set by the Belkin module. Actually I'm currious if there would be ways to change the way the SGS2 sends sound signals via A2DP
rikc said:
@BarryH,
Oh I know, I not blaming the SGS2. I only think the SGS2 out sound to it's output module which is somehow less suitable for the kind of compression, maybe set by the Belkin module. Actually I'm currious if there would be ways to change the way the SGS2 sends sound signals via A2DP
Click to expand...
Click to collapse
LG's implementation of Bluetooth drove G2X owners crazy. Check out this thread from the G2X forum...
http://forum.xda-developers.com/showthread.php?t=1117769
Maybe it will help. The only other solution for the G2X was installing an AOSP ROM.
Well, I tried it (Bluetooth Fix Repair), but off-course that tool is for a problem the SGS2 does not have.
From the tinkering I've done now I know.
- Having MusicFX installed does not make a difference
- Video players running ffmpeg codec do also not make much difference in sound quality
- The -type- of file does make a difference, i.e. low bitrate files play better
This makes me think, is there a music program which can resample/recode music before playing. I'd rather have software do that than A2DP do it badly, or is mono output (other than all the tools enabling playback on mono headsets which is for pre-A2DP headsets and thus something else) possible?
Edit /system/etc/bluetooth/audio.conf
Uncomment "Master" option and set it to "True".
Uncomment "MaxConnections" and set it to 3.
Most Android devices have this file configured poorly by default, those 2 settings should help though.
I'd suggest also enabling HFP and AutoConnect.
Great! That definitly reduced creaking/noises and even the occasional stuttering music!
Since you seem to know your stuff, would there be a way to send a mono signal to (only) the A2DP stack and would this decrease the 'tin can' effect? I'd rather have better upper tones than stereo.
knightnz said:
Edit /system/etc/bluetooth/audio.conf
Uncomment "Master" option and set it to "True".
Uncomment "MaxConnections" and set it to 3.
Most Android devices have this file configured poorly by default, those 2 settings should help though.
I'd suggest also enabling HFP and AutoConnect.
Click to expand...
Click to collapse
Thanks for the suggestions...going to try this and see if the sound quality improves in my car stereo.
Till now the best A2dp sound quality was on my Nexus S, but that was with the help of custom rom development and vodoo sound. Worst was the g2x.
Sent from my GT-I9100 using XDA Premium App
Ok guys, I think I might have... accidentily... run into a phenonemon.
I tested my phone on a Creative D100 wireless speaker it it went great, no tin can sound, no hickups.
This proved to me that there had to be something wrong. Now when I was posting here earlier I was listening a lot to music and at a certain moment I thought... wait I'm not hearing a tin-can sound anymore. However, later on while testing I heard it again so I thought I imagined it.
Powering off the phone and powering on again I was able to create this again. No tin can sound... however a lot of hickups (as if a lot of data had to be sent and it didn't quite fit). I made a call to my work phone (sound on the handset) to test and then the tin can sound was there again, no hick ups anymore though. Strangely enough a haven't been able to replicate the 'no tin can sound but hickup situation' though by powering off and on again. Tried after playing on the Belkin on the D100 again and no problems at all, great sound and no hickups whatsoever.
It appears to be a bigger issue with android connected to the bitpool setting the bluetooth receiver desires...
http://forum.xda-developers.com/showthread.php?p=14944891#post14944891
Let's hope the upcoming Cynogen can fix this issue.
I too felt that the A2DP sound quality on the Nokia BH103 is crap as compared to my Nokia 5800 (sounded even better than stock wired headset). It also uses a lot more battery, I find mediaserver using a lot of battery.
How do we escalate this to Samsung?
knightnz said:
Edit /system/etc/bluetooth/audio.conf
Uncomment "Master" option and set it to "True".
Uncomment "MaxConnections" and set it to 3.
Most Android devices have this file configured poorly by default, those 2 settings should help though.
I'd suggest also enabling HFP and AutoConnect.
Click to expand...
Click to collapse
Sorry, i'm on darky rom and i don't find this file, could someone help me out ?
Thanks
Is there any way to fix the bluetooth audio quality other than switching to a CM-based ROM?
My old phone over bluetooth sounds fine. My S4 via a wired connection sounds fine. My S4 over bluetooth sounds like everything was sampled at 32 kHz. All other equipment is the same, so I'm relatively sure it's a bluetooth-specific issue. My girlfriend's S4 does the same thing.
So, any fixes? I'd really like to avoid switching to an aftermarket ROM right now.
Edit: L337 on AT&T
Tourney3p0 said:
Is there any way to fix the bluetooth audio quality other than switching to a CM-based ROM?
My old phone over bluetooth sounds fine. My S4 via a wired connection sounds fine. My S4 over bluetooth sounds like everything was sampled at 32 kHz. All other equipment is the same, so I'm relatively sure it's a bluetooth-specific issue. My girlfriend's S4 does the same thing.
So, any fixes? I'd really like to avoid switching to an aftermarket ROM right now.
Click to expand...
Click to collapse
Random guess: Could this issue be caused by the adaptive sound feature? I'm not a true audiophile, but I haven't noticed a problem through my receiver in the car or at home.
Try playing something with cymbals and a lot of treble. Turn the volume up a bit higher than normal while still maintaining a reasonable level. The cymbals sound like someone is smacking a plastic grocery bag with a stick instead of being crisp and clean like they should be. I can then disconnect the S4, connect my old phone, and play the same mp3 without any sound distortion. Or I can play the same mp3 from the S4 via aux and it sounds fine.
Try it on both bluetooth and aux. If you truly don't notice a difference, I guess it must just be my phone. If it does do it however, you definitely don't need to be an audiophile to hear it.
My old phone had the exact same problem until I moved to JB on a CM build. The problem there is well-documented as existing on the S3 (try looking up bitpool settings), but I kind of figured they would have fixed it by now. I'm coming from the world of HTC, so I was hoping there is a fix for Samsung.
Sorry to revive this thread, but I have an update.
My car has built-in bluetooth for phone only, so no a2dp. I have a third-party bluetooth adapter that I'm using for music.
I've found that when both of these are connected, the audio quality (especially on trebles and guitars with distortion) is absolutely terrible. That was the point of my original post. Since then, I've determined that this happens ONLY when I am paired with both my car and my third-party bluetooth. I can actually pair and unpair from my car in real time and hear the audio quality immediately get better/worse. The quality gets worse immediately when it pairs, even if the car bluetooth is not in use (but still connected).
I've verified this is the case with both my phone and my girlfriend's S4. Can anyone with such a setup verify this does or does not happen for them? I'm thinking this is a bug with the bluetooth stack, and it'd be nice if it could be fixed. If anyone can try pairing to two different devices and confirm my problem, I'll start a bug report with Samsung. Otherwise I'll try another bluetooth adapter for a2dp.
On my G6, I have really terrible audio quality over Bluetooth connections, I've had two separate G6s, of different colors, received weeks apart, and they both suck for Bluetooth audio, especially my Sony car stereo, and LG Tone Free... can anybody else report on their experience? Does your LS993 sound awful on your Bluetooth devices?
Have a fairly new G6 bluetooth og Bose earpiece working very well, also on 2010 F150 pick up and 2012 Buick no audio issues. Audio has been fine so far.
Mine also is pretty poor. The volume level is about half the level of the satellite radio or fm stations in my car
Hello all.
I had G2 in the past and I use to listen music in my car, using Bluetooth connection to Pioneer head unit. I have Spotify premium account and I have my Playlist downloaded with the best quality. However once I got G6 a week ago I noticed that audio quality from the g6 with the same songs, same Playlist, same Spotify account, is not as good as it was with g2. So I did a short research and found a thread in the net where people reported the same problem.
A guy from the thread suggested to disconnect all other Bluetooth devices from the phone (like smart watch or band) and actually that solved my problem. I have MiBand2. Once I disconnected it the audio quality became as good as before.
So guys, if you have a smart watch, try to remove it and check the quality again. I hope that helps.
I went a couple of months with no issues on my Kia Optima, then suddenly, I started getting really bad aliasing on the highs. As said above, I turned off my Huwaei watch and the sound was normal again. After a bit, I turned my watch back on, and it remained fine.
I had it happen once again many weeks later; and again, a quick off - wait - on, cycle with the watch fixed it. So whatever it is, seems to be a bandwith allocation issue with the bluetooth software. From March '17 thorugh almost Sept '17 and I've only had to do this twice? I think I can live with this.
Hey heres something for you to try..
Download WiFi Scanner from App Store.. Look at your 2.4ghz networks.. then keep in mind your cordless phones, IP Cams, Walkie Talkies, baby monitors in your area.. You may be a victim of signal interference.
Bluetooth operates on the 2.4ghz spectrum along with a TON of other devices now available.
Your sony stereo may be the culprit.. if is an aftermarket "Xplod" deck
Im an audiophile, and my G6 runs better than my Samsungs.. (also no issues with the "preventative volume warning"
What you also may have is an app that is causing the volume to lower...
For example.. when i stream the music player with the stock app, sometimes Snapchat notification sounds cause the rest of the volume to be lower..
Google Maps is another one that can hijack the sound but you can control in settings.
For using music try a different app ( i use Maple Player) and it works great ..
Based on your experiences i think its something outside causing the problem to be honest. but thats ALOT of trial and error to deal with.. if worse comes to worse- you can always get an aux jack bluetooth adapter for your car stereo if it IS the stereos bluetooth receiver .
I have posted questions about getting the unit on another forum but thought I'd post my experience, findings and also any questions raised to both help others and maybe get answers and help.
I went with the Erisin Es5060pb. Its the best spec I could find. Runs full android 6.0. Octa core processor. 2gb ram. 32gb storage.
Overall it went in much easier than i thought, simply plugging into the standard connector. We wired the included ext mic and routed it close to my head in the drivers seat. Routed the gps antenna close to the windscreen. I also connected the rear usb and put through a hole in the glove box which I connected the separately bought 3g dongle (might eventually just use wifi tethering from my phone) and that works well.
The amount of things it does are fantastic. Dvds, cds, usb thumb drives for both music and videos, and the same for micro sd. Google maps work ok, see below, as does youtube.
Issues -
1) The radio sounded terrible at first and needed a lot of tweeking in the equilizer app. Much better now (still not great though) but oddly is a little better with music played from files. I can't find an app that actually uses the FM antenna to see if it's better. It is also odd that any app's equilizer such as Pi Music player effects only that app and the radio is only affected by the inbuilt equilizer.
2)The fader thinks I'm in left hand drive so doesn't sound right if changed to only driver. Also when moved to only rear speakers it also still plays in the front centre, only turning off the front sides
3)When playing audio /video while accessing Internet via either wifi or data, (such as a YouTube video) there is low volume interference in the background. After a while this stopped but was annoying.
4)Due to having the 'Loud' option enabled in the inbuilt equilizer app which improved sound not just volume, it is only for music such as the radio, all other sounds are much lower. This means that if i have google maps on while playing the radio, the Google maps voice is way too low. By turning the volume up it increases but so does the radio which then gets too high.
5) due to all the messing with audio i have started to realise that i havent got a clue how to get the best out of an equilizer. i prefer the 'pop' type config of a higher setting on the middle sliders and a bit lower either side but i just cant get it right. any suggestions?
Hopefully this helps others and if anyone can help with any thoughts on the issues , I'd appreciate the help
Marc
anyone?
marc.knuckle said:
I have posted questions about getting the unit on another forum but thought I'd post my experience, findings and also any questions raised to both help others and maybe get answers and help.
I went with the Erisin Es5060pb. Its the best spec I could find. Runs full android 6.0. Octa core processor. 2gb ram. 32gb storage.
Overall it went in much easier than i thought, simply plugging into the standard connector. We wired the included ext mic and routed it close to my head in the drivers seat. Routed the gps antenna close to the windscreen. I also connected the rear usb and put through a hole in the glove box which I connected the separately bought 3g dongle (might eventually just use wifi tethering from my phone) and that works well.
The amount of things it does are fantastic. Dvds, cds, usb thumb drives for both music and videos, and the same for micro sd. Google maps work ok, see below, as does youtube.
Issues -
1) The radio sounded terrible at first and needed a lot of tweeking in the equilizer app. Much better now (still not great though) but oddly is a little better with music played from files. I can't find an app that actually uses the FM antenna to see if it's better. It is also odd that any app's equilizer such as Pi Music player effects only that app and the radio is only affected by the inbuilt equilizer.
2)The fader thinks I'm in left hand drive so doesn't sound right if changed to only driver. Also when moved to only rear speakers it also still plays in the front centre, only turning off the front sides
3)When playing audio /video while accessing Internet via either wifi or data, (such as a YouTube video) there is low volume interference in the background. After a while this stopped but was annoying.
4)Due to having the 'Loud' option enabled in the inbuilt equilizer app which improved sound not just volume, it is only for music such as the radio, all other sounds are much lower. This means that if i have google maps on while playing the radio, the Google maps voice is way too low. By turning the volume up it increases but so does the radio which then gets too high.
5) due to all the messing with audio i have started to realise that i havent got a clue how to get the best out of an equilizer. i prefer the 'pop' type config of a higher setting on the middle sliders and a bit lower either side but i just cant get it right. any suggestions?
Hopefully this helps others and if anyone can help with any thoughts on the issues , I'd appreciate the help
Marc
Click to expand...
Click to collapse
I have a lot of problems with this device, too. I'm using the custom rom from Malaysk.
1. FM signal and sound quality are terrible. I think there is no way to optimize.
2. If I'm connecting an usb-device while music is playing, music begins to stutter for a little time until the usb-device is loaded.
3. Bluetooth streaming quality is very poor! This was the reason why I had installed spotify directly on the unit.
4. Bluetooth pairs only every second time of unit boot to my mobile phone. Sometimes you have to connect manually...
5. Wifi connections sometimes can't be established although strong signal is available.
6. By using a 3G dongle for mobile internet, the unit freezes sometimes so you have to reboot it... I think this is caused by changing the cellular power of the dongle (3G/2G, 2G needs more power)
Im afraid i haven't had any of those issues. My sound issue was sorted by removing the 7th speaker that should have only been used for voice like factory sat nav.