I have tested with:
- iPhone XS with iOS 12.3.1
- iPad Air 2 with iOS 12.3.1
- iPad 4 with iOS 10.3.3
Got the same result with all of them.
Good sound but after a few seconds it gets terrible.
So it has to be the headphones that are telling the iOS to switch to HFP.
They work fine the wire and with Android devices.
How do i fix this?
I am not a Bose person and I do not obviously know what the code does on both sides, but I am going to take a guess here that as the QC35ii is a receiving device (unless Bose suggests otherwise in a reply here) and does not send a command to the Apple device to switch BT profiles. There may be some application running on the Apple in the background that uses HFP and sends a command to the Bose to switch the profile. Let's go ahead and eliminate that as a possibility.
Go to SETTINGS, GENERAL, BACKGROUND APP REFRESH and set it to OFF. Now I am not 100% certain (as I don't program iOS apps) that there still not 'stubs' of apps still running that could send out HFP profile change commands, but by turning off Background App Refresh, we should be more likely certain that only your music playing app is running. If it still switches to HFP, we have at least tried something to see if it helps.
Thank you for trying to help.
But unfortunatly it didnt work.
Turned the background app refresh off, rebooted the iPad and its still the same.
Managed to test on yet another iPad. An iPad 2 with iOS 9.3.5. Same thing happened.
On my windows10 laptop works fine.
in that case we are left imho with the following possibilities:
1. it is specific to your particular QC35ii since mine does not exhibit the same behavior (though I do use a different Apple phone). Only way to verify that is to try a different QC35ii.
2. it is still something associated with iOS or a resident 'stub' associated with an app which is independent of Background processing that is causing the sound to be output with the HFP profile. The only way to determine if it is iOS or an app is backup your whole phone. Reinitialize the phone to factory settings and then play the music. If it still happens it's iOS - if not it was one of your installed apps which interfere even if that app does not appear to be running. You can install the apps one at a time until it happens or you can restore your backup and remove the apps one at a time to narrow it done.
3. it is not HFP that is causing the sound change but something else in A2DP mode - only way to check that is try playing the music with something else such as the app I use - Ecoute. Or you can try a video app to play music like Youtube.
4. Since you windows 10 laptop plays fine (I have a windows 7/64 laptop that plays fine), then try a different iphone like a 7 or 8. If they also have the problem that it is definately an Apple issue. If the 7 or 8 works then it has something to do with your XR and iPads in particular or all of that class in general.
I’ve tested my iPhone with 3 different QC35ii and all worked fine.
Tried my QC35ii with Apple devices from other people and had the same problem.
So, the problem is defenitly on these specific headphones.
What do i do?
How is Bose going to solve this?
Oct 28, 2019
I had the same issues and then found out it was the accessibility setting. You might have the audio on your iphone set to "mono audio". Settings-general-accessibility, then turn it off.
Dec 4, 2019
Man I just bought the QC 35ii. Same muffled sound that you’re describing with iPhone X. I use the cable to connect it and the sound changes for the better. As soon as I use Bluetooth, it’s very muffled! Help! I also had the 700s and they were muffled as well, I just thought it was an issue with the 700s.
Apr 17, 2020
I had this issue on my Macbook for a long time and figured that the only way to solve this is going to the Preferences - Sound - Input and switch the microphone from Bose QC35 to MacBook Pro Microphone. Then sound went back to crisp and perfect as usual.
Still, it is annoying and should not happen. Is there any way to fix this?
Aug 13, 2020
Hello.I became the proud owner of the Bose QuietComfort 35 II, it was a little saddened that these headphones reproduce music from the Apple music service very mediocre.
I don't know who to blame, whether the quality of the music itself was poorly remastered, or the bitrate of the Apple music service is not very large. Music from this service is played in places with a bang, as if listening to vinyl. Or I just had no luck with the headphones. But as soon as I transferred the music in the Apple Lossless format to the iPhone, then everything became very good. No crackles.
What do you advise? Change headphones or,get used to the fact that nothing can be changed or listen to Apple Lossless?
I read somewhere that the quality will improve if listen on the wire. But, I didn't buy these headphones for that to listen to music with a wire
Sep 19, 2020
This solution solved my problem. I was unable to listen to audio on my laptop via Bluetooth for weeks due to the low quality, not knowing that the Headset Profile was on. Switching to Stereo got me back to good quality Bluetooth audio again!
I clicked on the volume setting to make the adjustment, on my Thinkpad PC (Windows).
I would recommend taking a look into your mobile devices A2DP Stereo Audio settings, your IOS devices may be automatically using a Headset Profile (HSP) or Hands-Free Profile (HFP) resulting in the poor and low audio quality. For information on what profile the phone supports refer to the manufacturer of the device to see what options are available in order to ensure you have the A2DP Stereo Audio so that you have high quality sound through the headset.