How to improve poor sound quality, how to solve breaking up music on headphones connected to mac via Bluetooth

I recommended a headphones usage as a headset, but when you listen to music using the headphones, you may suffer from the following symptoms.

In such a case, please review the following two points again.

The sound quality is too bad

Bluetooth defines a communication method that is tailored to the application, called the connection profile. For example, a profile for music(A2DP), a profile for a headset (HID), or a profile for a network (PAN).

The headphones I recommend also have a microphone function, and I wrote how to use it as a headset in another article.

If the sound quality is very poor, this connection method is likely to be a profile (HID) for voice calls rather than for listening to music.

Therefore, you can easily solve the issue by changing it to the profile for the music(A2DP).

Let's check the current situation, first.

Hold down the option⌥ key and click the Bluetooth icon on the menu bar at the top right of the screen. And check the details of the headphones you are now connected to. In this article, I am using Bose Frames as an example.

Then, I think that you can see the SCO as a codec at the part where the character is grayed out like below. In this case, change it to the codec for the music because you have connected with mac as headset mode.

macOS is using SCO as a codec.

Press "Open Sound Environment" preferences like below.

Let's make the input (microphone) something other than headphones.

If you select the Input tab of the sound environment, you can see that the microphone input is Bose Frames as you can see. Change this to HD pro webcam C920 and a different microphone, or a built-in microphone.

In this way, you can see that the codec has changed to AAC as follows.

Valid codec changed to AAC (for music appreciation)

I think that the sound quality was improved dramatically in this way.

The music is breaking up

Another symptom is that the sound quality is not bad, sometimes the sound is breaking up. 

In fact, this method also helps to improve the instability that Magic Mouse and Magic Trackpad frequently disconnect. Strangely enough, the Magic Keyboard has not disconnected so far.

How to use a terminal

The quickest way is to use the terminal. Launch the terminal, and type su command to change to root user, and then remove the property files (plist) such as /Library/Preferences/com.apple.Bluetooth.plist and com.apple.Bluetooth.plist.vMfJxYV and restart the mac.

Remove /Library/Preferences/com.apple.Bluetooth.plist*

Last login: Wed Apr 29 16:49:27 on ttys002

The default interactive shell is now zsh.
To update your account to use zsh, please run 'chsh -s /bin/zsh'.
For more details, please visit https://support.apple.com/kb/HT208050.
~ $ sudo su - root
Mac-mini: root# cd /Library/Preferences/
Mac-mini:~root# mkdir backup
Mac-mini: root# mv com.apple.Bluetooth.plist* backup
Mac-mini:~root# sync; sync; shutdown -r now

How to use the Finder

Alternatively, launch the Finder and press Shift+Command⌘+g to move the folder directly. Enter /Library/Preferences or /Library/Preferences.

Enter the location of the folder directly in Shift+Command⌘+g

You can then go to the folder, so please delete com.apple.Bluetooth.plist and com.apple.Bluetooth.plist.xxxxx.

In another arcile, I will explain in case of Windows.

That's all! Enjoy!