Hello trofimchyk,
Thank you for using Apple Support Communities! I understand that you're experiencing audio quality issues using Bluetooth devices with your Mac. You've come to the right place for help.
Try the following troubleshooting steps, testing if the behavior persists after each step:
If the behavior persists, the next step would be to reset your Bluetooth module. This step would disconnect all Bluetooth devices currently connected to your Mac. If you're using a wireless keyboard or mouse, you may want to consider switching to a wired device instead. You may also need to select the option to "Show Bluetooth in menu bar" from System Preferences > Bluetooth first. When you're ready, here's where to find that option:
- Press and hold Shift-Option on your keyboard.
- Click the Bluetooth icon at the upper-right of your screen.
- Click the Debug option in the drop-down menu.
- Click Reset the Bluetooth module.
Once you restart your Mac, pair one of the Bluetooth devices to the Mac again and test. Let us know what happens from here.
Cheers!