For the BT headsets audio quality, you should be able to change the audio mode as it might be selecting Headset (HSP/HFP) by default which is used when you need to use the microphone. Instead select High Fidelity A2DP mode which will stop the microphone working but give you the proper audio quality.
For the BT headsets audio quality, you should be able to change the audio mode as it might be selecting Headset (HSP/HFP) by default which is used when you need to use the microphone. Instead select High Fidelity A2DP mode which will stop the microphone working but give you the proper audio quality.