Solution:
Bluetooth does not support high quality audio in combination with a microphone.
for stereo audio playback there is used the A2DP bluetooth-protocoll and the so called ,,Stereo-Profile"
if you are starting to use the mic, the protocoll will chance to HSP ,,Handsfree-Profile". This is why the quality drops down. you can not use one bluetooth headset for receiving high quality audio and speaking.
i know its a shame after all the high tech stuff there is no possibility to get high quality mic and stereo sound with 1 bluetooth device....
teamspeak automatically uses a handsfree device. you have to change this in settings. for best results use a speaker or good headphones for sound and a external mic for speaking.
any questions?
greets
