AE515 Soundbar, quieter sound when using headset + microphone

Hey,

I have a very strange problem. The AE515 play well and work well on the built-in microphone. If I connect headphones and listen to music, everything is OK too. However, if at this point I turn on an application that uses the microphone in the headset, I can immediately hear the volume of the music playing decreases and the sound deteriorates (less bass). When I turn off the application which is using the headset microphone, everything returns immediately to normal. It looks like the AE515 changed the operating mode when I use the microphone built into the headset? How to fix it?