Strange undisabable echo

Armisss4

Reputable
Jul 31, 2014
2
0
4,520
Hello.
I've connected microphone to my pc, and I can hear echo while it's not in use: if i open something like audacity and start recording, the echo goes away. In the recording device "listen to this device" is checked off, and in realtek settings microphone playback is set to zero and muted. I couldn't get microphone to work on front plugs even after checking "front panel jack detection" in realtek, so it's plugged in to back plugs. Echo continues even if i disable both speakers and headphones in "playback devices".
How could i get this annoying echo off?
Thanks.