Audio Buzzing loud after a sound is played.

Hey guys, i've had this problem for a long time and i have NO idea what causes it to do this.

Here is an example of what I mean.

Audio Buzz.wav - Google Drive

I don't know what causes this, it'll do this after a sound stops playing or whatever else.

PC specs:
* Windows 7 Professional 64bit
* Intel Core i7 4790k at 4.0ghz
* 3 hard drives totaling up to 3TB
* Nvidia Gigabyte G1 Gaming GTX 1080 8GB
*32 gigs of corsair vengeance pro ram
*Acer Predator XB271HU bmiprz 27" WQHD (2560x1440) NVIDIA G-SYNC IPS Display 144hz(Primary Montior)
*Asus VX24A 23.8" 1440p LCD Monitor(Main Monitor)

a defective input connection? as in things aren't connected in all the way? i made sure everything was plugged in securely.

that's odd, my motherboard is an asus z-97a and to be fair it happened on a previous motherboard too, but i don't think it's the motherboard though, kinda crazy that same problem would show up on a brand new motherboard too out of no where.

well i did use the same case with a new board, however there is no front panel mic connection on this case however. all my connections are in the back.

also my MIC is a USB blue yeti. so it doesn't even connect to that at all and this happened even before i had my blue yeti.

do you think maybe it could be my speakers?

just tried it, and it still does that buzz noise when i stop it in audacity.