Strange Clicking Noise Coming Out Of Speaker?

i have strange clicking or cracking sound intermittently. it look like a static interference noise (but it is not a static interference) this is worst when i'm listening to a video on Internet.

clicking or static could be hear, even when the video as stopped. look like the system can't keep up i played with the sound mixer. i got many applications running at the same time that sent me sound indicators

the clicking sound is lowered when i lowered the sound on the : "sound system", leaving the others on the max level. when clicking or static do occurs, i could clearly see on the system sound level bar, the increase or the movement that occured in the "system sound" application

this is clearly an electronic or drivers problem, not a speaker or physical one