Crackling sound in phillips 5.1 speaker system

adventureguy

Skilled
Hi,
I have a phillips 5.1 speaker connected to PC. Out of 5, I only connected 2 speakers. Problem is that when playing sound, everything is crisp. Bass is good. Speakers are good.

However when not playing anything, theres a very small crackling sound. I connected woofer to pc thru 3.5mm male to 3.5mm male cable instead of 3.5mm male to 2 male RCA cable given inside box.

What can I do to stop the crackling sound? The sound is there even though I turn the speakers to stand by mode thru included remote.
 
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