Why am I getting a crackling/static noise on my macbook air?

I have a MacBook Air (mid 2012) with version 10.9.5. I keep hearing a crackling/static noise every time there is Audio output.
The sound seems to be coming from the top left-hand corner closer to the 'esc' key.
I have no external devices connected and I have restarted multiple times. If I mute my sound the crackling/static also stops.
Any idea what I might be the cause and how I can fix it?
Thanks.

The iPod does not use a cellular network It uses only wifi.
Try:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Power off and then back on the router
- Reset network settings: Settings>General>Reset>Reset Network Settings
- Try when connected to another wifi network

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Why am I getting a crackling/static noise on my macbook air?

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