CCTV audio buzz

Joined
17 Mar 2016
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United Kingdom
Hi Guys,

I have installed a 4 camera CCTV DVR system and when watching real-time or recorded footage, there is a buzzing on the audio.

I have checked the cameras and cables and all seems ok. Does anyone know how I can eliminate this problem?

Cheers
 
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More information required ?
Is it a swann kit - cheap quality dvr lots of issues.
How are you watching - via monitor , app or pass through tv system
Have you got audio on any cameras
Have you ran cables in loft next to 240 v mains cables
 

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