Buzz and crack with amp and preamp

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There is a buzz and crackling in my setup and I am wondering what the source is. I tried to investigate ground loop or RF-interference by placing ferrite beafs on the power supply cable and audio input cables.

Below a picture of my setup. Black cable on the right is speaker cable.

An externally hosted image should be here but it was not working when we last tested it.


What could be the problem causing the buzz and cracks in my setup? Sound fragment below:
Buzz: https://youtu.be/lbx_zSXU_70

When I unplug the ne5532 pre-amp, the buzz stops. The pre-amp shares the same earth. When i unplug the (white) audio cable from the pre-amp the buzz gets slightly weaker.
 
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