This fixed the horrible, high pitched 'whine' i was getting through powered monitors and headphones. Had tried various in line power conditioners etc, and they never solved the issue. I was about to employ an (expensive) electrician to try and fix the problem, and I found a video on YouTube about this product, and how it fixed the exact noise i was getting.Found a used one on here for £30, plus a cheap 5 volt power supply for £10. Plugged all audio items into a single 6 way power block, and put the iDefender on the usb input on my PC that my Audio interface was using.
You HAVE to use it with the power supply to lift the earth on the interface.
Eliminated the ground loop from my PC laptop.
The laptop is interconnected with many analogue and digital audio devices. Considering the iFi was placed on the MIDI part of the setup it did a good job of suppressing the noise coming through from the USB C port.
Thanks.