naquaada Posted August 5, 2016 Share Posted August 5, 2016 I had already on my Leopard system a humming every time I scrolled in the browser or moved a window. On my Core i7 Mini-ITX system I had this problem too, but not so strong. But on my Xeon Mini-ITX system with a Radeon HD4870 it was extreme - every time scrolling in the browser I had a loud humming, it was inacceptable. But it was no problem of OS X, I also had it in Windows. So I searched a bit about this problem - it may appear due to interferences with the power supply or other devices in the area. In a Mini-ITX system the power supply and the graphics card with its fan (which is not always active) are rather close to the audio chip and the audio output. So I bought a Ground Isolator Monacor FGA-30M for about 15 Euro. It has a 3,5 mm jack to RCA plugs and a cable with about 115 cm length. The device uses a small passive transformator with 1:1 ratio and is simply plugged like a normal cable. The result: No more humming, even if I turn the volume of my mixer and my amplifier very loud. It is really a worthy investion to improve audio quality, I presume it also would be useful for vinyl. There are different version of Monacor Ground Isolators with different connectors. Greets, naquaada. Link to comment Share on other sites More sharing options...
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