When I moved house and setup up my guitar and synth bits in the new place, I was treated to the most horrendous ground hum, staticy, zuzzing noise through the monitor speakers from the USB audio interface attached to my desktop DAW system. I never had this problem at the old place aside from a very small hum which a small Behringer Hum Destroyer/Suppressor fixed.This little iDefender fella removed most of the noise, leaving only a very faint electrical connection sound in the distance if you put your ear to the speaker and which you'd easily forget about when audio was coming through. So, it did the job it was supposed to do but it is quite expensive at £60.The reason I say "check you really need it" is because I did little more investigation and found a better and cheaper solution for my setup. As I had never had a real problem before, my Steinberg audio interface had always been connected to the Mackie monitors via mono 1/4" cables. Apparently, these are called Unbalanced. The Steinberg and the Mackies both support TRS (stereo) cables otherwise known as Balanced. No idea what all that means but professional stuff all generally supports Balanced. I bought a pair of TRS audio cables from Amazon (RUXELY 6.35mm TRS Instrument Cable) for a grand total of £12 and voilà. ALL the noise vanished. Nothing evident even with your ear up against the speaker. Didn't even need the Behringer.Problem solved. iDefender not required. iDefender returned. Balanced is clearly the way to go and I probably should have known this but I'd never had this problem before in the previous 15 years with all sorts of kit and different interfaces. Balanced TRS cables on everything from now on. That said, if that doesn't do it in your situation then the iDefender will likely get the job done.

This works. I was having trouble with Desktop GPU noise while attached from a USB audio interface to an External mixer for head phones. Noise from the Ground loop and this worked to fix the issue.

I was getting a horrible amount of ground loop noise coming out of my speakers from my USB DAC whenever my GPU was under a heavy load. I tried lots of other solutions but nothing solved my issue. After all the headaches, My recommendation to anyone would be building a sound system with equipment that uses balanced cables.However, if you're stuck with what you've got, this iFi Defender+ works wonders. I did not notice any decrease in sound quality or volume, and the GPU whine which used to be so loud you could hear it from 2 rooms away is almost entirely gone. I can only hear it if I put my ear really close to the speakers. I rated it 5 stars for performance but 3 stars for value since I think it's overpriced, but since it's a product without much competition iFi gets to charge whatever they want.

I bought this to solve a GPU noise issue and it works perfectly for that. I had to dock it one star because the USB-C connector fits too loosely and had to be reseated far too often, especially given the additional weight of a connected power supply.

After years and years of listening to stupid crackling sound from my PC I finally found the solution. It works perfectly when connected, keep in mind that you need to buy 5V adapter too. I connected this to my USB sound card which is connected with KANTO YU4 speakers. I'm finally enjoying in my music! 💪🏻 I recommend this product!