iFi Audio Digital Enhancer iDefender USB C to A Ground Loop Device

Had major ground loop interference noise from the USB output of my computer connected to an Onyx Producer 2+2 audio/midi interface, plugged into a Kawai piano feeding iLoud monitor speakers.The iDefender + solved the problem. The noise was killed and I'm very happy with the result.Purchased a CanaKit 3.5A USB C power supply to make sure the interface had adequate power.

This stopped the buzz and interference sounds that has been in my studio for years. I will say this is the best product I bought in 2023 😊. Cheap but powerful too for noise in the studio. I tried expensive products before this and none of them worked. It was delivered earlier than expected and no complaints. I strongly recommend this product and seller.

I have an Focusrite Scarlett 4i4 external audio interface, which (important!) draws its power from its USB C connection to my computer's USB hub. I noticed that whenever I connected my piano keyboard's MIDI interface to my computer (also via USB), then the Focusrite added a 2400 Hz hissing sound to any signal routed into its Audio In. The reason was that this MIDI interface disturbed the ground signal in the USB system, which the audio interface needs to properly interpret the Audio In signal. Changing the MIDI interface (MIDI to USB) didn't change the problem, as the ground was disturbed already in the piano.This iFi Defender, removed the hissing sound completely. Two important things to consider: (1) I plugged the Defender between USB hub and the piano's MIDI interface (!), not between USB hub and Focusrite audio interface. (2) Make sure (!!!) you add a 5V (!!!) USB-C signal into the Defender's side; without it, the hissing doesn't go away; higher voltages short-circuited my system, causing me a major scare.So take a regular small (!) cheap iPhone charging block for this 5V side signal. I first used just some free USB power slot from my high-end Anker charger, which usually provides only as much power as needed, but more than 5V in this case apparently; here this literally overpowered the Defender and caused a crash; so don't make the same mistake.All that said, I am quite happy to finally having gotten rid of the hissing sound. The Defender seems expensive, but I am really happy I found a way to solve my problem finally! :-)

This completely eliminated the buzzing noise from my powered speakers from my PC.I have everything connected to one outlet to avoid ground loops, but I had some major buzzing noises from the speakers that matched the frequency and noise of the coil whine from the GPU. The reason the noise propagated to the speakers was because of my audio interface, which is an Audient EVO4 which is USB-powered only. So the iDefender+ bypassed the power connection from the PC which in turn removed any kind of buzzing noise. Very happy with the result, even though it's quite expensive it did the job.Keep in mind though that you absolutely do have to plug this device in on the side with separate power from a charger.

Ich bin so froh, dass es diesen USB-Stick gibt. Im Januar 2022 habe ich ihn an meinen Rechner angeschlossen und seitdem sind meine aktiven Yamaha-Lautsprecher ruhig! Herrlich! Ein Kumpel von mir hatte auch Probleme mit Brummschleifen, also habe ich ihm diesen Stick empfohlen und bei der Gelegenheit auch gleich eine Bewertung geschrieben. Der USB-Stick funktioniert zuverlässig. Ein Hinweis: Ich habe ein Steinberg UR 22 mk II Sound Interface, das mehr Strom zieht als ich dachte. Ein schwaches altes Handyladegerät hat nicht ausgereicht, aber ein Macbook-Ladegerät mit USB-C funktioniert wunderbar.