Smof Upgraded Ground Loop Noise Isolator, Noise Filter for Car Audio/Home Stereo System (Eliminate The Buzzing Noise Completely) with 3.5mm Audio Cable, Black

I've been using this for almost three years, and it hasn't let me down yet. It gets rid of buzzing, and does it reliably. Add in its cheap price, and I am fully satisfied.

I was getting a constant buzzing noise in my speakers whenever my PC and audio equipment were connected. Plugged this little ground loop isolator in, and the noise disappeared immediately. Super easy to use—just plug and play. It’s compact, does exactly what it’s supposed to, and saved me a ton of frustration. Highly recommend if you’re dealing with annoying hum or interference in your audio setup.

tl;dr: it works, and cleared up the signal for those mobile/portable airplay car stereos so much that the sound is clearer that connecting directly to the car stereo via USB aux. Didn't expect it, give it a try if you really wanted your stereo to work but the bad background interference and noises made have you ready to send it back.I don't want to shell out money for a real stereo system yet so I bought a mobile stereo device. The stereo was good but had really bad interference and noises with when connecting to my stereo via 3.5mm aux. I prefer connecting to my stereo with either 3.5 or usb aux because the sound quality is much better than a regular bluetooth connection (at least for my car). That noise had me ready to return the stereo which was a bummer because it did carplay and stuff really well at a super cheap price so I decided to give this ground loop a try as I read one person saying it helped for them and I thought it was worth a shot. It totally works, against all my expectations this thing not only made the aux totally clear for the portable car stereo, but when comparing it to my preferred usb connection quality I found that it the USB actually had more background noise. Somehow, connecting my iphone to the stereo via bluetooth, with this thing connecting the car aux, it sounds better than my phone's direct usb aux connection.I tested it by playing back the same sections of a song on both USB directly from my phone to my car stereo and with this filter between the aux of the portable stereo into the car 3.5mm aux connections multiple times, and also when the song was paused turning the volume up all the way to listen for any background/interference sounds. The interference totally disappeared from mobile stereo into the aux and I then realized that my previously preferred usb connection had a ton of noise in the background because of the comparison.Hope this helps, this thing totally cleared up a horrible signal.

I bought two of these units to put in line between two audio sources feeding a Y-cable to my headphones. Previously, there was some very annoying and erratic static. It was completely eliminated by these devices. I'll give it a fifth star after I have it in use for a while.

The audio still sounds the same.

super producto, elimino los armonicos y ruidos molesto de mi sistema de audio del carro

I wish I would’ve known of this product earlier. The countless calls I had to hang up on because of the background noice. Now my music and calls on CarPlay are crystal clear.

I had to rewrite this review as I did some further diagnostics to find it was not my pc that was causing the noise it is from another part in the setup I am utilizing. I cannot confirm at this time exactly if this product works as designed however I am still concerned that my system did not get any audio at all after plugging in the isolator and the 3.5mm into the isolator. I even tried flipping the device so that the 3.5mm cables plugged into the opposite sides to no success. this device may be best if you are using a phone or another system maybe microphones even.