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

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.

best product ive bought this year. and cheap.... fixed everything i had issues with my douk audio (and sub aux out too.)zero noise. sound quality hasnt been altered, and without hiss and buzz, its pristine.so stoked

Instantly removed the annoying buzzing noise from my car audio system. Super easy to use—just plug it in and the sound is clean. Great for both car and home stereo setups. Highly recommend if you're dealing with ground loop noise! 😍😍😍

Did an exellent job with the humm and other intefering noises. I had a totally different situation than the most common use to an output to an stereo speakers. So you just have to try it.I was linking two radios for special emergency communication. This noise filter did the job.I was not concerned loosing any of the other frequencies. However, in my special situation it worked great.One of my laptops was generating a loud humming noise onto another. audio device, probably coming from the cooling fan. After I connected this filter, the humm was gone.It took it out instantly. The adapter took a little longer to arrive. Reason for the 4 stars.

This isolator immediately killed the right side of my audio. I’m trying to install surround sound and remove the buzzing. While it did eliminate the ground loop buzzing, it completely ruined my stereo signal. Only the left side speakers and center worked — the right side was completely silent. The connectivity from the cables were also really poor.I tested it with multiple cables and devices, and the issue always came back to this isolator. It’s poorly made and clearly not balanced for proper stereo output.If you’re running a proper setup and care about sound quality, avoid this.

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.

Though I had to buy the expensive ones, BUT NO.. This one does the job... Using a TV as a second monitor OFF a Surface Laptop. Ass soon as i plug the HDMI, noise came in, and then digital clipping constantly. THIS LITTLE GUY GOT RID OF ALL OF IT..

It works I suppose. I didn't have a lot of noise. It was only noticeable when I had the volume turned up and nothing playing. This cut the noise down pretty well but it also killed all bass and turned it into a muddy mess. I never REALLY understood the phrase "muddy bass" until this thing. It legitimately makes it sound like I'm listening to a speaker that is face down in mud.Unless your static is REALLY bad I wouldn't bother with this thing. Ruins the quality too much to be worth it. I'd rather keep turning my volume back down when nothing is playing.