RCA Noise Isolator Hum Eliminator Ground Loop Noise Isolator(No Reduce Bass) ABS Shell Quality Noise Filter Isolator for HIFI Stereo Home Theater Car Audio Player Plug&Play(Black)

It is exactly what I needed to do the job

So far so good. Works for what I need at the moment. Ground loop issues between audio mixer and USB computer connection.

I had a small computer that I was using as a media center in my RV. The audio out of the computer fed the aux in of the existing radio/CD/DVD player unit. I used a voltage stabilizer to keep the variable 11-15V from the coach battery system stable at 12.5 V for the computer's power input. The setup worked, but there was always the buzzing, and squealing noises in the background of the audio. Some of the noise may be from the voltage stabilizer and some from the computer. It did make different sounds when accessing files. This isolation unit fixed the problem nicely. The audio is now noise free, even during silent parts with the level turned up. It did roll off the low frequencies some from the direct hookup, but it was easily fixed by upping the Bass in the radio unit's audio menu.This would be helpful anyplace you have an audio source that is separate form the audio amplifier and speaker system. For AC powered systems, it would help eliminate hum.

Made zero difference in hum. Useless for my application.

Took care of ground loop noise I was having!