20Pcs Clip-on Ferrite Ring Core Ferrite Bead RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter Cable, Black

I put one of these on every DC power lead and on the coax leads. Noise can be cumulative, so these can help reduce noise little bit by little bit amounting to much better performance.

So good I ordered another set! These solve a lot of RFI problems!

Bought these to suppress high frequency interference in an electrical system but for my particular issue they did not help so I cannot comment much, a few of the magnets were damaged from apparent rough handling

I had recorded a 45 minute podcast on my Zoom H6 recorder at a new location, brought the SD cards into my office, started listening to the audio, and heard something horrifying. I could hear a radio station in the background. It was subtle, but noticeable. It had ruined the entire interview. There is a massive radio tower nearby and the interference was being picked up on my recorder. After some research, I ordered a set of these, put them on the XLR cables near where they plug into the Zoom H6, and the problem was solved. I love recording at this location, and without these on my XLR cables I would never be able to. This was money well spent!

I've been using these ferrite beads for coax cable for amatuer radio applications. The are working great as an RF choke. The quantity for the price is great and the various sizes have been useful for different projects. The noise reduction on my HF radio is significant. They quickly and easily snap onto the cable and lock into place. They can also be removed easily if need be. Very well made and recommended.