uxcell 7-9mm Ferrite Cores Ring Clip-On RFI EMI Noise Suppression Filter Cable Clip, Black 10pcs

Great quality and works well for DC application. No way to tell what type of ferrite material they are using but it seems to be a 43 or maybe 31 NiZn. Works as well, or better, than some professional chokes I had on hand. One was enough between a 7V DC linear power supply and ethernet device in a stereo streaming setup. Tightened up the bass a bit. Two made the sound a little congested. Many folks would question the efficacy of a device like this making an impact on sound, but I can hear a difference i my system. Don’t know how well they work for more overt noise problems, but they are cheap, and easily added and removed.

I have some wall mounted speakers connected via unshielded cabling run through the wall. Replacing the cable wasn’t really feasible so I bought these hoping it might help.I was pleasantly surprised that these effectively eliminated all the hum and saved my speaker setup!This isn’t going to solve all problems with perceived hum, but in my case it was exactly what I needed to effectively shield my speakers from the electromagnetic interference from adjacent electrical cabling.

I tried these on cat5e cables, and just a bit too small. The little prongs that stick out the ferrites appear to be the problem. I think the round part diameter is sufficient. These are supposed to be 5mm and I had measured my ethernet cable diameter at about 4.7mm, so they should have fit.These are small measurement amounts, so I'm hesitant to fault the product too much...otherwise they seem fine and I'll keep them around for smaller cables that might need them.

Easy to install

Did not work for me.

Does a decent job of noise suppression and if one doesn't do it a one or two more.

Easy to use Works nice

Looks good