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magnet on cables
Old 10th February 2009
  #1
Here for the gear
 
ILPro's Avatar
 
🎧 10 years
magnet on cables

Hi! I was always wondering why there is a magnet on some audio and other cables? Like there is on my Sony Vaio Desktop speakers?!
Old 10th February 2009
  #2
Gear Guru
 
tINY's Avatar
 
1 Review written
🎧 15 years


It's not a magnet. It's a ferrite ring to raise the inductance.

This stops high frequencies from getting into or out of the box by riding the cable.




-tINY

Old 10th February 2009 | Show parent
  #3
Lives for gear
 
Alex Specht's Avatar
 
🎧 10 years
Quote:
Originally Posted by tINY ➑️

It's not a magnet. It's a ferrite ring to raise the inductance.

This stops high frequencies from getting into or out of the box by riding the cable.


-tINY
Another Gearslutz mystery uncovered.

tINY you are my inspiration
Old 10th February 2009 | Show parent
  #4
Lives for gear
 
🎧 10 years
But only for common mode signals, right?


/Peter
Old 11th February 2009 | Show parent
  #5
Here for the gear
 
ILPro's Avatar
 
🎧 10 years
Quote:
Originally Posted by tINY ➑️

It's not a magnet. It's a ferrite ring to raise the inductance.

This stops high frequencies from getting into or out of the box by riding the cable.




-tINY
Thanks!

I wasn't checking if it's a magnet it just looks like it!
And is there a point of using it on the studio monitor's cable? Or it's a silly question?
Old 11th February 2009 | Show parent
  #6
Gear Nut
 
Bobbaganouche's Avatar
 
🎧 10 years
here is something to bring up your dinner...

Jodavi

Old 11th February 2009 | Show parent
  #7
Lives for gear
 
🎧 15 years
Another way of looking at it is that magnetic fields vastly prefer to travel through ferrous material than they to travel through air. Like about 2000 times more so from memory. So by fitting these ferrite beads around the ends of cables, they encourage any stray magnetic fields to concentrate in them, and not the cable.

You often see them around video cables, and powersupplies for computers and cameras and sensitive digital stuff. Noise is annoying enough for audio, but for video it creates white specks that consumers tend to be annoyed about than they are about noisy audio - go figure.

You can buy a bag of these things and clamp them around guitar cables and wall warts & line lumps, digital cables - whatever takes your fancy.
Old 11th February 2009 | Show parent
  #8
Gear Guru
 
tINY's Avatar
 
1 Review written
🎧 15 years


Usually they are added to comply with FCC emission regulations. It's cheaper to add a bead to a cable than to spend months trying to redesign the digital parts to keep noise from getting on your grounds and coupling to the cables.



-tINY

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