Tweaker's Asylum

Copper Pipes?

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Ben Hammer

I'm not sure about this, but that's why I'm here. So here it goes.
Copper blocks EMF's thats why some components have copper(plated)chassis, correct? So if you ran your power cables through a copper pipe behind your components would it be noticable?
Ben Hammer

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Re: Copper Pipes? Steve Eddy 21:14:51 01/26/00 (2)
Ben Hammer wrote:
"I'm not sure about this, but that's why I'm here. So here it goes.
Copper blocks EMF's thats why some components have copper(plated)chassis, correct? So if you ran your power cables through a copper pipe behind your components would it be noticable?"
If my "EMF's" you mean the electromagnetic field produced by your power cables, then copper won't help you much in terms of shielding. The electromagnetic field produced by the power cables is H-field (magnetic field) dominant and to shield that, you need some sort of high-permeability material (like muMetal) that can absorb it. Copper is used for RFI, which is largely E-field (electric field) dominant and works largely via reflection (due to the impedance mismatch between the electric field and the copper)rather than absorption.
se
- Re: Copper Pipes? Paul Kelly 16:16:35 01/27/00 (1)
  Copper shields on components will block a maximum of about 30% of area RFI, which should produce a noticeable improvement in sonics - noticeable in my system as an increase in detail and definition - but will do little for EMI (electromagnetic interference). If you want to 'block it all' try using shields made of 'T.I. Shield' material (available from Percy).
  I have become a Fanatic Shielder since I discovered the outrageous amount of RFI that is being generated INSIDE audio equipment enclosures (take a pocket A.M. radio tuned between stations and hold it near a piece of your equipment with the cover removed that is turned on - it will be howling like a Banshee ! Then pass a signal thru the unit and the noise level will at least double). This type of interference is generally the masking type : you don't hear it per se, but really notice its' absence in the form of additional resolution etc. i.e. you hear things that weren't audible previously in familiar music.
  - thanks for the clarification (n/t) Ben Hammer 16:50:19 01/27/00 (0)
    n/t

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