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38.116.2.4
In Reply to: I ran into the SAME thing last night.... posted by mattcecil1@yahoo.com on April 3, 2007 at 10:53:49:
Hukk
Follow Ups:
it stands for carbon fibre, sorry! there's a post just a few inches down from here where someone suggested this.i don't think raw CF is very expensive. If you find a source & want to try this, i'll split some with you.
from what i've read heree & elsewhere CF is supposed to do well to reduce or absorb or remove EMI/RFI...even a few outlet covers are being made of it in the aftermarket: oyaide & Furu.
CF aside, what about ferrite rings or something else more traditional??
Audible hum is not caused by RF resonances, so don't install carbon fiber to cure hum.Carbon fiber sleeve material is sold for people who make their own golf club shafts and the like by Soller Composites at very reasonable prices. Look for the carbon fiber, not similar sleeving made of Kevlar or Fiberglas. Carbon fiber is a resistive material that dissipates the energy in standing RF waves on cables.
Ferrite sleeves, clamps, rings, etc. typically have their own sonic behaviors that make them worse than the RF noise.
RF noise causes resonances on most audio cables. These resonances are strong tones at particular frequencies that mix with the audio signal and produce spurious overtones. The artifacts are typically perceived as a brightness or harshness, but affect all audio frequencies. Reducing the RF resonances should clean up the treble, make the midrange warmer, and the bass more palpable.
Hukk
It might help, but is not going to attenuate the magnetic component of the local radio waves. These will pass through and induce voltages in your cables and equipment.The engineers at the radio station causing the problem might have some ideas. Shielding your room could get quite expensive. If you can narrow down the cables or components that are most sensitive, perhaps shielding these would give relief.
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