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In Reply to: Are ferrite rings bad for power cords? posted by robertopisa on April 19, 2007 at 21:12:50:
I own two of the newer Audioquest power cords that come with two removable ferrite stoppers on each cord.With them on the sound quailty was limited and congested.Once I removed them sound stage came back to life with more detail so yes in my opinion ferrite stoppers do effect the sound for the worst at least from my perspective.Don't ask me how because I don't have an answer.
Ferrites such as the Audioquest ones do not have any effect at audio frequencies. They are only resistive in the MHz range.
The ill effects you attributed to the AQ supplied stoppers were "something else".
It is impossible for the AQ stoppers to create the sound qualities you described.
Anything with high magnetic permeability will interact with the audio-band magnetic fields. Unless the cable is perfectly coaxial, there will be some audio-band magnetic field outside the cable, where the ferrite device can interact with it. It remains to be demonstrated that the ferrite material is perfectly linear in the audio band before we should believe the assertion that it cannot affect the audio signal.
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