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In Reply to: RE: Found the missing Ferrite bead: I can replicate your listening experience ! posted by hfavandepas on May 30, 2011 at 11:21:43
Please try to remove the ferrite bead after a couple of weeks.
And see if you get the same improvement again.
Ferrites lose their effect when DC goes through them.
Actually, Charles Hansen (of Ayre Acoustics) claims that an extended period of DC creates a deleterious effect, with demagnetization needed.
Follow Ups:
Hi Bibo01,
It just sprang to mind that Charles Hansen might be pointing at saturation of the ferrite by a large DC magnetizing force. As described on page 109 and 110 in the article from ferrite manufacturer ‘Steward’ (see link below)
According the article this can be prevented by always feeding only a pair (or group) of wires through the same ferrite bread, that carry equal and opposite direct currents. This too ensure that there are always equal but opposite DC currents, which will result in a zero net magnetic flux density, this way preventing saturation of the ferrite.
It is good that you brought this too attention.
The P24 supply cable on which I also want too try the ferrite breads, consists of eight black ground wires, five red 5 Volt wires, 4 orange 3,3 Volt wires and two yellow 12 Volt wires.
In a cMP setup these wires carry approximately:
- 3,5 amp on the five 5 volt red wires,
- 0,3 amp on the four orange 3,3 Volt wires
- 0,12 amp on the two 12 Volt wires.
So careful cable-dressing amongst the black and the colored wires might be necessary, so too try too distribute all opposite fluxes evenly throughout the inside of that cable bundle.
May be it might also be a good thing, once that cable is dressed up, too twist that dressed up cable bundle a few times, so to make all wires in that cable bundle too come too the surface over some distance, in order too bring all wires close too the ferrite for some length inside the ferrite bread.
Anyway, thank you for pointing on the possible saturation of the ferrite bread. As I think this is what Charles Hansen probably ment.
Mark
fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
Hi Bibo01,
Thank you for the tip.
Not because of that I think that ‘ferrites lose their effect when DC goes through them’ but because I find your tip very useful for testing the ‘placebo’ effect. Every tweaker is always at high risk to be fooled by the ‘placebo’ effect.
I never red or heard anything about such fenomenon untill now. Ofcourse that doesn’t mean that Charles Hansen claim is not correct. I try and see what comes up through the net after some google-ing. But if I can not find any serieues articles on that effect, than I will consider it not too be true.
Mark
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