Ferrite has been used to reduce RFI in audio
applications such as interconnects and/or power cords. My listening experience
has shown that when used on interconnects it induces a tendency
to brightness which in the context of my system makes the music edgy, causing
a perceived tension. However on power cords there is an increase in low
level detail without brightness. In fact I observe a reduction in the noise
floor which gives me an impression of better dynamic range in the quieter
end of the spectrum. The effect is paradoxal in that with the additional
detail there's a smoothness and ease to the sound, it "opens", not
dissimilar to the effect of replacing inferior caps with good film ones.
This tweak effect is apparent not only on my reference system but also
on our TV, kitchen table radio, even the clock radios. Some tips when trying
these: use them closest to the electronics (away from the power outlet),
the tighter around the cord the better (even looping or bending it to have
two passes if it fits), the effect is increased with additional ferrite
clamps added, TV picture improves also with use. These are my observations,
your mileage may vary. They easily clamp around the cords.
Measurements are in inches.
| Core Diameter | Case Width | Case Height | Case Length | Price Each |
| .465 | 1.23 | 1.07 | .93 | $2.50 Round |
| .275 | .825 | .75 | 1.272 | $2.00 Square |
| .402 | .920 | .878 | 1.295 | $2.50 Square |
| .528 | 1.27 | 1.20 | 1.295 | $3.50 Square |
| .32 | .835 | .785 | .775 | $2.00 Round |
| .500 (TDK) | 1.165 | 1.175 | 1.54 | $5.00 Round |