Ferrite Cores for Power cords

These devices act as a choke (filter out higher frequencies that may be picked up as a cable acts like an antenna).

Generally these should not be required on a power cord or speaker cable as impedances are very low (unless you have a radio operator next door with a big antenna radiating you). The most useful application will be on video monitors or data cables that operate at high frequency with low signal levels and high impedances.

wilfredt, after reading this last night I played around with some of the ferrites I own. I tried 3 in the basement on my 20 amp circuit that powers my system. This was a nice improvement. More natural and smoother.

I also tried 3 on my virtual dynamics cable for cdp. One clamped on all 3 cables of the virtual power cord. This was another nice improvement. same as noted above.

I actually orded 60 of these on ebay and they seem to have the nicest prices. I bought some larger 11mm openings and larger ferrite to get more of the larger cables.

nice and worth the little expense considering how much these places sell their tweaks for.

Dear all, thanks a lot for sharing your experiences. I conclude it is definitely worth a try placing at different places mainly close to the CD player, especially considering the low prices involved. I shall buy some from the online sources you mentioned to play around with them.

Freemand, I could only locate one Hong Kong based source in ebay - did you buy from the same source or was there another one too.

Willfredt,

I bought mine from Rogerdeane on ebay. I bought a ton. Actually all he had, but I am sure he will put more up. He was great...bought wednesday and recieved friday.

I have 60 of these things and will put them on everything in my house thats plugged in including every circuit that leads into my breaker box. Putting then on my systems 20 amp circuit proved to lower the noise.

the ones I bought have a nice 11 mm opening.

There are a lot of things I would like to do with the incoming power but that will have to wait. Two very young kids will put a stop to most anything that requires a lot of time on a project. I would like to try better sheilded romex on my dedicated lines eventually and I know some who have done this with good results.
Two days ago I put some ferrite clamps on my Reality cable ic's from the cdp to pre. Two clamps coming out and one clamp going in. They are not coming off of these ic's and I did not think to try them again until reading this post. These ic's are fairly new in my system and they do not have a lot of insulation/shielding around them. The high frequency did not roll off and the mid range became more coherent. Less noise less grain. One thing I did notice is that the ferrite has to fit fairly tight over the cable. These probably won't work on all ic's but the ones that do not have a lot of insulation or shielding may benefit with ferrite clamps. It Would have been interesting to put these around the Anti Cable ic's I was using at one time. Audio Metallurgy GA-0's use a magnet all the way down the middle of this ic and that seemed to roll the highs off for me too much. They are real good for a bright system. Still acts as a ferrite however.