Wilfredt - I did not do extensive a/b testing with various types or brands. I read a couple of articles on line. Parts Express had a factory close out sale on Ferrites. 79 cent each for >10. I put them on everything. It seemed like a potential inexpensive, low risk tweak. In general, I put them at the end of the cord or cable closest to the device being powered or driven. (if the length of wire acts as an antenna - it seems to make sense to block the interference just before the "corrupted signal" enters a device; placement upstream did not seem like an effective way to block RF picked up downstream). I thought I heard an improvement in sound quality. Quieter and slightly more detail. It is subtle and I can't swear I'd detect a difference in a "blind test". Eventually, I might remove them and see if things sound worse. Might be worth an experiment for you as well. I will be very interested to follow any other responses you receive.
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