1) What exactly is ‘in’ these is hard for me to determine. Bybee aren’t too specific in their descriptions but I don’t think copper tape wrapped lump of ferrite is just what’s on offer here. And yes, we’re told continually that adding to the chain must lead to deterioration but in my experience it’s never been that simple.

2) I agree that a decent blind test would be very welcome — I just am not able to run a good one easily in my home (and I know how to run human tests). I certainly did not hear differences in every situation, as I explained, so skepticism until you hear for yourself is warranted. I am keeping these around to explore further. The terms Bybee offer to buyers suggests to me that if any of you want to do some testing, or even some listening on your own, it would not cost you more than time and effort to try. Do it, and let us know.

Thanks for the comments – it’s a wonderful audio world!

Time and time again reviewers claim these sorts of things not only improve the sound but do so obviously in an instantly and easily recognisable manner. Surely you can understand us sceptics scepticism when this is the story time and time again without fail. I’m willing to put aside my scepticism but no one seems to be to do the most simple of tests; one which by their own admission should be a walk in the park as the changes and improvements in sound (decay, focus, top-end clarity etc) are so noticeable.