Frequencies addresses by power cords?

I don't think that any generally applicable conclusions can be drawn about power regenerators. From both a technical and an anecdotal standpoint their efficacy figures to be dependent upon their own design, the designs of the components they are powering, and the characteristics of the incoming AC.

Obviously regenerated AC that is essentially free of both noise and distortion figures to either be helpful or to not make a perceptible difference, depending unpredictably on the designs of the particular components and on the characteristics of the incoming AC. But whatever limitations a particular regenerator may have in terms of its responsiveness to abrupt changes in demand for current may or may not outweigh that benefit, depending on the designs of the components and the regenerator. And adding to all of that uncertainty is the possibility that the potential downsides of either using a regenerator or not using a regenerator, if present to some degree, may be subjectively preferable to some listeners with some systems.

So it's all essentially unpredictable as I see it.

Regards,
-- Al

Safe comment - unpredictable :-).

MIT and Transparent both use "Interface Boxes" which are nothing but "glorified" low pass filters that filter most signals above 20KHz.

Thanks Don, more detail would be helpful. I'm most interested in MIT, Shunyata & Equitech. (These mfg's don't provide detailed specs; although I can't imagine why. If they are proud to build it--they should be proud of what it does.(High-end has had enough "magic" & "flooey dust"-not to mention "magic anti resonance dots-wow, that's a great one) over the years and I am certainly hoping our tech advances will soon make "magic" a thing of the past.) I want to create the most effective "blend" of conditioners and power cords. Of course I'm doing well by ear, thanks to Ref Spectral & MIT gear-and an Equitech 2Q providing a basic isolation/cleaning of AC, creating adaquate depth of detail and clarity to analyze the sound I have, but in classical music I enjoy how more details bring me closer the the artistic creativity of the composer, the director and the individual genius of the players, not to mention the ambiance and silences.