What causes phase shifts...Sean?

Boy, thanks for all the information. I am particularly interested in the acoustical aspect. I found it very interesting that a Marigo dot treatment on the windows in my listening room really improved the focus. Now I am trying to get a handle on why this worked out this way. Anyway, thanks for the resources. If I find anything interesting I will report back.

Sean- Since phase shift (time delay) plays havoc with the harmonics of a fundamental note, a better question might be, what does NOT cause shift. Answer- Speakers with first order crossovers (e.g., Vandersteen, Thiel, Meadowlark...) and DSD (SACD) coding / encoding. That's all you need to know IMHO.

...or speakers with NO crossovers, like dipoles, but being dipoles alas, they open up another can of worms....

Thanks again, (not-so)Clueless...and you too, Aball.

Can of worms? Ok: Why would anyone put magnets or ferrous (magnetic) material in a power cord? Bob Crump got me to thinking about how ridiculous such construction is, so I wonder what what proposed inductive manipulation is at work here, and why on earth would anyone consider it beneficial?
Ah...I see them wriggling already! Cheers.