I was browsing Audioholic's cable forum, and I ran cross this post from you:

http://www.audioholics.com/cgi-bin/i...=ST;f=4;t=1474

You said in your post:"Coupla decades ago, Bell labs found that the wire inductance in conjunction with the insulation's frequency varying dielectric constant, caused a varying propagation speed through the audio band, making for distortion..they figured it out, and came up with equations to relate it all."

Could you expand on your comment regarding this issue. I didn't know Dielectric constant (absorbtivity) varied with frequency.

For example, Air is a dielectric which have dielectric constant of 1. If the dielectric constant will vary with frequency- then how can you explain white light which is a composite of a number of "different" frequencies all traveling at the same speed thru the air?

Also how would variability of Dielectric Constant effect cable impedance (like Coax) over a wide range of frequency(s)?