connect 2 different wire gauge to pos and neg speaker terminal

Geofkaitt, Yes, it is about 66%  = 5ns/m (I inverted it wrong).  Teflon is probably a little faster.  They also use foam Teflon to lower dielectric constant.  In addition wires can be in the hollow tubes since dielectric constant of the air is pretty much the same as vacuum (approx. 1)

Jea48, Dielectric can possibly cause distortion since it absorbs and releases energy.  Example of this is capacitor that is charged, discharged by shorting and then opened.  Voltage on the capacitor will start growing back from zero to many volts.  It is very pronounced in electrolytic capacitors.  It happens because dielectric stores and returns energy.  It is called Dielectric Absorption and is also related to Permittivity.  Returning voltage when signal has already different level can cause distortion.  Looking at the lines of audio cable I can say that price is proportional to dielectric used.  PVC, that you mentioned is pretty bad while Polypropylene is better, Teflon better yet and oversized tubes of foam Teflon are the best (Acoustic Zen Absolute IC).  How much of this is audible I don't know.  AZ Absolute sounded "cleaner" to me (more refined), but it can be placebo effect (I expected it).  Dielectric Constant also affects capacitance between wires. Capacitance of typical cable is around 25pF/ft while AZ Absolute IC is 6pF/ft.  Can capacitance of IC be a source of tiny distortion?
Al, what is your opinion on dielectric absorption in audio cables?  Can this be audible?

@kijanki,

Thank you for the response.
Jim

Thanks once more, Kijanki. Your post just above is excellent IMO, as usual.

As far as the audibility of dielectric absorption in audio cables is concerned, my reading of various technical and anecdotal references to that effect I've seen over the years suggests to me that it stands a good chance of being audibly significant in many applications. However I have never seen either an analysis or measured data that would provide a quantitative perspective on it, in the context of audio cables.

So FWIW my own "expectation bias" is in the direction of that effect being great enough in degree to be an audibly significant contributor to cable differences, in many systems. But as far as I am aware information doesn’t seem to be available that would provide insight that is more specific.

Best regards,
-- Al

Thank you Al.  I'm not sure if AZ Absolute ICs are really better in my system or just sound better because of "expectation bias"  - either way outcome is the same  :)

Al (almarg) and kijanki,

I would trust your "expectation bias" over some others so called facts any day.

Thank you both for your contributions to this audio forum. I never stop learning from what the two of you have to say. Sometimes I may not fully understand, but eventually it sinks in.

Thanks again,
Jim