The general power/impedance analyses, to which you refer, correctly indicate that most of what you describe is simply overkill.
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In theory very low frequencies will use more of the 'center' of the wire because as the frequency increases it only uses a few microns of the outer surface of the conductor. That's also a reason why a lot of cable manufacturers just plate a copper base. Also as the gauge gets larger there is more surface area for the electrons to flow.
I remember the first time I tried Audience AU24 speaker cables in my system- I was using Revel speakers at the time.
I was stunned at the bass response and definition, combined with a fantastic top end, all communicated via a truly diminutive speaker cable.
Sold my giant Harmonic Tech Pro 9 and never looked back. Clearly, it ain't all about the gauge :)
Thanks all. I have always wanted to try the AU24, but haven't yet. I have enjoyed the AZ and HT cables that are both made from individually insulated PCOCC solid core copper wire (although I believe the AZ may have a small percentage stranded wire component).
These new cables I am putting together use stranded PCOCC wire that has been cryogenically and magnetically treated. I will try them in a straight double run bi-wire configuration so the LF and MF/HF each get the same sized cable using 13awg wire to each of the four bi-wire posts per speaker. I will be making runs of only 4 feet in length, so most of the articles I have read indicate that the 13awg should be more than sufficient for my 300wpc into 4ohms. However, the Tempo Electric article indicates a gauge of 10awg sized wire should be used for runs of "less than 8 feet" and amplifier output of "over 200wpc."