In Steve's system thread, he posted the following information:
I discussed this with Leif and he states that the Master Built engineers voice the cable for 3 things 1. Low reactance 2. Low capacitance 3. they must be neutral. IOW signal coming out is identical to that going in
[/I]Does #2 tell you anything about inductance?
Generally lower capacitance implies higher inductance but it depends upon the cable topology and target impedance. "Low reactance" implies low capacitance and low inductance. The characteristic impedance is related to sqrt(L/C). Small L and small C are hard to get simultaneously and that may be their "secret sauce". A thick dielectric (insulator between center conductor and outer shield) reduces capacitance, as does a low dielectric constant (could be air*), but that increases inductance. A very thick center conductor with thin dielectric yields a cable with low inductance but high capacitance. Their special material might allow them to better optimize both reactances at once, I do not know. Or perhaps they reduced capacitance at the cost of increased inductance; that would explain some of the HF filter effect people seem to be reporting (my interpretation).
* A number of microwave and above cables use air as the dielectric, with just internal "wafers" or discs to keep the center conductor in place, and similar construction with nitrogen inside the cable is used for some high-power transmission lines. Waveguides are used for mmW and above (30 - 300 GHz).