David Salz is basically recommending low series resistance and low inductance in speaker cables. This is good advice.
In interconnects you would want low parallel capcitance.
The pitfall with seeking costly incremental percentage improvements in cable properties (for example copper to oxygen free or to silver wire or to special wire geometries) is that one may believe that the percentage improvement will actually translate directly into proportionally large percentage audible improvements. No so. In most cases, wires have such a small effect on the signal that with well designed and matched equipment the differences between one ordinary wire and another will be minute. For sure everything with a different equivalent R, L, and C has got to sound slightly different but the differences are so small as to be what a tin eared person would regard as negligible (no more than mere tenths of a decibel and often much less - unless you get into really strange designs that push the envelope in inductance or capcitance and resulting large phase shifts and attenuation).
Depending on which side of the fence you are on, a possible conclusion is that one might be better served by handing over more money for a better amplifier or a much better speaker (one with a bit more money in driver quality) or room acuostics than investing in incremental improvements in speaker wire.
In interconnects you would want low parallel capcitance.
The pitfall with seeking costly incremental percentage improvements in cable properties (for example copper to oxygen free or to silver wire or to special wire geometries) is that one may believe that the percentage improvement will actually translate directly into proportionally large percentage audible improvements. No so. In most cases, wires have such a small effect on the signal that with well designed and matched equipment the differences between one ordinary wire and another will be minute. For sure everything with a different equivalent R, L, and C has got to sound slightly different but the differences are so small as to be what a tin eared person would regard as negligible (no more than mere tenths of a decibel and often much less - unless you get into really strange designs that push the envelope in inductance or capcitance and resulting large phase shifts and attenuation).
Depending on which side of the fence you are on, a possible conclusion is that one might be better served by handing over more money for a better amplifier or a much better speaker (one with a bit more money in driver quality) or room acuostics than investing in incremental improvements in speaker wire.