My sources are Linn (LP12 and Unidisk 1.1). Regardless if effectively we can hear a difference between speaker cables, this difference has to be quantified and related to measurable parameters in order to become a repeatable characteristic. It might very well be that interaction between the same cable and different electronics will produce variations. Fine. We need to know why and we also need to know if more information is indeed true to the signal. That's how science works and that's offering reliable information to potential buyers. Everyone should be interested in this and just as this approach works in determining investment strategies, it also would weed out the overpriced/overclaimed ones and reward the true quality. 

Maybe you can't tell the difference with normal lengths of wire but say you took some everyday type wire and measured these values.  Then, you took a 2 foot pair and compared it to 10, 20, 50 and 100 foot pairs.  If the 2 foot pair has 20pF and the 100 foot pair has 1,000 pF then you'd better be able to hear the difference in a dbt.  If the difference is still too subtle for a dbt then anyone who claims there's a substantial difference between 92 pF and 118 pF for 10 foot pairs of the above is clearly a silly goose.  If you can hear the difference in a dbt then it would be possible to find the dbt threshold.  Maybe 35 feet is the shortest length where the differences can be scientifically proven to exist by a dbt.  That would be fantastic.  Then dbt would be a new parameter that cable manufacturers could use.  They could do measurements and advertise that their cable is scientifically determined to be distinguishable from zipcord at a length of x feet.  The lower x is the better the cable must be.  Dang!!!   I've just solved this whole problem.  Then, golden ears could claim they hear and appreciate the difference at only 40% of the scientifically determined audible difference length.