I think some more high-end speaker cables ought to be reviewed. I want to see a review of a cable that intentionally introduces inductance, capacitance or even an R-C, R-L or combination filter. There are these speaker "cables" that have these podular swollen sections, like some kind of awful tumors- or the kind with cast-epoxy bricks. These things likely have some kind of filter in there, and, sure - those ARE likely to sound different. I'd like to see the FR plots of that kind of "cable" and other tests like S/N might show differences over Amirm's AWG 16 cobbles - er, I mean CABLES. I'd also like to see some tests of some odd "cable topologies" like the long flat ribbon kind, I think conductors of this configuration will introduce some L or C compared to a regular wire, which will alter the frequency response.
And, as far as the idea that because stranded wire has the various strands touching in multiple places which could alter the path that currents flow through the wire- there's evidence of significant ignorance of physics in this notion, I'd like to point out a few of my favorites.
1. Audio is alternating current electricity. In A.C., there is no net flow of electrons through the wire. So how could "the sounds" be out of phase from travelling along slightly different paths in a stranded wire? NOTHING is travelling through the wire, but a signal is PROPAGATING along the wire. The electric and magnetic fields will maintain coherence regardless of the touching of strands. The AC signal doesn't somehow "break apart" with different parts flowing along different strands. (If you think it does, then please send me some of whatever you are smoking. It must be righteous stuff, irie!)
2. A.C. will propagate along a conductor at roughly 90% of the speed of light. Changing the "path" of some part of the signal (if such a ridiculous thing could happen!) would have to amount to a rather high value to somehow audibly shift the phase of components of the AC signal. The AC signal will propagate along a 3 meter cable in 6.00 × 10^ (-6) secs. So, let's say that the worst-case "delay" along the wire is 10 times the normal propagation time due to the signal following some circuitous path along thousands of the small strands. So that would mean a delay of ~5.4 × 10^ (-5) secs. That corresponds to a phase shift of less than 1° at 5 kHz, and correspondingly less at lower frequencies. From all the research I've been able to find, this is far, far below the human ear's sensitivity to phase shifts. Well, this "phase shift from stranded wire" doesn't happen, and even if it did happen the way Morrow claimed it happens, you wouldn't be able to hear it.
And skin effect? Skin effect in solid conductor wires at 20 kHz doesn't become a significant factor in signal propagation until the "wire" is about 1 cm diameter. And for stranded wire, skin effect is negligible up to several megahertz, but of course other issues like radiation loss, standing wave problems and so on cause more significant issues in an ordinary wire than skin effect above a few hundred kHz. Skin effect is important in radio frequency transmission lines, but not in speaker cables.