Tgrisham, thanks very much for the nice words.Here
is a link to the Stereophile measurements on the Maggie that Onemug referred to.
Data for 16 gauge wire can be obtained from this wire gauge table
. Plugging the 1.29 mm conductor diameter that it indicates into this calculator
yields an inductance of 5.95 uH (microHenries) for the 16 foot round-trip that the signal has to make, based on the worst case assumption that the two conductors are widely spaced.
Based on the formula for inductive reactance (the inductive form of impedance), 2 x pi x f x L, where f is frequency in Hertz and L is inductance in Henries, 5.95 uH corresponds to an inductive reactance of 0.75 ohms at the worst case frequency (20kHz). That verges on being negligible in relation to 4 ohms, taking into account that the phase angles of that reactance and the speaker's impedance differ considerably. (If the angles were identical, the resulting loss at 20kHz would correspond to 4/(4 + 0.75) = -1.5db).
Alternatively, this calculator
, which was called to my attention by Shadorne in a thread a while back, can be used. For wide spacing of the conductors, it indicates a loss of about 0.1db at 20kHz into an 8 ohm resistive load (and less than that in relation to the slight loss that occurs at low frequencies, due to resistance). That would approximately double into 4 ohms, and increase a little more due to the somewhat inductive impedance characteristic of the speaker at high frequencies.
As that calculator makes clear, the loss numbers would diminish to complete insignificance if the wires were twisted, especially given that the thin insulation makes it possible for the conductors to be in close proximity.
So the bottom line for the 8 foot run length and the particular speakers appears to be, to the extent that cable effects are explainable by generally recognized science, that it probably won't make much difference either way, but twisting can't hurt (assuming you have confidence in the integrity of the insulation, so that shorts won't occur) and may help slightly. That may also be true for the reason Hifihvn cited, if either of the amplifiers are sensitive to rfi that may be presented to their output terminals.
Was wondering if the thicker wire would help the Cary out in the damping dept?
I doubt it. The 16 foot round-trip length of 16 gauge wire corresponds to a resistance of 0.064 ohms, based on the wire gauge table I linked to above. Paralleling two conductors for each leg would halve that to 0.032 ohms. Adding either number to the 1.5 ohm amplifier output impedance would not change the damping factor significantly.