My humble opinion is:
Any benefit or detriment of bi-wiring must be dependent upon impedance of the wire itself, and even then, would be overwhelmingly resistive in nature, with little or no measureable reactance, even skin effect.
That has to be the difference between bi-wiring and merely parallelling the same two lengths of wire. I do have trouble believing that the supposed
disadvantage of bi-wiring really matters.
Having said all that, when I made my in-wall stack and ran new speaker wires (and sub line-level interconnects) in the wall, I bi-wired for a few reasons:
1) I had a spool of 14 gauge handy, and felt that, for my power levels and wire lengths, a heavier gauge would be desirable. I could have merely parallelled, I suppose, but.....
2) My amps have two sets of terminals (with a slight difference) on most channels, Bob suggests trying it, and my speakers have two (three-actually) sets of terminals, plus.....
3) I could, and there was no good reason not to.
The most audible difference I made was using full-range pre-amp outputs (which the speaker maker suggests) instead of LFE outputs to drive the sub amps.
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Larry Fine
www.fineelectricco.com My system