Whilst bi-amping could conceivably make a difference - whether or not it's worth the expense is another matter, but bi-wiring will only make it difference if the known laws of physics are wrong - and I don't know of any hi-fi engineers getting invitations to Stokholm for their prizes. To be fair, hi fi ENGINEERS will know it's bunk. To be even more fair, if your cable is a bit on the thin side, then doubling up may help, but that's a slightly different question.
As some context, I did used to be a bit of a hi-fi geek, though avoided the extremes and though a bit of a linn-o-phile in my day am now all digital. There are some bargains on fleabay though, now being the proud owner of some £3k kefs bought for £500 - wow, they're good !