While bi- or tri- amplification will bring some benefits, I find virtually no benefit to bi- wiring – unless I was making a profit selling cable. If I was given a choice, for a given distance between amp and loudspeaker, of bi- wiring two cables, one for mid/high frequencies and one for low frequencies, giving a round trip resistance of two ohms each, versus one cable that gives a round trip resistance of half an ohm for all frequencies, I would choose the lowest resistance option. Remember, whether bi- wiring or not, the same passive crossover elements are still in the path and still interacting electrically.