if two-post speaker has parallel crossover than it can be modified for bi-wired one otherwise it cannot. bi-wired speaker basically setup to use a reactance value ranges of wires that are going from amplifier and has a parallel crossover thus using this reactance to match-up the best crossover point. wires due to their reactive nature to the AC signals do have reactance that in some scale impacts crossover point on any of the speaker crossovers.
I agree with Sugarbrie. To make your speaker "bi-wirable" would require changing the cross-over assembly, therefore changing the characteristics of the loudspeakers in question which is not, at all, worth the effort.
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