Only if you use an electronic x-over and bypass the woofer x-over. Simply using a separate wire to the woofer input does nothing because the woofer x-over is still in use. This passive woofer x-over usually has an inductor which compromises amplifier damping. Eliminating the woofer inductor has the benefit of better amplifier control of bass frequencies. And for that an electronic x-over is necessary.
Yes, just use one set of cables per speaker and a jumper between the positive pair and between the negative pair terminals. No need for a more expensive bi-wire cable.
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