Rob - I knew Tantalums from Bryston's 1980s designs, and checked them out. Not as good as our stock caps. Bryston abandoned them also.
Taking the woofer XO closer to the midrange driver would not be good.Some models would benefit from moving the XO to the cabinet floor, but the bottom is glued in. I've been running around this bush quite a bit. I will say that outboarding the crossover is having wonderful results. In addition to the gain in distance from drivers, add absence of vibration and freedom to mount components in free air, and lower ambient temperature for XO and for drivers, since the XO itself generates heat.
Taking the woofer XO closer to the midrange driver would not be good.Some models would benefit from moving the XO to the cabinet floor, but the bottom is glued in. I've been running around this bush quite a bit. I will say that outboarding the crossover is having wonderful results. In addition to the gain in distance from drivers, add absence of vibration and freedom to mount components in free air, and lower ambient temperature for XO and for drivers, since the XO itself generates heat.