Best speaker crossover caps for deep, tight, detailed and tactfull bass?

when replacing shunt caps maintain the total R+ESR values, especially in caps that go to ground.

Electrolytic capacitor ESR increases over time with use, best to replace it with film capacitor. Since shunt caps are connect to ground, no need go crazy with expensive exotic caps.

To answer your question, a schematic will be helpful.

Audio grade film capacitors.

internal cabinet design ,damping material also contributes to deep, tight, detailed and tactfull bass

I find Audio Note Kaisei non-polar electrolytic caps work great in that position. They will fit easily and sound better than the bottom and lower tier film cap offerings in that position. They just do! Wonderful for bass.

Combine a 50 & 22 uf set. Pay to have them matched within 1% of the needed 72uf. 

Film caps in that value will be both huge and very expensive! For electrolytics grannyring's advice for AN Kaisei good. I also recently used the newly released AN Seiryu in recent pre upgrade, very nice electrolytic.