non-polar cap?

[ferninando]

what if you used a regular polarized cap in place of a non-polar cap in a crossover? In the woffer after the coil,
to gnd(-)?:scratch2:

 

[steerpike2]

It will have a short life, then go electrically leaky, or worse, short-circuit.
Two polarised capacitors, connected (-) to (-) can be safely used instead. The value of each needs to be twice what you calculated for a single cap.

 

[Dan ʕ•ᴥ•ʔ]

Just bite the bullet, buy the correct cap and avoid the grief later.