X-tro 1x15" and passive?

Planning to build two new tops this spring.

And the x-tro caught my interest, BUT i don't have the possibility to process them.
CAN i run them with passive 3-way crossover with one amp?
Will it sound ok?

And my plan is to shorten the box and only use 1x15" is that a bad idea?

I will use the tops with my jbl 2x18" reflex boxes.


Any other suggestions for good tops with one 12"-15" horns is welcome

You can run it with a passive crossover (although a pair of high wattage passive three way crossovers is not going to be inexpensive) but the delay differences for the various horn lengths will not be at all ideal.