Why not go crossover-less?

But you lose flexibility, you have to chose the drivers and then design the crossover for them. You will not be able to use other speakers without modifying the crossover. This is why this approach, despite advantages, has never taken hold. Most audiophiles middle name is change and this renders it very difficult.

A crossover in the line stage means using at least 2 amps, you can't feed 2 signals to the same amp.