There are 2 mainstream methods of implementing digital active crossover.
The most comprehensive method is the DEQX. This is also the most popular method.
It offers automatic software driven calibration for both the speaker and listening environment. And will time align the drivers as well. Very sophisticated. And supports very steep - 300db/oct crossover, depending on the filter chosen. But has a higher acquisition cost.
The second method is via MiniDSP nanodigi 2x8.
Not many people know about this method, but this nanodigi is highly capable and would also sound incredibly if setup correctly.
You would also need the plugin software to work :
Unfortunately miniDSP officially stopped making nanodigi last year. But you can still source these easily from other suppliers at a reasonable cost.
Supports up to 24bit 96khz PCM and up to - 48dB/oct crossover.
The most attractive aspect is the very friendly entry cost.
It's less than 10% cost compare to DEQX.
It does not offer automatic calibration, time alignment of drivers nor room correction. All setup are done manually via the pkugin software. But if you know what you are doing, it is a straightforward way of setting up active digital crossover quickly in 15 minutes.