It depends on whether or not your speakers can be configured to use it properly, and if you've got the extra amplifier channels.
I run an active crossover (Behringer DCX2496) in my setup, with two channels of my Outlaw 7100 powering each main speaker (two-ways). However, to do this, I had to physically remove the passive crossover from my speakers, and reverse-engineer the passive crossover in order to program the active crossover to match the speaker's design. Since then I've subtly improved on the old crossover parameters with careful measurements.
If these steps are easy for you, go for it. There are even some setups these days that achieve this automatically, like the DEQX, but they're still pretty expensive. Done properly, going active is a significant improvement. But done badly, it's not going to help at all.
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