If space isn't an issue and you like tweaking to then nth degree, you might want to build your own modular multi band compressor a la Billy Sheehan.
You could split your signal with a splitter, run both signals through an eq tailored to your liking then both through a compressor of your choice - perhaps a dual channel ashley than either mix back to one signal, or keep as separate signals straight to the board or 2 amps.
This gives your more control over the crossover frequencies than a single crossover knob. I do a more basic version with stomp boxes from the 2 outputs on my attitude bass. I have one signal (my treble signal) with little to no low end and lots of mid range, and flat high end. The other (my bass signal), more or less flat, with a low end boost and slight mid cut. Much more control than a simple high and low split.
Attitude II SFG; RBX-JM2; Att Std; Thumb 5 BO; Corvette Std fretless; LMII; MB 121H; Nova Dynamics; EBS Billy Sheehan; BEQ(x2); Mooer ABY; LS2; Mooer FOG; MS-60B; PT Jnr.