I've used a Marchand electronic crossover in my desktop system for several years. It really gets the job done nicely. I did some not-so-rigorous comparing of the sound w/ & w/o the crossover. I couldn't distinguish any sonic differences with it in vs out of the circuit.
There are a number of models to choose from. Mine has a variable crossover (very handy). But I've heard the models that use a fixed crossover have that nth degree more purity of sound...? Who knows.
Here's mine:
https://www.marchandelec.com/xm66-electronic-crossover.html
Prices from 2016 were $800 for my XM66 (new). If you can settle on a fixed frequency, the XM9 is $600. Both show up used occasionally (XM66 rarely; XM9 not quite as rarely).
There are a number of models to choose from. Mine has a variable crossover (very handy). But I've heard the models that use a fixed crossover have that nth degree more purity of sound...? Who knows.
Here's mine:
https://www.marchandelec.com/xm66-electronic-crossover.html
Prices from 2016 were $800 for my XM66 (new). If you can settle on a fixed frequency, the XM9 is $600. Both show up used occasionally (XM66 rarely; XM9 not quite as rarely).