active X-over

Check out Elliot Sound Products and Linkwitz Lab for some great help in designing your own active crossover. I recommend 4th order, 24dB/octive, Linkwitz/Riley. I have an assembled 4-way kit from Marchand Electronics with balanced inputs and outputs. It is just fabulous but it cost $1000US. I am also builing one from scratch just to say I did it. The parts will cost about $250US. Active crossovers are not that difficult to understand and build once you get a handle on the basics.