If I might jump in on a related question, I am trying to do the same thing. I know the output impedance of my preamp (200 ohm) and the input impedance of my Pwr amp (22 K ohms - single ended). When I use conventional passive crossover design calculators for figuring out a 2nd order low pass butterworth filter, I get ENORMUS values for the inductor: 4700 mH. Can this be correct? Where is a good source of the formulas that I could use for designing a passive line level crossover for biamping? Does the output impedance of the preamp figure into this at all?
thanks -- Roy3
thanks -- Roy3