Actually I'd like to build a whole new system. Bass bin, midhorn and tweeter, and I'm considering regular crossover and biamp choice for the bass bin to upper stages. I would like to be able to use both of my amplifier systems, an old hafler 100w for below and tube mono,s for above. Would a conventional 24 db electronic crossover be compatable with what the design of the regular crossover intended? That is, the rate of slope to attenuation is not "the" crucial factor for a smooth transition to the midhorn? I seem to remember equal summation for the two drivers. Also I guess the jbl 2012h is a rare find to be had as I meantioned prior. Funny, I see it still for sale on foreign pro audio websites. Rick