At the end of the M3.3 biamping article, I’ve added a bit which obsoletes much of the earlier material on electronic crossovers. I got a Behringer DCX2496, put in Jan Didden’s passive RC outputs, and, well… the old modified X2 sits in a pile in my lab, the Acheron case was gutted and re-purposed, and things sound better than ever.
Soon to come: an RIAA preamp for MM cartridges using the same sort of balanced system design as His Master’s Noise preamp.