The TacT 2.2 series and later (which I own) and the Lyngdorf, I believe, include an amazing amount of crossover frequencies and slopes. I went from a complex cone based and stereo biamped system into a hybrid Sanders Sound System with 48 DB slope digital crossovers.
In addition, of course, are phase controls ("moving" your speakers to within 1/4" of each other), parametric eq, and their big focus, room equalization, plus the sort of crazy option for the truly obsessed of eq'ing different labels for all to common non RIAA curves: really not so crazy if you have older labels/reissues or some of the really harshly eq'd or Aphex'ed stuff.
Like most computer based stuff in the hands of older a'philes, the learning curve is steep, but good peer support is available at Yahoo and TacT groups.
For a good hi-end system, later models or MauiMOds are just a plain necessity, esp. the DACs. And yes, I hate the ADC conversion necessary from my $20+K table and Sonus Veritas Milan phono pre, but compared to a non eq'd room, I (and you) have to balance the gain/loss. I don't like a purely analog sound at reference quality (which I like to think I am getting closer to) except through my Stax phones, when any normal (even treated) room will totally screw up nearly everything sonically unless perfectly and professionally and very expensively built for audio purposes. Even then, that's only a fixed EQ
issue and doesn't address bizarre sounding (steep and real high) crossover frequencies or phase anomolies never approached by analog crossovers or by-guess and by-God phase switches and dialed phase controls (honestly, what are your chances of you, your room, your furniture layout, your reflection patterns and your best tape measure)of hitting the sweet spot regarding phase alignment in a complex system with stereo subs and satelites?)
