[sdiy] transistor active crossover? (hp bp lp)

[Andalong Dudigual]

Hello once again,
can anyone out there recomend a shematic for an active
crossover? (preferably transistor) something like a
tunable, hi pass, band pass, lo pass. where each one
is tunable individualy. I am looking for one that will
encompass a very broad frequency spectrum. I have an
op-amp schematic, but I want to "compare notes" to
find the best one.
Thanks.

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