I am about to embark on an ambitious project to convert my 3-way towers into actively tri-amped self-powered beasts. I will build an electronic crossover (4th order, 24dB/oct Linkwitz-Riley allignment of course!) and three amps for each cabinet. All of the electronics will be attached to a large heatsink which will be bolted onto the back of the speaker cabinet. I am also considering a 3 or 4 band fully parametric EQ for only the bass section to help in room tuning. The amps will each be 100 W class A/B fully-discrete units (no op-amps). Much of the electronics will be based on projects decribed at this excellent site. I am planning to use a single 1000 to 1500 VA toroidal power transformer to power both speakers (and possibly others as well). I plan to use either Burr-Brown or Analog Devices op-amps in the crossovers and EQ. Has anyone here done such a thing before? Does anyone have any advice? I do have some experience building amps and electronics, BTW.