I've started to play with active crossovers and DSP with my UMIK-1 and miniDSP. I have removed the crossovers from my 3-way Heybrook Sextets and by using two miniDSP 2x4HD reproduced the original crossover parameters. The next stage was to use REW (Room Equalisation Wizard, an amazing piece of free software) to analyse my room to see the peaks and troughs.

By taking this curve and applying the required profile (ie. slight bass rise, flat mid, gentle treble rolloff) REW will create the necessary filters to apply to miniDSP, once applied you can sit back and listen to your results.

My next stage will be profile each drive unit to create the 'perfect' response for each unit and then bring them all together.

I'm very impressed with the results so far, just got to sort out my amplification....but that's a big can of worms.