Tympani 4a mid-tweeter crossover, go line level...

Who has taken the specs from the passive crossover in the magnaplaner tympani T4a mid-ribbon and upgraded with quality parts? and maybe a passive line level crossover? I have been experimenting with a pro audio active splitting between a pair of ARC Classic 120s and an ARC D90b(warm on the ribbon) with pretty good results...
I have this same Q. in the speaker forum....