With the 4-channel Chakra C4100, I can drive my Katans in active mode I believe.
Before you needed 2 poweramps like the Lk 85 or LK 140 to go active.
The Exotik pré is probably the one to go, but is too expensive for me, the Kolektor is still in production or maybe a Quad 99 pré (if that works well?).