The collective experience of many old-timers is that the room is far more important than is generally acknowledged and that effort spent there is worth some multiple of effort and expense for gear. Keep that in mind.
The CS2 is old, designed in 1984 and released in 1985. There are qualitatively better caps and resistors that can upgrade your sound. Your tweeter is obsolete; we are working on a replacement. Your midrange has a drop-in replacement / upgrade available through Coherent Source Service or directly from Madisound, the importing distributor. There is a long history on this thread of the flow and intent of an ongoing upgrade project.
I'll try to talk about the CS2 in particular soon - it hasn't yet been addressed.