I have a Classik-K and use Dynaudio's 52-SE with great results. I have tried the Katans in a medium sized room but found the bass too lean. You can't go aktive with a Classik unless you buy two amps or a multichannel one. The Classik won't take Aktive Cards for the internal amp. I have heard the Classik with B & W's CM-2 and Paradigm's
Studio 20. Both are good options.
Studio 20. Both are good options.