medium to large room (45 square meters)

I listen in the nearfield (3 meters)

System is very detailed and revealing.

Very dynamic. Fantastic bass, down to 25Hz in my room. I love the delicate and extended highs. The midrange is one of the best I heard. Excellent soundstage.

In my room I have a midbass hump (+6dB around 80Hz)

I had this problem with my earlier speaker systems as well (WATT Puppy 5.1; Sonus Faber Extrema; B&W 801 III)

The tubetraps will help a little (with the articulation)

I listen to classical music (big symphonies, choral, opera)

and jazz. I have a collection of 1400 CD's.

Very happy with the Krell front and the C4 speakers.

I am considering changing the bryston monoblocks for a new Krell stereo amp FPB 300cx or 400cx and also considering to try other speaker cables (Nordost?)

My Z system power conditioner is 6-7 years old, I will start looking for a replacement.

I guess my biggest concern is the room treatment(not a dedicated room unfortunately). It has a problem with the midbass and also the room is a little bright & reverberant (on some recordings a slight exageration with voice sibilence + some ringing with the piano). The floor is marble and I only have small carpets. This should be easier to treat than the bass problem.

I am not interested in a digital equalizer / room correction component.