I have a C2300 that I'm running with MC601 mono blocks. I had an MC352 before, and the difference is there but it's not day and night. Like someone else said - it's very subtle. The reason I upgraded other than that subtle difference, is the design and look of the 601's. Personally, I really don't care for the cosmetic design of the MC402. In any case- you can't go wrong with a C2300. It's my favorite.
Stereo or monoblocks
I recently bought a pair of the JBL HDI-3800 speakers. I also own a McIntosh C-2300 preamp. Should I buy a used McIntosh mc402 stereo power amp or try to find a pair of a different brands monoblocks? The new Schiit Tyr has my interest.