"Do you think S5.4 is for home theatre system while C2 is a truly reference 2 channel stereo loudspeakers?"
I never thought of it that way and Im sure those who own 5.4s would argue that but I tend to agree with that more than disagree if comparing the 5.4 to the confidence line.I auditioned the 5.4s a couple times and knew that wasnt the speaker for me.I run c4s and my room isnt large at all.Its well treated yes but large no way.The C4s sound so great in my room that I passed on a few deals to change.I still strongly suggest C1s with a nice sub over C2s,guessing about the same money.C2s on this site dont sell(unless its a giveaway),C1s are gone rather quickly..again my opion only
