As a previous owner of both C2's and C4's, I think you'd need a lot of room treatments to make the C4's work in that size room. The C4's are superior IME to the C2's, but neither did well at low to moderate volume levels, which is why I eventually moved on.
I know I'll get torched for this... but I'd go with Harbeth M-40.1's... very ordinary looking speakers, but very musical, not picky with amplification, great with jazz & vocals and you don't have to turn them up to ear splitting levels to have fun with them. Also recommend you ditch the solid state amps in favor of a decent tube amp.
I know I'll get torched for this... but I'd go with Harbeth M-40.1's... very ordinary looking speakers, but very musical, not picky with amplification, great with jazz & vocals and you don't have to turn them up to ear splitting levels to have fun with them. Also recommend you ditch the solid state amps in favor of a decent tube amp.