ATC scm 19 vs ATC scm 20SL?

Any comments on the sound of the SCM16A with a good tube preamp (say one using PX4 & 6NS7 tubes? Thanks!

OK, thanks. What about the sonics of the SCM16A in general (especially vocals)? I am thinking of moving (up?) from a pair of Quad 12L actives.

I have seen no info in the forums on these here in Audiogon or some other popular sites. (I'm kind of surprised at that.)

There are few choices in high-end small/medium active speakers it seems to me.

The Quads are nice and listenable, but they don't really have a sense of palpable images that I usually look for in high end speakers (thought they are new & not really run in yet...)

Thank you.

Another thread (on the SCM19) I read called ATC ruthlessly revealing, but some larger ones I heard some years back did not sound that way (just musical but clear and even silky but with impact).
So are they revealing with piercing highs or (as a former Wilson WP owner) Wilson scratchy vocals, with "accuracy" in the ear-bleeding sense?

Again, I am looking at the smaller active ones, like the scm16a or similar.

Thanks.