ATC SCM7 vs. Proac Studio 110

ATC will prefer more power and will have a more articulate tight and punchy
bass (no port) but it won't have as much bass extension as the Proac (reflex
ported). The ATC midrange and articulation will have the edge on Proac but the
Proac bass extension and efficiency will have the edge on the ATC. The Proac
will probably be a lot more fun (small speaker big sound) but the ATC will be
slightly more transparent and better mids. Take your pick.

I have the power to drive the ATC's. Your summary is excellent, I think, based upon reviews that I have read of each.

I'm leaning towards the ATC for the reasons that you describe as well as it being a sealed design and better suited to rear-wall installation.

I'm going to mount them on brackets attatched to a wall.

with the power, the atc

Yeah ATCs will be the best choice if you intend to mount them to the wall. Bass seems to get reinforced without blurring the image. By theory the ATCs should have better bass extension than the Proacs but not in terms of power where a ported bass alignment should give. So with the close wall positioning, the bottom octave of the ATCs will fill in quite nicely without boominess.

So with the close wall positioning, the bottom octave of the ATCs will fill in quite nicely without boominess.

I agree - the roll off on a sealed box is less steep - so ultimately you can get some useful deep bass compared to the risk of "one-note" bass that sometimes comes with small efficient ported designs.