McIntosh 2105 pairing with Klipsch Cronwall’s?

Since the Cornwall IV are I believe 94db efficient, you will have more than enough power for them, and then some. 

Congratulations ... let us know how they pair to your ears ... loudness will not be a problem

My "somewhat close" experience was with a well-maintained Mc2100 (2105 minus the meters) and Altec Voice of the Theaters (with large unforgiving horns, IMO). I enjoyed that setup for about ten/fifteen years, with TTs and later with CDs.

As I branched out, starting in about 1990, I found that many amplifiers -- including Mc SS and certainly the Mc60 and Mc225 amps that I still own today -- sounded smoother. I attribute the harsh sound to the 2100, and I'm sure the PA horns of the Altecs emphasized the harshness I heard. I don't know, but I would expect the Klipsch voice will be slightly or significantly more forgiving.

Of course, depending on room characteristics, equipment arrangement, music source, and music mix, your setup will be different. 

Let us know how it goes.

Congratulations on your new Amps!

Even though you already placed the order, it is great to read/learn from all of the responses.  I hope they meet your hopes and expectations.

I'm currently running a McIntosh C-32 preamp and MC2205 to a pair of Klipsch Forte IV's in a very large room.  I'm very pleased with the performance of the system.