Your best bet is to use windows paint, create the best approximation of the room you can with dimensions, and show furniture and speaker placement, as well as windows, hallways, fireplaces, etc. Then put it in an email with info on your listening preferences..Music/HT...Loudness...etc.. and email to firstname.lastname@example.org
You will get customer service beyond your wildest dreams.
We traded mail quite a bit....I got the 20-39PCi in a 15x20 with Cathedral ceiling and open corner....it sits 14' from me and is unreal. (20-39 is the sweet-spot...most sold size and used in the Ultra)
Your "not window shaking" comment bugs me a little....any good sub when called for will rattle most windows. (china, glasses, pant legs, etc..) And I have to tell you, that's part of the fun and experience. While most movies bass is in the 25-30Hz range, some dip below 20Hz where your not hearing but feeling it. (Machine Voice in the latest Matrix, Ice Fields in Titan AE, etc...) My foundation can move in such tracks...the kids get huge smiles on their faces...so do I! :D And dont confuse that with the noise cheap Subs make when they attempt such low tracks..I've yet been able to trip up my SVS, and doubt I ever will.
Edit...Oops.....we were typing at the same time! :D Good luck, you'll love it!