@csmgolf I had a similar issue with Focus SEs in my 20'x13' room; a little overwhelming. I found the Signature SE to be perfect in that room.
I strongly recommend that anyone considering a Pass amp (excellent products) to also consider the Coda S5.5 stereo class A amplifier (retail $6400).
Very interesting recent Audiogon thread, linked below.
Coda S5.5 50W Stereo Class A Amplifier
Regarding subs, one is fine for theatre but you will need two if you want proper stereo music reproduction.
Jim Smith of Get Better Sound fame has a large, detailed chapter on subs in his excellent book.