Well I guess the answer, like to every A/V question is, it depends lol.
I noticed shady mentioned the mangled up response. This is typical of any sub(s) in any room. That's why some of us use minidsp or bfd or antimode, etc. And yes, you can pick one up later for sure. I just know you've been sweating this, and was wondering if you considered that option, to maximize the whole thing.