I am only using one of the TN1s in my big room. I use the other one in my bedroom!
I found the one, properly placed, for us is working great. I can't tell where the bass is coming from. Maybe if I really, really focused and closed my eyes I might.
My opinion is try the one TN1 and if you want another, get another one. The space difference is minimal to me. And I like the height/shape on the TN1.