Problems: with no center in your small (acoustically very difficut) room, you will have to sit smack dab in the middle of the room to get a Phantom center. If you don't, yo'll have dialogue collaps into one speaker - not connecting with your monitor/video immage. If you, on the otherhand, do sit in the middle of the room by yourself, you've now put yourself in a horrible acoustical spot in your room, yes! (that's where all the nasty peaks and dips in the frequency response is.)
In small 10 x 12'ish rooms, I'm alsmost always using two seat setup's, with the seats either in the 1/3 width and lenght dimmensions, or in the 1/3 width and 1/5th lenght dimmension (or, with smaller seats, maybe 2/5th and 3/5th width positions, depending).
These positions, in relation to proper speaker settings (in rectangular closed-in rooms), offer smoother frequency response, fundamentally.
So, if it were me, I'd give up on your center, so called, "sweet spot", and do dual seating arrangements - if it were me. And, I'd be DEFINITELY chosing a center speaker, yes.
In small 10 x 12'ish rooms, I'm alsmost always using two seat setup's, with the seats either in the 1/3 width and lenght dimmensions, or in the 1/3 width and 1/5th lenght dimmension (or, with smaller seats, maybe 2/5th and 3/5th width positions, depending).
These positions, in relation to proper speaker settings (in rectangular closed-in rooms), offer smoother frequency response, fundamentally.
So, if it were me, I'd give up on your center, so called, "sweet spot", and do dual seating arrangements - if it were me. And, I'd be DEFINITELY chosing a center speaker, yes.