I have Triton 7 and thinking to add SuperCenter X/XL. My room size is about 22X22X10. Should I go for X or XL? I don;t have sub as yet. Please suggest should I set FL/FR and SuperCenter X/XL to large or FL/FR to large and SuperCenter X/XL to small?
Thanks.

Either SuperCenter model would be fine, although given the large room and no sub, I would suggest the XL. If you do not have a subwoofer set the Triton Sevens and the SuperCenter XL to Large, set subwoofer to No. Given the room size, the addition of a subwoofer is recommended and will significantly increase the playing ceiling (how loud the system will play).

Could you please recommend which force field I should go for this size of room? If I decided to add sub then is it okay to go with SuperCenter X or still I should go for XL? Thanks.

If you add the sub the SuperCenter X will be fine. Any of the ForceField subs will be a worthwhile addition and give the system a lot better dynamics (all speakers set to Small and an 80 Hz crossover). If you want to pound the room, get the 5.