Help with these 3 subs

[jmr27]

Hello all,

I have a pinnacle sub sonix 200watt sub. I may add anothe one soon.

Though i may look into the BIC f12 or the V1220. My room is 9x12x24, 8ft ceilings.

I have a Yamaha rx700 reciever. So my question is which is the better of the 3?

I heard 2 subs make a difference so this is what i may do; add 2 of either... or use just one BIC alone...sounds confusing yes... thx