Interesting question. I use ProAc Response 1SCs and Tablette 50 Signatures in a 12x14x8 room. I think 2.5s might be too big for this room because of all the stuff I have in it.
At the last CES Vegas show the ProAc/ARC room had a pair of the large D80s playing and they almost completely disappeared. The room was only a hotel suite with most of the furniture removed in the main living room.
Your room seems much bigger and I'm sure 3.8s would perform well there. Whether the 2.5s would or not is harder to say. A lot depends on how much furniture, plants, etc. you have sharing the space, but 13 foot ceilings may be the deciding factor.
I hope I didn't add to the confusion, heheh.
At the last CES Vegas show the ProAc/ARC room had a pair of the large D80s playing and they almost completely disappeared. The room was only a hotel suite with most of the furniture removed in the main living room.
Your room seems much bigger and I'm sure 3.8s would perform well there. Whether the 2.5s would or not is harder to say. A lot depends on how much furniture, plants, etc. you have sharing the space, but 13 foot ceilings may be the deciding factor.
I hope I didn't add to the confusion, heheh.