Holy necro-thread, Bat Man!
You're going from a 960ft3 room to one over 11,000ft3. You're going to need a much bigger speaker to fill that space at even moderate levels. You're also going to need a speaker with controlled directivity - horns. That means either vintage Altec, JBL, or some of the newer JBLs, like the 4367. If you can find a pair of Altec Model 19s, JBL L-200 or L-300 you would have a great match for your room. Small stand speakers like your Tannoys or the Dynaudio 1.3se are fine in their intended environments, like your old room, but not in an 11,000 ft 3 room. Unless you never plan on sitting more than 6 or 8 feet away.