Speaker installation hard to tell, I can't see though walls.
Regrettably this is the only picture I could get at the time. The day was getting near to the end to catch the coach back home, plus the THX cinema rather busy at the time. Oh, well perhaps next time, around when I take another trip to London.
Curzon THX cinema is located over on the other side from Leicester Square just behind China Town yes London has a China Town, London what a place to be at.