This ensures that the lecturer's voice is audible, and that the induction loop system is
operating. The voice reinforcement system is switched on at all time. This helps the
lecturer sound as natural as possible, in keeping with the concept of concealing as
much technology as possible.
'Graded' speakers were installed in the ceiling (unlike in a simple public address
system) to add more volume at the back than at the front, creating a balanced sound
throughout the theatre.
The architects contributed to the required 'natural' audio effect by acoustically
modelling the space, to minimise sound reflections. This is most noticeable in the
gentle curve of the wall above the back row up to the ceiling.