Lecture theatre/Assembly hall/Auditorium
These rooms are used for lectures and exams, two areas of use which are difficult to reconcile from the point of view of room acoustics. A lecture requires good speech intelligibility, while an exam needs sound to be suppressed in order for people to concentrate. If the room is also used for music and theatrical performances, planning the acoustics becomes complicated.
At the back: Ecophon Wall Panel
The ceiling: Ecophon Master
Ecophon Master/gamma (reflector) might be needed above the speaker.
Building codes and standards
UK regulations, Building Bulletin 93 (BB93), states that in lecture rooms (fewer than 50 people) an unoccupied mid frequency (Tmf) reverberation time of <0.8 seconds must be achieved. In lecture rooms (more than 50 people) an unoccupied mid frequency (Tmf) reverberation time of <1.0 seconds must be achieved.
In assembly halls and multi purpose halls BB93 states an unoccupied mid frequency reverberation time of between 0.8 - 1.2 seconds must be achieved. It also states "For very large halls and auditoria, and for halls designed primarily for unamplified music rather than speech, designing solely in terms of reverberation time may not be appropriate and specialist advice should be sought."
No Swedish Standard.