|
Occupancy
|
NCB Curve
|
|
Broadcast Studios (distant microphone pickup used)
|
10
|
|
Concert halls, opera houses, and recital halls (listening to faint musical sounds)
|
10-15
|
|
Large auditoriums, large drama theatres, and large churches (for very good speech articulation)
|
15-20
|
|
TV and broadcast studios (close microphone pickup only)
|
15-25
|
|
Private Residences:
|
|
|
Bedrooms
|
25-30
|
|
Apartments
|
28-38
|
|
Family rooms and living rooms
|
28-38
|
|
Schools:
|
|
|
Lecture and classrooms
|
25-30
|
|
Open-plan classrooms
|
33-37
|
|
Hotels/Motels:
|
|
|
Individual rooms or suites
|
28-33
|
|
Meeting/banquet rooms
|
25-35
|
|
Halls, corridors, lobbies
|
38-43
|
|
Service support areas
|
38-48
|
|
Office Buildings:
|
|
|
Executive offices
|
25-30
|
|
Conference rooms (large)
|
25-30
|
|
Conference rooms (small) and private offices
|
30-35
|
|
General secretarial areas
|
38-43
|
|
Open-plan areas
|
35-40
|
|
Business machines/computers
|
38-43
|
|
Public circulation
|
38-48
|
|
Hospitals and clinics:
|
|
|
Private rooms
|
25-30
|
|
Wards
|
30-35
|
|
Operating rooms
|
25-30
|
|
Laboratories
|
33-43
|
| Corridors |
33-43
|
| Public areas |
38-43
|
| Small auditoriums |
25-30
|
| Movie theatres |
27-37
|
| Churches |
30-35
|
| Courtrooms |
33-37
|
| Libraries |
33-37
|
| Restaurants |
38-43
|
Light maintenance shops, industrial plant control rooms, kitchens, and laundries
|
43-53
|
| Shops, garages |
50-60
|
