Audio Engineering

844 Chapter 29

 10

0

10

20

30

40

50

60

70

31.5 63 125 250 500 1000 2000 4000 8000

Frequency (Hz)

Octave band sound pressure level dB ref 2

10

^5

N/m

2

NR

0

10

5

25

30

35

40

45

50

55

60

15

20

Figure 29.2 : NC curves.

Table 29.1

Studio/recording environment NC/NR requirement

Studio with close mic technique (300 mm) (bass cut may be

required)

30

TV studio control rooms 25

TV studios and sound control rooms 20

Nonbroadcast–preproduction 25

Broadcast studio and listening rooms 15–20

Music sound studio 15–20

Concert halls 15–20

Drama studios (broadcast) 15

Sound effects and postproduction (preferred) 5

(max.) 15

Commercial recording and pop studios (depending on type and

budget)

15–25