6-1
SOUND LEVEL CHARACTERISTICS
SM HDDHED 2-A.1 GB
6.
SOUND LEVEL CHARACTERISTICS
6.1
Sound Pressure Level
6.2
Sound Pressure Level Spectrum
(Measured as Figure 1)
Hz, BAND CENTER FREQUENCIES
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
-70NC
-60NC
-50NC
-40NC
-30NC
-20NC
MICRO BAR0.002 dB re , OCTAVE BAND SOUND PRESSURE LEVEL
Hz, BAND CENTER FREQUENCIES
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
-70NC
-60NC
-50NC
-40NC
-30NC
-20NC
MICRO BAR0.002 dB re , OCTAVE BAND SOUND PRESSURE LEVEL
HDD018 / HED018
HDD024 / HED024
Figure 1. Wall Mounted
