BRUEL & KJAER 4128-C - Page 38

HATS Type 4128-C, Handset Positioner Type 4606 – User Manual32
Fig.2.12 The sidetone characteristic of Type 4128-C for both an open and closed ear
(100Hz – 20 kHz)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
100 1k 10k
Frequency (Hz)
dB
Closed ear
Open ear
100k
990225