Hitachi RAM-130QH5 Service Manual page 22

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SOUND PRESSURE LEVEL
MODEL : RAM-130QH5 (Cooling)
90
80
70
60
50
40
30
20
APPROXIMATE
THRESHOLD
FOR
CONTINUROUS
NOISE
10
63
HEARING
125
250
O c t a v e
b a n d
500
1000
M a i n
w a v e l e n g t h
– 24 –
2000
4000
[ H z ]
8000

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