Panasonic WH-R17C Operating Instructions Manual page 53

Power type
 Basic frequency response curve
According to IEC 60118-7:2005
130
120
110
100
90
80
70
60
100 1k
Frequency [Hz]
 Frequency response curve
According to ANSI S3.22-2003 (Includes April 2007 Erratum)
130
120
110
100
90
80
70
60
10k 100 1k 10k
Frequency [Hz]
53