Earphones - IEC Speech RETSPL
Transducer
DD45
DD45
TDH50
TDH50
HDA200/DD450 HDA300
Impedance
10 Ω
10 Ω
60 Ω
60 Ω
23 Ω
23 Ω
Coupler
318-3
318-1
318-3
318-1
318-1
318-1
RETSPL
RETSPL
RETSPL
RETSPL
RETSPL
RETSPL
Speech
20
20
20
20
20
20
Speech
Equ.FF.
3.5
4.5
2
3
3.5
1
Speech Non-
linear
6
7.5
7.5
7.5
5.5
2
Speech noise
20
20
20
20
20
20
Speech noise
Equ.FF.
3.5
4.5
2
3
3.5
1
Speech noise
Non-linear
6
7.5
7.5
7.5
5.5
2
White noise in
speech
22.5
22.5
22.5
22.5
22.5
22.5
•
DD45 (G
F
-G
C
) PTB-DTU report 2009-2010.
•
TDH50 (G
F
-G
C
) ANSI S3.6 2010.
•
HDA200 (G
F
-G
C
) ANSI S3.6 2010 and ISO 389-8 2004.
•
HDA300 (G
F
-G
C
) PTB report 2013.
•
IEC Speech level IEC60645-2 1993 (acoustical linear weighting)
•
IEC Speech Equivalent free field level (G
F
-G
C
) from IEC60645-2 1993 (acoustical equivalent
sensitivity weighting)
•
IEC Speech Not linear level 1 kHz RETSPL (DD45-TDH50-HDA200-HDA300) and EAR 3A – IP30
- B71- B81 IEC60645-2 1993 (no weighting)