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25
dB
(1 Pa/V)
Hz
24
dB
(V/Pa)
Hz
-100
-95
-90
-85
-80
-75
-70
-65
-62.5
-60
-55
-50
90
200
500
1k
2k
5k
10k
20k
Frequency response curves and polar diagram
Diffuse field frequency response Headphones
Polar diagram Microphone
Frequency response curve Microphone
(measured in the near field with artificial mouth B&K 4219)
Specifications
HMD 280 PRO / HMD 281 PROȊ HMD 280-13 / HMD 281-13
Headphones
Classification
(as per IEC 268-7) 268-7-IEC-DCSC-64R0-2/-1 Ȋ 268-7-IEC-DCSC-03R2-2/-1
Transducer principle dynamic Ȋ dynamic
Impedance 64 (as per IEC 268-7) Ȋ 300 (as per IEC 268-7)
Long-term max. input power 0.5 W (as per IEC 268-7) Ȋ 0.5 W (as per IEC 268-7)
Ear coupling circum-aural Ȋ circum-aural
Frequency response
(–10 dB referred to 1 kHz) 8 Hz—25 kHz Ȋ 8 Hz—25 kHz
Sound pressure level 102 dB (as per IEC 268-7) Ȋ 102 dB (as per IEC 268-7)
113 dB / 1 V
rms
Ȋ 107 dB / 1 V
rms
Ambient noise attenuation max. 32 dB Ȋ max. 32 dB
THD < 0.1 % (at 1 kHz, 100 dB SPL) Ȋ < 0.1 % (at 1 kHz, 100 dB SPL)
Weight approx. 310 g / 245 g Ȋ approx. 310 g / 245 g
Contact pressure approx. 4 N Ȋ approx. 4 N
Length of coiled cable min. 1 m Ȋ min. 1 m
max. 3 m Ȋ max. 3 m
Microphone
Transducer principle dynamic Ȋ dynamic
Type of microphone pressure-gradient Ȋ pressure-gradient
Pick-up pattern super-cardioid (see polar diagram) Ȋ super-cardioid (see polar diagram)
Nominal impedance 200 Ȋ 200
Close-talking sensitivity –63 dBV/Pa (at 1 kHz) Ȋ –63 dBV/Pa (at 1 kHz)
0.7 mV/Pa (at 1 kHz) Ȋ 0.7 mV/Pa (at 1 kHz)
Near field frequency response 50–13,500 Hz Ȋ 50–13,500 Hz
13


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