Sennheiser HMD 280 - Manual, Technical Data

Cat No. 004976
HMD 280 pro
Headsets |  Communications Headset
General Description
The HMD 280 pro headset has been specially designed for communica-
tions in high-noise environments. Its dynamic, super-cardioid microphone 
has been optimised for close talking distances.
Features
 Noise-compensated microphone with extremely low handling noise
 Microphone can be worn on either left or right-hand side 
 Easily replaceable, single-sided coiled cable
 Very good attenuation of background noise
 Space-saving design with rotating earpieces
 Replaceable parts for long life
 Lightweight design
 Delivery includes:  1 HMD 280 pro
1 windshield
Replacement Parts
  Ear pads (1 pair)  Cat. No. 085733
 Headband padding  Cat. No. 083321
 Connection cable   Cat. No. 082072
 Windshield  Cat. No. 083411
Product Variants
  HMD 280-13: as HMD 280 pro, but with 300 Ω 
headphone impedance  Cat. No. 004977
  HMD 281 pro: as HMD 280 pro, but single-sided 
headphone, weight (w/o cable): approx. 245 g  Cat. No. 004978
  HMD 281-13: as HMD 281 pro, but with 
300 Ω head phone impedance  Cat. No. 004979
Technical Data
Headphones
Transducer principle..............................................................dynamic
Ear coupling ........................................................ circumaural, closed
Frequency response ....................8 – 25,000 Hz (–10 dB / 1 kHz)
Sound pressure level.............................102 dB (as per IEC 268-7)
Attenuation .......................................................................max. 32 dB
Nominal impedance ...............................................64 Ω per system
Load rating.................................................................................. 0.5 W
THD ............................................................................................ < 0.1 %
Contact pressure.............................................................. approx. 6 N
Weight (w/o cable).....................................................approx. 310 g
Microphone
Transducer principle..............................................................dynamic
Frequency response ................................................. 50 – 13,500 Hz
Pick-up pattern ...........................................................super-cardioid
Sensitivity (free field, no load, 1 kHz).............................. 1 mV/Pa 
Nominal impedance ................................................................. 200 Ω
Connections
Connection cable...................................unterminated coiled cable, 
       min. 1 m/max. 3 m
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
Microphone frequency response (near field) 
measured with B&K 4219 artificial mouth 
Microphone Pick-up Pattern

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