Sennheiser HDA 280 Manual, Specifications

Cat. No. 009860
HDA 280
Audiology |    Special  Headphones 
Description
The HDA 280 is a pair of closed, dynamic headphones designed for use 
with audiometers.
Technical Data
Frequency response ...................................... < 20 Hz to > –20 kHz
Transducer principle................................................ dynamic, closed
Nominal inmpedance ..................................................................37 Ω
Characteristic SPL ....................................117 dB (at 1 kHz, 1 mW)
Max. nominal continuous 
input power .....................................500 mW (as per EN 60268-7)
Ear coupling ........................................................................supraaural
Contact pressure...............................................................5 N ± 0,5 N
Weight (with cable).................................................................. 330 g
Connection cable..................................... approx. 3 m, open-ended
Core assignment .................................................................green + L
  copper — L
  red + R
  copper — R
Replacement Parts
 Headband  Cat. No. 083321
Product Variants 
 HDA 280-N (24 units/carton)  Cat. No. 009861
Features
  Position-independent audiometer headphones
  Type approved by the German Physikalisch-Technische Bundesanstalt 
(PTB) as per IEC 60645-1
  Excellent reproducibility of measurements
  Soft, exchangeable ear pads
  Space-saving design with collapsible, rotating ear-pieces
  Comfortable to wear due to exchangeable headband padding
  Single-sided, exchangeable cable

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