View source for Sennheiser HDA280 specifications

==Description==
[[File: Sennheiser_HDA280_frequency_spectrum.png|thumb|Sennheiser HDA280 frequency spectrum]]
The HDA 280 is a pair of closed, dynamic headphones designed for use with audiometers.
*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

{| class="wikitable"
! Specification
! Value
|-
| Frequency response (headphones)
| 20 - 20000 Hz
|-
| Characteristic SPL
| 117 dB
|-
| Contact pressure
| 5 N ± 0.5 N
|-
| Ear coupling
| supraaural
|-
| Connection cable
| 3 m
|-
| Transducer principle
| dynamic, closed
|-
| Weight
| 330 g
|-
| Nominal impedance
| 37 Ω
|-
| Nominal load rating
| 500 mW (EN 60268-7)
|}