Sennheiser HMD 25-1 User Manual
HMD 25-1
Headsets | Communications Headset
General Description
The HMD 25-1 headset features dynamic, closed headphones giving
excellent attenuation of background noise, and an MD 414 super-cardioid
close-contact dynamic microphone. It has been designed specifically for
use in noisy environments.
Cat No. 003373
Technical Data
Headphones
Transducer principle..............................................................dynamic
Ear coupling .........................................................supra-aural, closed
Frequency response .................................................20 – 16,000 Hz
Characteristic SPL ..........................102 dB ± 2 dB at 1 kHz, 1 mW
Nominal impedance ..................................................600 Ω per side
Load rating............................................................................. 200 mW
THD ................................................................................................< 1 %
Contact pressure .......................................................... approx. 3.3 N
Weight (without cable)..............................................approx. 190 g
Microphone
Transducer principle..............................................................dynamic
Frequency response ...............................................100 – 16,000 Hz
Pick-up pattern ...........................................................super-cardioid
Sensitivity (free field, no load, 1 kHz).............................. 1 mV/Pa
Min. terminating impedance..................................................... 1 kΩ
Features
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Microphone with superb transmission qualities
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Very light
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Two-piece padded headband, exceptionally comfortable
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Microphone can be worn on either left or right-hand side
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Delivery includes: 1 HMD 25-1
1 MZW 414 windshield
Recommended Accessories
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Velour ear pads (1 pair) Cat. No. 069417
Replacement Parts
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Ear pads (1 pair) Cat. No. 040179
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MZW 414 windshield Cat. No. 0 25512
Connections
Connection cable........... 1.8 m, steel cable, tin-plated open ends
Microphone frequency response (near field)
measured with B&K 4227 artifi cial mouth (94 dB SPL, distan ce of 6 mm)
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