Sennheiser NOISEGARD HMEC 305 - Manual (Page 32)

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Technical data
HMEC 300 HMEC 302 HMEC 306 HMEC 400
Headphones
Transducer principle dynamic
Ear coupling circumaural, closed
Frequency response 45–15,000 Hz
Nominal impedance active/passive 300/150 Ω , mono
600/300 Ω , stereo
Attenuation (active and passive) > 25 – 40 dB
Max. sound pressure level 120 dB ( ± 5%)
Contact pressure approx. 10 N
Microphone incl. preamplifier
Transducer principle electret mic capsule, noise-compensated, MKE 45-1
Frequency response 300–5,000 Hz
Sensitivity –
Max. sound pressure level 120 dB
Min. terminating impedance 150 Ω
Output voltage 400 mV
±
3 dB at 114 dB (as per RTCA/DO 214)
Supply voltage typ. 16 V DC (8 – 16 V DC, approx. 8 – 25 mA, as per RTCA/DO 214)