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Technical data
HMEC 355 Ȋ HMEC 355-C Ȋ HMEC 372 Ȋ HMDC 372
Headphones
Transducer principle dynamic
Ear coupling circumaural, closed
Frequency response 45–15,000 Hz
Nominal impedance active/passive 300/150 Ω, mono Ȋ 50/35 Ω, mono
Attenuation (active and passive) > 25–40 dB
Max. sound pressure level 120 dB (±5 %)
Contact pressure approx. 10 N
Microphone incl. preamplifier
Transducer principle pre-polarized condenser mic capsule, noise-compensated, MKE 45-1 Ȋ dynamic mic capsule,
Ȋ noise-compensated,
Ȋ M-87/AIC
Frequency response 300–5,000 Hz Ȋ 500–4,000 Hz
Sensitivity – Ȋ 1.8–4 µV / 74 dB at 5 Ω
Max. sound pressure level 120 dB Ȋ –
Min. terminating impedance 150 Ω Ȋ –
Output voltage 400 mV ± 3 dB at 114 dB (as per RTCA/DO 214) Ȋ –
Supply voltage typ. 16 V DC (8–16 V DC, approx. 8–25 mA, as per RTCA/DO 214) Ȋ –