Sennheiser NOISEGARD HMEC 305 - Manual (Page 34)

144
Technical data
HMEC 305 ȊHMEC 305-C ȊHMEC 322 ȊHMDC 322
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 electret mic capsule, Ȋ dynamic mic capsule,
noise-compensated, Ȋ noise-compensated,
MKE 45-1 Ȋ M-87/AIC
Frequency response 300–5,000 Hz Ȋ 500–4,000 Hz
Sensitivity – Ȋ 1.8–4 µ
V / 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 –