Technical data

34
Technical data
HMEC 305  HMEC 305-C  HMEC 322  HMDC 322
Headphones
Transducer principle dynamic
Ear coupling circumaural, closed
Frequen cy respo nse 45–15,000 Hz
Nominal impedance active/passive 300/150 Ω, mono  50/3 5 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,  dynamic mic capsule,
noise-compensated,  noise-compensated,
MK E 45  M-87/AIC
Frequen cy respo nse 300–5,000 Hz  500– 4,00 0 Hz
Sensitivity –  1.8–4 µ V / 74 dB at 5 Ω
Max. sound pressure level 120 dB  –
Min. terminating impedance 150 Ω  –
Outp ut voltage 400 mV ± 3 dB at 1 14 dB ( as per R TCA /DO 21 4)  –
Sup ply voltag e typ. 1 6 V DC ( 8–1 6 V DC, ap prox. 8–25 mA, as per RTCA/DO 214)  –
HMEC300US.book Seite 34 Mittwoch, 7. April 2004 3:24 15