Sennheiser NoiseGard HMDC 322 Instructions For Use Manual page 70

Technical data
Headphones
Transducer principle
Ear coupling
Frequency response
Nominal impedance active/passive
Attenuation (active and passive)
Max. sound pressure level
Contact pressure
Microphone incl. preamplifier
Transducer principle
Frequency response
Sensitivity
Max. sound pressure level
Min. terminating impedance
Output voltage
Supply voltage
144
HMEC 305 HMEC 305-C
dynamic
circumaural, closed
45–15,000 Hz
300/150 , mono
> 25 – 40 dB
120 dB ( 5%)
approx. 10 N
electret mic capsule,
noise-compensated,
MKE 45-1
300–5,000 Hz
–
120 dB
150
400 mV 3 dB at 114 dB (as per RTCA/DO 214)
typ. 16 V DC (8 – 16 V DC, approx. 8 – 25 mA, as per RTCA/DO 214)
HMEC 322 HMDC 322
50/35
dynamic mic capsule,
noise-compensated,
M-87/AIC
500–4,000 Hz
1.8–4 V / 74 dB at 5
–
–
–
–
, mono