Sennheiser HMEC 400 HMEC 305-C, Hmdc, Technical data, Headphones, Microphone incl. preamplifier

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

		HMEC 305	￿HMEC 305-C	￿HMEC 322	￿HMDC 322
		dynamic
		circumaural, closed
		45–15,000 Hz
	300/150 Ω , mono				￿ 50/35 Ω , mono
	> 25 – 40 dB
	120 dB (± 5%)
		approx. 10 N
electret mic capsule,					￿ dynamic mic capsule,
	noise-compensated,				￿ noise-compensated,
		MKE 45-1			￿ M-87/AIC
		300–5,000 Hz			￿ 500–4,000 Hz
		–			￿ 1.8–4 ∝ V / 74 dB at 5 Ω
		120 dB			￿ –
	150 Ω				￿ –
	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)				￿ –

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