Sennheiser Technical data NoiseGard HMEC 25-6A / -KAP-2, General data, HMEC 25-6Ablock diagram

HMEC 25-6A block diagram

Technical data NoiseGard™ HMEC 25-6A / -KAP-2

Headphone

boom

microphone

microphone

amplifier

headphone

capsule (left)

compensation

circuit (left)

compensation

microphone (left)

compensation	headphone
microphone (right)	capsule (right)
	compensation
	circuit (right)

Transducer principle	dynamic, open, supra-aural
Frequency response	16 Hz - 22 kHz
Impedance active/passive	200 / 180 Ω (mono)
	400 / 360 Ω per side (stereo)
	same volume for active and passive
THD	< 1 %
Compensation active	15 dB ± 3 dB between 100 Hz and 2 kHz
Frequency response of
the active compensation	50 - 600 Hz
Microphone incl. preamplifier

6-pin

Redel

plug

HMEC 25-KAP-2 block diagram

Transducer principle	Noise-compensated back-electret condenser
	microphone capsule
Frequency response	300 Hz - 5 kHz (as per RTCA/DO-214)
Max. sound pressure level	120 dB
Output voltage	400 mV ± 3 dB at 114 dB
	and a distance of 6 mm
	(as per RTCA/DO-214)
Terminating impedance	150 Ω

boom

microphone

microphone

amplifier

headphone	compensation
capsule (left)	microphone (left)

compensation

circuit (left)

compensation	headphone
microphone (right)	capsule (right)
	compensation
	circuit (right)

Operating voltage	typ. 16 V DC, approx. 8 - 25 mA,
	connections as per RTCA/DO 214
General data
Contact pressure	approx. 2.5 N
Weight without cable	170 g
Cable	single-sided, total length 1.8 m
Connectors HMEC 25-6A:	6-PIN Redel
HMEC 25-KAP-2: headphone: 6.35 mm (1/4") jack plug
	microphone: PJ-068, 5.25 mm
Power supply NoiseGard™-	12 - 35 V DC
Current consumption	typ. 18 mA

PJ 068	6,35 mm
plug	plug

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