Sennheiser HMEC 250 Microphone incl. preamplifier, Connector assignment, ¼” 6.35 mm jack plug

Sound pressure level passive	98 dB at 1 kHz, 1V
active	100 db at 1 kHz, 1 V
THD at 94 dB SPL	< 1 %
Attenuation	13–34 dB passive
	attenuation, plus
	16–25 dB active noise
	compensation at
	low frequencies
Contact pressure	approx. 5 N

Microphone incl. preamplifier

Type	MKE 46
Transducer principle	pre-polarized
	condenser microphone,
	noise-compensating
Frequency response	350–6,000 Hz
Output voltage	40 mV/Pa (factory pre-set)
	= 400 mV at 114 dB SPL
	(adjustable from 17–100 mV/Pa)
Terminating impedance	150–2,200 Ω
Supply voltage	8–16 V DC
Connector assignment
¼” (6.35 mm) jack plug	5.25 mm jack plug
1 Audio Hi left	1 not assigned
2 Audio Hi right	2 Microphone Hi
3 Audio Lo	3 Microphone Lo

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