Sennheiser HME 25-KA-2 Adjusting the microphone gain, Technical data, General data, Headphone

dynamic, closed supraaural

30-16.000 Hz

600 Ω (2 x 1.200 Ω parallel)

97 dB ± 3 dB at 1 kHz, 1 mW < 1 %

200 mW

Back electret-condenser capsule noise compensated 300-5.000 Hz

120 dB

400 mV ± 3 at 114 dB (as per RTCA/DO-214) 150 Ω

typ. 16 V DC,

(8-16 V DC; approx. 8-25 mA as per RTCA/DO-214)

approx. 170 g single-sided, length: 1.8 m

3-pole 1/4" (6.35 mm) jack plug, wired mono, for headphone PJ-068, 5.25 mm for microphone

Mic Gain Adjustment

Adjusting the microphone gain

According to JTSO approval C58a, the microphone output voltage is factory- preset to 400 mV. If the microphone output voltage is too high or too low for your intercom system, it can be re-adjusted on the microphone. To do so, use a small slotted screwdriver and

turn the ‘Mic Gain Adjustment’ screw (see illustration on the left) until you have reached the desired setting.

Technical data

Headphone

Transducer principle

Coupling to the ear

Transmission range

Rated impedance

Frequency characteristic

THD

Load rating

Microphone incl. preamplifier

Transducer

Transmission range

Max. sound pressure level

Output voltage

Load impedance

Supply voltage

General data

Weight without cable

Connecting cable

Connection plug

6