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Features—Benefits
• Active noise compensation
• Lightweight and comfortable
• Volume control
• MKE 45 flexible boom mic for right or left-side use
• Switchable mono/stereo
• Single-sided, round cable
• High-quality carrier bag
Technical Data
Technical Data - Headphone
Transducer Principle Dynamic, closed back
Ear Coupling Circumaural
Frequency response 45–15,000 Hz
Nominal impedance (active / passive) 160 / 150 Ω (mono), 320 / 300 Ω (stereo)
Attenuation (passive + active) > 25–40 dB
Max. SPL external noise 188 dB
Headband pressure Approx. 10 N
Technical Data - Mic w/ Preamp
Transducer principle Electret, Noise Canceling
Frequency response 300–5,000 Hz
Max. SPL 120 dB
Min. terminating impedance 150 Ω
Output voltage 400 mV ± 3 dB @ 114 dB/SPL
Operating voltage 8-16 VDC, 8–25 mA
Technical Data - Connection
Connector 6.3 mm / PJ-068 / XLR 3-pin / U-174U / XLR 5-
pin (depending on model)
Current consumption 27 mA (zero signal max. 80 mA)
Connecting Cable 1.5 m single-sided, round cable
HMEC 300
Product Variants
Mono version of HMEC 300, terminates
with 5 pin XLR HMEC 305
Mono version of HMEC 300, terminates with
U-174/U connectors for helicopters HMEC 322
HMEC 300 Low Impedance, Dynamic Microphone & Headphone
Experience excellent noise attenuation over the entire frequency range. The new HMEC 300
NoiseGard™ ensures superior speech intelligibility and voice transmission—even in the
loudest of surroundings.
This lightweight headset is fitted with a volume control for the headphones, flexible boom
microphone, collapsible cushioned headband, mono/stereo switch and the on/off switch for
NoiseGard™ circuitry with ease of use and optimum comfort in mind.
Sennheiser Electronic Corporation, 1 Enterprise Drive, Old Lyme, CT 06371
Telephone: 860-434-9190 • Fax: 860-434-1759 • Web: http://www.sennheiserusa.com
Sennheiser Mexico:
Av. Xola 613, PH6, Col. Del Valle 03100, Mexico, DF. Telephone: (525) 639-0956. Fax: (525) 639-9482
Sennheiser Canada: 221 Labrosse Ave, Pte-Claire, PQ H9R 1A3. Telephone: 514-426-3013. Fax: 514-426-3953
Manufacturing Plant:Am Labor 1, 30900 Wedemark, Germany