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 (p 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
