Sennheiser HMD 300 Pro Broadcast Headset (Without Cable)

The Sennheiser HMD 300 Pro Broadcast Headset (Without Cable) is a closed-back, circumaural communications headset with a sonic design based on the HD 250 linear headphones, giving you a detailed, linear response. The headset features a comfortable construction with split-headband padding to remove pressure from sensitive areas of the head.
With a frequency response of 60 Hz to 25 kHz, the headphones provide clear reproduction of audio, doing so while offering up to 32 dB of passive noise reduction. The headset offers a dynamic boom microphone, one that delivers a hypercardioid polar pattern for focusing on vocals, and a frequency range centred around picking up the human voice in communication settings (80 Hz to 16 kHz). You can adjust the gain of the microphone in 5 dB steps over a range of 45 dB in total.
The headband supporting the unit’s earcups is rugged, bendable, and twistable, and the boom can be worn on either side of the headset. To preserve your hearing, the headset features a switchable noise-protection mode called ActiveGard that protects against sudden bursts of sound without interrupting the signal.
The HMD 300 Pro sports a modular cable design to accommodate multiple pin-outs and configurations. Though no cable is included with the headset, each of the compatible cables sport a design that minimises handling noise; this is achieved with a small series of coils on the cable approach that decouple the cable from the headset. 
Key Features:
ActiveGard Technology

This sound compression system consists of an electrical circuit incorporated into analogue headsets.
Compression technology removes the energy from an excessive incoming signal transmitted through the communication system, leaving the signal free of distortion.
The ActiveGard circuit can be compared to an automatic and fast-working “intelligent” volume control. If an incoming signal rises to a level that is harmful to your hearing, it is instantly “turned down” to a lower, more comfortable level.
When the incoming signal returns to safe levels, ActiveGard reverts to its stand-by surveillance mode and volume is restored to its original level.

Specifications

Headphone
 

Driver Type
Dynamic

Design
Over-Ear (Circumaural)

Earcup Style
Closed-Back

General
 

Frequency Response
60 Hz to 25 kHz

Sensitivity
108 dB at 1 kHz

Impedance
64 Ohms

Maximum Sound Pressure Level (SPL)
123 dB at 1 kHz

Maximum Power Handling
500 mW

Active Noise Cancellation
No

Noise Attenuation
Up to 32 dB

Foldable
Yes

Contact Pressure
6.0 N

Microphone
 

Type
Dynamic

Pickup Pattern
Cardioid (Unidirectional)

Frequency Response
80 Hz to 16 kHz

Impedance
300 Ohms

Physical
 

Weight
0.70 lb / 319 g without Cable