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Discontinued
450 SERIES II

Series II Voice Communication Microphone

Omnidirectional voice communication microphone delivers optimum speech intelligibility for fixed station applications.
Omnidirectional voice communication microphone delivers optimum speech intelligibility for fixed station applications.
Discontinued
450 SERIES II

Series II Voice Communication Microphone

Omnidirectional voice communication microphone delivers optimum speech intelligibility for fixed station applications.
Omnidirectional voice communication microphone delivers optimum speech intelligibility for fixed station applications.
The omnidirectional microphone has equal sensitivity at all angles. This means it picks up sound evenly from all directions. Therefore, the microphone need not be aimed in a certain direction, which is helpful especially with lavalier microphones. A disadvantage is that an omni cannot be aimed away from undesired sources such as PA speakers, which results in less headroom for feedback.
To capture sound, dynamic microphones use a diaphragm, a voice coil and a magnet. The rear of the diaphragm is attached to the voice coil, which is surrounded by a magnetic field. The sound picked up by the diaphragm moves the voice coil in this magnetic field and generates the electrical signal; an electrical representation of the picked up sound. They can handle extremely high sound pressure levels and are largely unaffected by extreme temperatures or humidity.
A microphone with tailored frequency response is usually designed to enhance a sound source in a particular application. For instance, a microphone may have a peak in the 2 – 8 kHz range to increase intelligibility for live vocals.
The cable does not come with any connector.
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Omnidirectional voice communication microphone delivers optimum speech intelligibility for fixed station applications, like police and schools. Features include a switch-selected dual impedance output and locking press-to-talk switch.

Main Features

  • Frequency response tailored for voice communications
  • Switch-selected dual impedance output
  • PTT switch that can be locked “On” for hands-free operation
  • Four conductor, shielded, bare-ended (no connector), straight cable
  • Adjustable height
  • Does not require DC power for operation

Description

The Shure Model 450 Series II is a high output dynamic microphone designed for paging and dispatching applications. This extremely rugged microphone features an omnidirectional pickup pattern and a frequency response tailored for optimum speech intelligibility. It also includes an impedance selection switch and a locking press-to-talk switch.

Specs

Technical specifications

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Weight:
737 g
Height x Width x Depth:
299.5 × 101.0 × 144.0 mm
Frequency Response:
Tailored
Sensitivity:
-50.50 dBV/Pa – 2.98 mV/Pa
Transducer Type:
Dynamic
Polar Pattern:
Omnidirectional
Switchable low cut:
No
Connectors:
Open Cable Ends
Attenuator:
No
Interchangeable Capsule:
No
Main Functionality:
Performance
Headphone Output:
No
Frequency Response Curve Image:
Shure Series II Voice Communication Microphone Frequency Response Curve Image

Further Technical Specifications

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Further Specs:
  • Impedance (at 1,000 Hz)
    • High Impedance: 40,000 Ω
    • Low Impedance: 210 Ω
  • Recommended Load Impedance
    • High Impedance: 100,000 Ω
    • Low Impedance: 1,000 Ω
  • Output Level (at 1,000 Hz, Open Circuit Voltage)
    • High Impedance –35.0 dBV/Pa (17.8 mV)
    • Low Impedance –57.0 dBV/Pa (1.4 mV)
  • Switches
    • Locking Press-to-Talk Switch: Activates microphone circuit and an external relay or control circuit. The microphone circuit is normally shorted. Impedance Selection Switch: Double-pole, double-throw slide switch located in the base of the microphone.
  • Cable
    • 2.1 m (7 ft.) four-conductor, two conductors shielded, non-detachable

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