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Multi-field Microphone Type 4961

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Why Multi-field?

FREE OR DIFFUSE?
Until now you had to choose between microphones optimised for either free or diffuse sound fields.

MULTI-FIELD
In many practical situations the nature of the sound field can be unpredictable. It is rarely truly free or diffuse, but is made up of an unpredictable mix of the two. And this is what we mean by multi-field.

When you compromise on your choice of microphone, you risk errors in your measurements that could exceed 10dB at 20kHz.
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Technology

THE MICROPHONE
Multi-field microphone Type 4961 is a ¼" measuring microphone that guarantees accurate measurements in free or diffuse sound fields.

Thanks to a unique laser-welded diaphragm with extremely low tension and an active area 30% larger than for any other ¼" microphone, it has the same sensitivity and noise floor properties as a typical ½" microphone.

  • High sensitivity: 65 mV/Pa 
  • Low noise floor < 20dB(A)
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Robust & Stable

OUTSTANDING PERFORMANCE
Multi-field Microphone Type 4961’s titanium construction makes it extremely resistant to corrosion – and minimises the risk of interference from magnetic fields.

The microphone’s low tension, titanium diaphragm yields high sensitivity, low noise and a stable response. The titanium diaphragm is aged artificially to ensure excellent long-term stability.
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Limitations?

Typically you would expect a bandwidth between 70 to 100 kHz and a max. SPL of up to 165 dB from a ¼" measurement microphone.

Multi-field Microphone Type 4961 offers:

20 kHz BANDWIDTH
  - which covers the audible range of human beings

130 dB MAX. SPL
  - which covers up to the threshold of pain

Instead you get the low noise floor and high sensitivity of a ½" microphone, low sensitivity to the angle of incidence and guaranteed excellent results in free, diffuse and multi-field conditions.
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Applications

For most practical situations, such as in the cabin of an aircraft or the interior of a family car, the sound fields are extremely difficult to predict. An aircraft’s internal sound environment undergoes changes: engines roar during take off, air conditioning systems pressurise the cabin as the aircraft climbs, the overhead locker above seat 17 might start to rattle as the aircraft approaches its cruising speed. Whenever you need to measure in changing sound fields the multi-field microphone is the ideal solution.

TYPICAL APPLICATIONS

  • Cabin noise measurement
  • Engine near-field measurement
  • Unpredictable sound field conditions
  • When the dominant sound source shifts over time 
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What Next?

If you’d like to try out, or learn more about, the multi-field microphone:

> ASK questions

> CONTACT local office

> REQUEST a quote

> Brochure

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