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Microtech Gefell KEM 975 Line Array Condenser Microphone
Microtech Gefell KEM 975 Line Array Condenser Microphone

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Microtech Gefell KEM 975 Line Array Condenser Microphone

The M300 is a studio quality compact condenser microphone perfect for vocal and instrument soloists.

The Microtech Gefell KEM 975 Cardioid Plane Microphone is a multi-capsule microphone system, using the proven M300 series ceramic capsules, which has unique directional characteristics that are largely independent of frequency. On the horizontal axis the KEM 975 has the characteristic of a cardioid microphone, whilst on the vertical axis the characteristics resemble a shotgun microphone with a very narrow acceptance angle of about 30°. The directional pattern is therefore particularly well suited to the most frequently encountered situations where the source to be recorded is widely spread, or moving across the horizontal plane, and sound arriving from other directions needs to be attenuated.

Attenuated sound may consist of unwanted noise or reflections from surfaces such as ceilings, tables or the floor. Mounting the microphone physically on its side can significantly reduce feedback problems from sound reinforcement loudspeaker installations on the side walls.

KEM 975 Top Features:

  • Multi-capsule condenser microphone system
  • Broad cardioid pattern to cover wide or moving sound sources
  • Optical display to indicate optimum recording area
  • Locate up to three times the distance of omni microphones for the same diffusion field
  • Suppress undesired refelection on the vertical axis
  • frequency response 40 - 18,000 Hz
  • Latency-free analogue signal processing
  • Transformer-balanced output, line level

For effective use of the highly directional nature of this microphone, a good understanding of the directions from which wanted and unwanted sounds arrive is important. The more care taken in positioning the KEM 975, the better the results obtained will be. Integrated front facing indicator LED helps in positioning the microphone accurately. Acoustic treatment to improve a room can be an extremely costly exercise, and perhaps not even possible when trying to achieve the average 5dB increase in operating level that the KEM 975 provides. An added benefit of the KEM 975 is its ability through skilled use of the sensitivity characteristics, to compensate for level changes if the sound source moves closer to the microphone.

Recommended applications for the KEM 975:

  • on the front, or side ends of a stage
  • at a presenterʼs lectern
  • as a table microphone
  • radio and TV productions
  • video conferencing
  • location of neighbouring unwanted noise

Experience gained from practical applications in TV production, stage-sound reinforcement and presenter amplification at lecterns, confirms the fundamental theoretical benefits of the Cardioid Plane Microphone across a wide range of varied applications.

The new KEM 975 incorporates a newly-developed low-noise pre-amplifier which increases its application in music recording. Microtech Gefell’s well-proven optical principle to generate the capsule polarisation voltage is also used in the KEM 975 – this eliminates any “nasties” on the power line getting into the audio circuit.

Delta Capsule Option

Below approx. 800 Hz, the KEM 975 cannot maintain its clubbed directivity in the vertical plane anymore due to its length and approaches a cardioid polar pattern more and more with decreasing frequency. With a process developed and patented by the Institut für Rundfunktechnik (Institute for Broadcasting Technology), the directivity and the directionality are increased in this frequency range by using the optional attachable Delta capsule which forms an equilateral triangle together with the two outermost capsules of the KEM 975. Thus, a frequency-constant directivity index is realised across the entire frequency range down to below 100 Hz. The result is a better spatial separation of sound sources with lowfrequency signal portions and a more consistent spaciousness in the recorded signal over the frequency spectrum. This is particularly advantageous for music recordings. If the KEM 975 is used for video conferences, or as a speaker’s microphone on a lectern or desk, it can be used without the Delta capsule, as speech frequencies are above the threshold where the Delta capsule is needed.

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