The Cardioid Plane Microphone is a multi-capsule microphone system with a unique directional characteristicsthat are largely independent of frequency. On the horizontal axis the KEM 970 has the characteristic of a cardioid microphone, whilst on the vertical axis the characteristicsresemble 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 noiseor reflections from surfaces such as ceilings, tablesor the floor. Mounting the microphone physically onits side can significantly reduce feedback problemsfrom sound reinforcement loudspeaker installationson the side walls.

For effective use of the highly directional nature ofthis microphone, a good understanding of thedirections from which wanted and unwanted soundsarrive is important. The more care taken in positioningthe KEM 970, the better the results obtained will be.Integrated front facing indicator lights help inpositioning the microphone accurately.

Acoustic treatment to improve a room can be anextremely costly exercise, and perhaps not even possible when trying to achieve the average 5 dB increase in operating level that the KEM 970 provides.An added benefit of the KEM 970, as shown in Fig.3,is its ability through skilled use of the sensitivity characteristics, to compensate for level changes if the sound source moves closer to the microphone.

on edges, or ends of stage at a presenter´s desk as a table microphone radio and TV productions video conferencing location of neighbouring unwanted noise

Initial 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.

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The KEM 970 was developed in cooperation
with the Institut für Rundfunktechnik (IRT) in Munich.

The particularity of the KEM 970 is the characteristic that the directional distribution of the sensitivity is a non-rotational-symmetrical pattern in relation to the reference axis.

Application as a table microphon

Table mounting the KEM 970 as in Fig. 4 allows microphone the to reject unwanted noise or reflections generated by the table surface.

Application at the speakers stand

With the KEM 970 positioned as shown in Fig. 4, the presenter has much greater distance and lateral freedom of movement, without the normally attendant quality problems that could be expected with conventional microphones.

application for interactive video conferences, live conferences

Application on the stage

As an example application, one or more KEM 970 microphones can be placed on floor stands near theedge of the stage, directed towards the area occupied by the actors.If the configuration shown in Fig. 3 is used, then undesirable noise emanating from the stage floor isconsiderably reduced.

If a sound reinforcement system is in use, the highly directional sensitivity of the KEM 970 on a single axis also adds increased immunity to feedback when compared to other commonly used microphones.

It is easy to imagine a numerous other applications for the KEM 970, such as creating acoustic effects inradio drama production. Different acoustic scenes can be simulated by an actor changing position aroundthe areas of varying sensitivity to influence the ratio of direct to diffuse sound.

MA 97.2 Auditorium hanger for KEM970

Frequency Responses

Polar Patterns

Prospect KEM 970

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Prospect MA 97.2

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Manual MA 97.2

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