Gefell KEM970
The Cardioid Plane Microphone is a multi-capsule microphone system with unique directional characteristics that 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.
Features
Multi-capsule condenser microphone systemBroad cardioid pattern to cover wide or moving sound sourcesLocate up to three times the distance of omni microphones for same diffusse fieldOptimum positioning using visual indicatorsSuppression of undesirable reflections on the vertical axis6 dB improvement in feedback threshold for sound reinforcement applicationsFrequency response 40 - 18000 HzLine level output, two position pre-attenuation switchHigh pass filter switchAnalog or digital AES/EBU - DPP output
Recommended applications of the KEM 970:
On edges, or ends of stageAt a presenter´s deskAs a table microphoneRadio and TV productionsVideo conferencingLocation of neighboring unwanted noise
Specifications
Cardioid level microphone KEM 975, with non-rotationally symmetrical directional characteristics
Directional
Horizontal: kidney-shapedVertical: lobar
Angle of coverage
Horizontal: 120 °Vertical: 30 °
Acoustic operation: Pressure gradient
Frequency response: 40 - 18000 Hz
Sensitivity at 1 kHz, gain 0 dB: 775 mV / Pa
Rated impedance: 40
Equivalent noise
CCIR 468-4: 24 dBDIN EN 60268-4: 15 dB-A
Noise distance (to 1 Pa at 1 kHz)
CCIR rated: 70 dBA-rated: 79 dB
Boundary sound pressure level for 0.5% harmonic distortion
Gain 12 dB 104 dbGain 0 dB 116 dBGain -12 dB 128 dBGain -24 dB 140 dBGain -36 dB 152 dB
End fittings: Neutrik XLR5M
Mass: 1.07 kg
Length: 343 mm
Diameter protection cage: 40 mm
Amplifier: 25 mm
Surface: Nickel matt, dark bronze
Power supply unit N 975
Mains voltage: 230/115 V AC, ± 10% 50/60 Hz
Connection fittings
KEM 975: XLR5FAudio signal: XLR3M
Mass: 1.6 kg
Width: 221 mm
Depth: 169 mm
Height: 45 mm
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