Sennheiser MKH 70 P48 User Manual page 7

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82
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Technical data
Acousticprinciple . . . . . . pressuregradient! interference receiver
Directional c haracteristic. . . . . . . . . . . . . supercardioid I lobe
Frequency responserange. . . . . . . . . . . . 50 to 20000 Hz
Free-field, no-load transmission factoraU kHz 50 mVI Pa(15mV IPa)
b -28dBV (-38dBV)
Equivalent s oundpressurelevel
as per DIN45500, curveA . - . . - - . - 8 dB (15 dB)
as per DIN45405 I CCIR 468 - - . - - . 20 dB (26 dB)
Max-soundpressurelevel. - - . . - 123dB (133dB)
Output- - . - - . - . . - - . . . . . . . . . . . . . . balanced
Nominalimpedance. . . - . . 150Ohm
Min.terminatingimpedance. . . . . . . . 1000 Ohm
Pre-attenuation. . . . . . . . . . . . . . . . . . . 10dB,defeatable
Setting the pre-attenuation and filters
Preattenuation (S1)
PadswitchSI is usedto attenuate micro-
phonesensitivityby 10dB.Thisfeature
shouldbe usedonly whenthe mlcrophone
Inputat downlineequipmentis not
designed to handlethe highmicrophone
output voltagesgeneratedat highsound
pressurelevels(whIch wouldresultIn
distortionl-
Settingthe roll-offfilter (S2)
The MKH 70 P48 is equippedwith a switch-
ableroll-off filterto avoidlow-frequency
interference dueto handlingor windnOlse.
Low-cut f ilter. .
Roll-off f ilter
Presence filter. . . .
Powersupply
Supplyvoltage
Supplycurrent
Dimensions in mm . .
Weight. . .
Standardequipment.
Values in bracketswith padswitchin position- 10dB.
SubJect to alterations-
The effectof the roll-offfilter on the
frequencyresponse ISshownon page14.
Regardless of the settingof switchS2,
a cut-offfilter is effectivebelow70 Hz
to suppressdisturbances dueto low-
frequencyair or bodynoises(subsonic
signals).
Settingthe presence filter (S3)
The presence filter servesfor eompensa-
tion of lossesat the highfrequencyend
due to propagation lossandwlndscreens.
The effeetof the filter on the frequency
responseist shownon page14.
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. 18dBI oeL below50 Hz
. additional 3 dB attenuation at 70 Hz
. 5 dB emphasls at 10 kHz
. . . . phantomsupply'asper DIN45596
. 44 to 52 V
.2 mA
. 25 i/Jx 410
. . . . approx.180 g
. . . . . 1MKH70 P48 microphone
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