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Shure Incorporated
18/22
RPM400 Preamplifier
Output Impedance
100Ω
Connector
Three-pin professional audio (XLR), male, balanced
Output Clipping Level
3.0dBV,1kHzat1%THD,typical
Microphone Bias
5VDC
Polarity
Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Sensitivity
TL46 into RPM400LEMO 31.0dBV(28.2mV)at1kHz[2]
TL45, TL47, TL48 into RPM400LEMO 39.0dBV(11.2mV)at1kHz[2]
TL46 into RPM400MTQG 37.0dBV(14.1mV)at1kHz[2]
TL45, TL47, TL48 into RPM400MTQG 45.0dBV(5.62mV)at1kHz[2]
Maximum SPL[4]
TL46 into RPM400LEMO 128.0dBSPL,1kHzat1%THD,typical
TL45, TL47, TL48 into RPM400LEMO 136.0dBSPL,1kHzat1%THD,typical
TL46 into RPM400MTQG 134.0dBSPL,1kHzat1%THD,typical
TL45, TL47, TL48 into RPM400MTQG 142.0dBSPL,1kHzat1%THD,typical
Dynamic Range
TL46 into RPM400LEMO 104.0dBtypical
TL45, TL47, TL48 into RPM400LEMO 111.5dBtypical
TL46 into RPM400MTQG 110.0dBtypical
TL45, TL47, TL48 into RPM400MTQG 117.5dBtypical
Power Requirements
MTQG 11–52VDC[1]phantompower,4.8mA
LEMO 11–52VDC[1]phantompower,5.5mA
[1]All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower
voltages, but with slightly decreased headroom and sensitivity.
[2] 1 Pa=94 dB SPL