Larson Davis SoundExpert LxT, User Manual

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LxT Manual Technical Specifications A
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Microphone Preamplifier Specifications
The general specifications for the LxT microphone preamplifiers are shown in Table A-24
Table A-24 LxT Preamplifiers
The following sections present the specifications for the four different microphone preamplifiers
which can be used with the LxT.
Model PRMLxT1
The Larson Davis PRMLxT1 is a prepolarized microphone preamplifier for use with a Larson Davis
LxT Sound Level Meter. It requires very little supply current and will drive 200 feet of cable. The
preamplifier operates over wide temperature and humidity ranges. It has a built in attenuation of 23 dB
for use with 50 mV/Pa sensitivity microphones up to 140 dBSPL.
Specifications
Unless otherwise stated, all electroacoustic values are at 23 °C, 50% RH, 7.5 Volt supply, 3 m (10')
cable and equivalent microphone of 18pF.
Frequency response
with respect to the response at 1 kHz with 13 Volts rms input and 18 pF equivalent microphone.
4 Hz to 10 Hz +0.1, -0.2 dB
12.6 Hz to 40 kHz +0.1, -0.1 dB
Lower -3 dB limit < 1 Hz
Preamp
Type
Mic.
Type
Nominal
Microphone
Sensitivity
Nominal
Preamplifier
Attenuation
mV/Pa dB mV/Pa dB re. 1V/PA
High, dB
re. 1V/Pa
Low, dB
re. 1V/Pa
PRMLxT1 377B02 50.0 23.30 3.42 -49.3 -45.6 -55.6
PRMLxT1 377C20 50.0 23.30 3.42 -49.3 -45.6 -55.6
PRMLxT1 377C01 2.0 27.30 0.058 -84.7 -81.0 -91.0
PRMLxT1 377C10 1.0 27.03 0.023 -92.7 -89.0 -99.0
PRMLxT1L 377B02 50.0 1.82 40.5 -27.8 -24.1 -34.1
PRMLxT1L 377C20 50.0 1.82 40.5 -27.8 -24.1 -34.1
PRMLxT1L 377C01 2.0 5.45 1.32 -57.6 -53.9 -63.9
PRMLxT1L 377C10 1.0 5.45 0.59 -64.5 -60.8 -70.8
PRMLxT2B 375B02 35.5 19.08 3.98 -48.0 -44.3 -54.3
PRMLxT2L 375B02 35.5 1.45 27.90 -31.1 -27.4 -37.4
Nominal Sensitvity at LxT Input Sensitivity Limits