Outdoor Preamplifier with Automatic Calibration Check

Outdoor Preamplifier | Model PRM2103

PRM2103 outdoor microphone preamplifier


  • Use with Model 831 sound level meter
  • Free-field, random or 90° response using the same microphone and the Model 831
  • Remote system check simultaneously at five different frequencies
  • Rugged stainless steel construction
  • Internal temperature and humidity sensor
  • Built-in heater with intelligent control
  • minimize power usage and prevent condensation.
  • Broad temperature range (-40 °C to 70 °C)
  • No desiccants needed
  • Use with EPS2116 Outdoor Protection


  • Unattended Outdoor Installations
  • Environmental Noise Studies
  • City Noise Monitoring
  • Industrial Noise Monitoring
  • Airport & Traffic Noise
  • Compliant Investigation
  • IEC 61672 Class 1 Compliant Measurements
The Larson Davis PRM2103 has been designed to be used with an environmental shroud for portable or permanent outdoor use in a wide range of weather conditions. The PRM2103 combines the cost savings of a standard preamplifier with features for unattended monitoring and an inexpensive shroud to create a product that is ideal for remote sound level measurement.

New in the PRM2103 is an automatic calibration check that checks five different frequencies all at the same time which enables better detection of any failure. When used with the Model 831 sound level meter, the acoustic response can be selected as free-field, random or 90 degree using a simple setting on the sound level meter. Because of this flexibility, only one preamplifier is necessary and there is no need to use different microphones for different fields.

Because field visits to a remote monitor can be expensive and time consuming, the PRM2103 has been designed to require no routine maintenance. It includes a built-in humidity and temperature sensor and can automatically turn on an internal heater when there is a risk of condensation. All this has been accomplished while keeping power usage low (< 2 mA with heater off) so that the PRM2103 is an excellent solution for battery powered applications.