5W Active Modular Amplified Monitor Speaker


The RTS® Model LMS-325 Line Monitor Speaker Station is a modular amplified speaker that can be used to monitor one or two intercom or program channels.  It features 5 watts of drive power and includes a wide range 8 ohm speaker.  The LMS-325 is in the standard 1 RU, ½ rack width form factor of other RTS® intercom products, including the RM-325 Intercom station, the MRT-327, MCE-325, SSA-324 and others.  A large variety of mounting options and hardware are available to suit any application.

The LMS-325 has separate phono jacks for each program input and an XLR-3 connector for a two channel RTS® intercom line.  A rear panel adjustment allows the user to set relative levels between the two input channels.  The LMS-325 is magnetically shielded to allow it to be placed adjacent to video monitors without affecting their display alignment.  The unit is powered locally from a supplied power pack to allow operation with dry audio signals and to prevent loading of the RTS® TW intercom channels.


  • Dual channel inputs from RTS® TW Intercom or 2 separate program inputs.
  • Full Range 5 Watt Speaker and Power Amplifier
  • Standard 1/2 rack width 1 RU configuration, compatible with MCE-325, MRT-327, LMS-325.
  • Magnetically shielded enclosure allows for use adjacent to video monitors without picture degredation.
  • Locally powered to allow use with any audio or intercom source.


  • Impedance: 8 ohms
  • Power Rating: 5 watts
  • Sensitivity: 90± 2dB/2.83V/meter on axis averaged over one octave bands centered at 250 Hz, 500 Hz, 1kHz, 2 kHz, 4 kHz and 8 kHz when enclosed in a sealed box with a volume of 1.3 liters.
  • Frequency Response: 200 Hz to 10 kHz± 4 dB on 1/10 octave measurements in a sealed box with a volume of 1.3 liters.
  • Free Air Resonance: 200 Hz to 250 Hz
  • Stray Magnetic Field: Less than 1 gauss at a distance of 1 cm from chassis
  • Mechanical Noise: Free of buzzes and rattles with 5W sinewave input from 100 Hz to 22 kHz.
  • Environmental Requirements:
    Storage: -20ºC to 80ºC; 0% to 95% humidity, non-condensing
    Operating: 0ºC to 50ºC; 0% to 95% humidity, non-condensing.
  • Dimensions: 1.72" (44mm) high, 8.2" (208mm) wide, 8" (203mm) deep
  • Weight: 2 lbs, 12 oz (1.25kg)

Connector Pin Configurations:

  • Speaker Inputs:
    Type: RCA Phono Jacks
    Tip: Audio
    Sleeve: Common
    Type: XLR-3F
    Pin 1: Common
    Pin 2: RTS® Channel 1 audio
    Pin 3: RTS® Channel 2 audio
  • External Power:
    Type: 2.0 mm jack
    Internal Pin: positive (+) 12-15 VDC
    External Shell: negative (-)

Speaker Amplifier:

Note: Specifications are for Input 1 with the balance control set for minimum attenuation. Specifications for Input 2 are identical.

  • Input Impedance: 47kOhm
  • Input Level: 0.7 Vms
  • Output Amplifier Power: 5W maximum, 4W continuous into 8 ohms
  • Signal-to-Noise Ratio: 75 dB, reference 2W into 8 ohms
  • Total Harmonic Distortion: Less than 0.5% at 2W nominal
  • Balance Control: 12 dB maximum relative attenuation

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