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  • ST-HP3

    High Pass Filter - 300 Hz and 500 Hz

    • Horn Loudspeaker Protection
    • Low-Frequency Attenuation below 300 Hz
    • Low-Frequency Attenuation below 500 Hz
    • Line-Level Input and Outputs
    • Filtering Requiring no Field Adjustment
    • RDL® SupplyFlex™ Power Input Configuration

  • ST-IC1

    Intercom Amplifier

    • Intercom Electronics
    • Intercom with Push-to-Talk
    • Mic or Speaker Input
    • 8 Ω or 45 Ω Speakers
    • Bidirectional Communication Option

  • ST-LCR1

    Logic Controlled Relay - Momentary

    • Add Contacts to Any Control Signal
    • Activation from Logic Circuits
    • DPDT Switching Relay
    • Open-Collector Switching
    • Control from Switch, Button or Logic Circuits

  • ST-LCR1H

    High Power Logic Controlled Relay - 8 A

    • Switching of Speaker Lines
    • Control from Switch or Logic Circuits
    • DPDT Switching Contacts
    • Open-Collector Switching
    • 8 Amp Relay Contacts

  • ST-LCR2

    Logic Controlled Relay - Latching

    • Alternate-Action Switching
    • Add Contacts to Any Control Signal
    • Activation from Logic Circuits
    • DPDT Switching Relay
    • Open-Collector Switching
    • Control from Switch, Button, or Logic Circuits

  • ST-LCR3

    Logic Controlled Relay - Dual Alternate Pulse

    • Pulse at the Start of a Logic Signal
    • Pulse at the End of a Logic Signal
    • Relay Contact and Open-Collector Pulse
    • Active High or Active Low Inputs
    • Input Control Voltage From 3.3 to 24 Vdc
    • Control from Switch, Pushbutton, or Logic Circuits

  • ST-LEQ1

    Loudness Equalizer - Use with VCA

    • Loudness Contour to Follow Volume
    • Improved Aural Flatness at Low Levels
    • Installer-Defined Loudness Equalization
    • Automatic Loudness Equalization when used with any RDL® VCA Remote

  • ST-MA2

    2 W Mono Audio Amplifier with Muting - 8 Ω

    • Single-Speaker Monitor Amplifier
    • Conferencing Monitor Amp
    • Monitor Amp with Muting and Externally Actuated Attenuation Steps
    • Fast, Silent Audio Switching
    • Multiple Control Inputs
    • Adjustable Gain

  • ST-MPA24

    Dual Microphone Phantom Adapter - 24 V Adjustable

    • Add Phantom Powered Mics to Standard Inputs
    • Two Phantom Adapters in One Module
    • P24 per IEC 61938
    • Phantom Conversion with Full Frequency Response
    • Phantom Voltage Adjustable Up to IEC Standard 24 Vdc
    • Highly-Filtered Phantom Power

  • ST-MPA48

    Dual Microphone Phantom Adapter - 48 V

      • Phantom Adapter for Two Mics
      • 48 Vdc Fixed Phantom Voltage
      • P48 per IEC 61938
      • Operates From External 12 V Battery or 24 V Power Supply
      • Phantom Conversion with Full Frequency Response
  • Two Channel Audio Mixer

    ST-MX2

    2 Channel Audio Mixer - Microphone or line input and output

    • Two Input Audio Mixer
    • Selectable Mic or Line Level Inputs
    • Simultaneous Mic and Line Outputs
    • Add Additional Inputs to an Existing Mixer
    • Audio Output Dual-LED VU Metering
    • Balanced or Unbalanced Inputs and Outputs
    • Low-Noise and Low-Distortion Performance

  • ST-MX3

    3 Channel Audio Mixer - Line input and output

    • Mix Line-Level Signals
    • Three Individually Adjustable Inputs
    • Add Additional Line Level Inputs to an Existing Mixer
    • Combine Signals of Different Level, Impedance or Balanced /Unbalanced Configuration
    • Isolation Between Input Signals
    • Low-Noise and Low-Distortion Performance
    • RDL® SupplyFlex™ Power Input Configuration
  • White and pink noise generator

    ST-NG1

    White and Pink Noise Generator

    • Random Noise Source
    • Masking Noise Sources
    • Pink Noise
    • White Noise
    • Mic and/or Line Level Noise Signals

  • ST-OSC2A

    Audio Oscillator - 1kHz and 10 kHz

    • Precision Sine-Wave Audio Signal
    • Amplitude-Stable Oscillator
    • Two Single-Tone Oscillators
    • 1 kHz and 10 kHz
    • Precise User-Adjustable Levels
    • Each Oscillator Has Two Separate Outputs
    • RDL SupplyFlex Power Input Configuration

  • ST-OSC2B

    Audio Oscillator - 100 Hz and 400 Hz

    • Precision Sine-Wave Audio Signal
    • Amplitude-Stable Oscillator
    • Two Single-Tone Oscillators
    • Precise User-Adjustable Levels
    • Each Oscillator Has Two Separate Outputs
    • 100 Hz and 400 Hz
    • RDL® SupplyFlex™ Power Input Configuration
  • Mono 18W Amplifier

    ST-PA18

    18 W Mono Audio Amplifier - 8 Ω

      • 18 Watts RMS Audio Power Amplifier
      • Output for 8 Ω Speaker
      • Maximized Audio Level at Full Power Output
      • Superior Audio Quality at High Output Levels
      • Line Level Balanced or Unbalanced Input
      • LOOP OUT to Feed Additional Amplifiers
      • Integral Audio Compressor to Control Clipping
      • High Overall Audio Operating Level
      • LED to Indicate Audio Compression
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