Dual High Gain Line Amplifiers

  • Up to 24 dB Gain in Audio Lines
  • Conversion between Unbalanced and Balanced
  • Conversion between High and Low Impedance
  • Low-Impedance, High-Current Line Drivers
  • Dual-Channel Line-Level Preamplifiers
  • High Gain, High Output, High Performance
  • RDL® SupplyFlex™ Power Input Configuration
  • Recommended Power Supply ( Not Included )
    PS-24AS (USA)PS-24AX (International)


    The STA-2A is a dual-channel, line-level audio preamplifier. Each channel is identical. The audio inputs are bridged at 20 kΩ and accept either an unbalanced or a balanced audio signal. Gain is adjustable from unity to +24 dB using a 25-turn precision audio taper trimming potentiometer. The output line driver circuits are designed to drive long balanced audio lines into 600 Ω loads.

    The STA-2A features wideband circuitry for excellent phase response, low noise, low distortion and exceptional audio clarity. RDL's SupplyFlex power input configuration is included in the STA-2A. The power supply input may be fed from a floating (not ground-referenced) 24 Vdc power source, from a bipolar power supply (+/- 12 Vdc or +/-15 Vdc) or from a ground-referenced 24 Vdc power supply.

    Many audio products provide optimum performance when feeding into a bridging input, but may not provide the output needed to directly drive low-impedance lines terminated with 600 Ω transformers. The STA-2A is specifically designed for such installations, and is also ideal in installations requiring high gain in line-level audio transmission.


    Amps per STA-2A:2 identical circuits (stereo or dual mono operation)
    Inputs (2):20 kΩ balanced or unbalanced
    Input Signal (for +4 dBu out):-20 dBu (-18 dBV) to +18 dBu
    Maximum Input Level:+24 dBu
    Outputs (2):150 Ω balanced or 75 Ω unbalanced

    Output Signal:
      Balanced:+4 dBu nominal
      Unbalanced:6 dB below balanced line level
    Maximum Output Level:+25 dBu
    Frequency Response:10 Hz to 100 kHz (± 0.05 dB)
    THD+N:< 0.004% (unity gain)
    IMD:< 0.005% (unity gain)
    Noise below +4 dBu:< -90 dB (unity gain)
    Crosstalk:< -80 dB (unity gain)
    Headroom:> 20 dB (above +4 dBu)
    Gain:Unity +24 / -14 dB (adjustable)
    CMRR:> 60 dB (50 Hz to 120 Hz)
    Ambient Operating Environment:0° C to 55° C
    Power Requirement:GROUND-REFERENCED or FLOATING, 24 Vdc @ 50 mA
    Package Type:Cardboard Box
    WEEE weight:0.145 lbs.
    Shipping Weight:0.2 lbs.
    Tariff code:8543.70.9860
    Package Dimensions:2 x 2 x 4 in.

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