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RDL STA-2A Dual High Gain Line Amplifiers
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    RDL STA-2A Dual High Gain Line Amplifiers

    Manufacturer: Radio Design Labs

    Item #: STA-2A   •   MFG #: STA-2A


    List Price:$214.33
    Our Price:$145.25

    free ship
    Availability: Usually ships in 3-10 business days
    This item is currently out of stock and will ship the minute we receive it – normally 3-10 business days. Need it sooner? Call 800-522-2025 and we'll make it happen,or email Customer Service for expedited delivery options. Certain Non-Stock Items Valued over $50.00 may Ship FREE UPS GROUND in the Continental US. Multiple quantities of the same non-Stock Item Valued below $50.00 may be ordered to meet the $50 minimum order requirement to qualify for Free UPS Ground Freight. This offer does not apply to certain freight-intensive or hazardous items. Certain restrictions may apply.



      Required Accessories

      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.

      Required Power Supply RDL PS24V Sold Separately

      • Features

        • 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
      • Specifications

        • 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)
        • Power Requirement: GROUND‑REFERENCED or FLOATING, 24 Vdc @ 50 mA
        • Ambient Operating Environment: 0° C to 55° C

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