$207.46

RDL STA-2A Dual High Gain Line Amplifiers

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.

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

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