- 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
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) | | Power Requirement: | GROUND-REFERENCED or FLOATING, 24 to 33 Vdc @ 50 mA | | Ambient Operating Environment: | 0° C to 55° C |
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