Overview
The STA-2A is a dual-channel, line-level audio preamplifier. Each channel is identical. The audio inputs are bridged at 20 k? 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 ? 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 ? 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
Specifications
| Amps per STA-2A | 2 identical circuits (stereo or dual mono operation) |
| Inputs (2) | 20 k? balanced or unbalanced |
| Input Signal (for +4 dBu out) | -20 dBu (-18 dBV) to +18 dBu |
| Maximum Input Level | +24 dBu |
| Outputs (2) | 150 ? balanced or 75 ? 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 |
| Package Dimensions | 2 x 2 x 4 in. |
| Shipping Weight | 0.2 lbs. |
| WEEE weight | 0.145 lbs. |
| Tariff code | 8518.40.2000 |