RDL STA-1 Dual Balanced/Unbalanced Line Amplifier

Dual Balanced/Unbalanced Line Amplifier - 12 to 20 dB Gain

The STA-1 is a dual-channel line-level preamplifier with bridging inputs, adjustable gain or loss, and low-impedance outputs. Each of the two identical circuits is both an electronic line transformer and a line amplifier. Hook up the STA-1 just like a pair of audio transformers with gain. True dc amplifiers produce unsurpassed audio clarity, high common-mode rejection, ultra-low distortion and low noise. The STA-1 is perfect for most line amplification, impedance or balanced/unbalanced conversion.

The STA-1 operates from floating or bipolar dc power. For installations where ground-referenced power is preferred, use the STA-2A Dual High Gain Line Amplifiers.

Features:

• Up to 20 dB Gain in an Audio Line
• Conversion from Balanced to Unbalanced
• Conversion from Unbalanced to Balanced
• Conversion from High to Low Impedance
• Conversion from Low to High Impedance
• Bridge an Audio Line Feed
• Precisely Match Audio Levels

Specifications:

• Amps per STA-1: 2 identical circuits (stereo or dual mono operation)
• Gain: 20 dB (adjustable, separate controls for each channel)
• Input Impedance: 10 kΩ bridging
• Input Configuration: Balanced or unbalanced
• Output Impedance: 200 Ω balanced (drives 600 Ω or 10 kΩ lines)
• Output Configuration: Balanced or unbalanced
• Frequency Response: dc to 25 kHz (+/- 0.25 dB)
• THD+N: 0.003% to 0.009%; (0.005% nominal)
• Output Level: +4 dBu
• Headroom: 18 dB (at rated output of +4 dBu)
• Noise: -80 to -85 dB (referred to +4 dBu);
• -98 to -103 dB (referred to +22 dBu)
• CMRR: -70 dB to -80 dB (100 Hz)
• Crosstalk: Better than 75 dB
• Power Requirement: FLOATING, 24 Vdc @ 50 mA
• Ambient Operating Environment:0 C to 55 C