Focusrite Red 4-channel preamp

Description
Focusrite One Quad Mic PreTransistor preamp offering four channels and using the same circuit topology as the original ISA mic pre designs
Mic input gain -6dB to +60dB in 6dB steps
Mic Input Impedance 1200Ω ±15%, balanced and floating
Frequency Response 10Hz to 140kHz (-3dB points), ±0.1dB within passband
Noise (EIN) Distortion -127dBu (input loaded 200Ω) @ 60dB gain
0.15% (-20dBu @ 20Hz) 0.06% (-20dBu @ 40Hz) 0.003% (-20dBu @ 1kHz) 0.005% (-20dBu @ 10kHz)
Output +24dBm into 600Ω +26dBm into 10kΩ, balanced and floating
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