500 series format for compatibility with API and other 500 series racks Microphone preamplifier with 0-66dB of gain with switchable 48V phantom power and phase reverse Direct instrument input with 0-30dB of gain (balanced or unbalanced operation) Blend control allows you to blend the mic pre and the DI signal together Vari-phase continuously adjusts the phase of the direct signal only Silk function for enhanced sound Opto compressor section with contiguously variable threshold control (2:1 ratio, attack, and release are fixed) LEDs for signal presence, clipping, and compression indicators Frequency Response: Main Output, no load, -0.2dB at 10Hz -3dB at 160kHz Noise: Measured at Main Output, unweighted, 22Hz-22kHz, Terminated 150 Ohms. With gain at unity better than -100dBu With gain at 66dB better than -62 dBu Equivalent Input Noise better than -128dBu Noise Factor 1.5dB Maximum Output Level: Maximum output from 20Hz-40kHz is +23 dBu Total Harmonic Distortion + Noise: at 1kHz, +20 dBu output: Main Output: Better than 0.001% at 20Hz, +20 dBu output: Main Output: Better than 0.002% Silk Engaged: Better than 0.2% Second harmonic Crosstalk: Measured channel to channel: Better than -90dB at 15kHz Phantom Power: +48 Volts DC +/-1%