Mint, like new, used it for a couple hours in my clean and smoke free home studio. Ultimate quality and huge dynamic range! The Trident S20 Dual Mic Preamp has an input selector that switches between mic and line or 2 mics, a great feature for instantly comparing which mic is really the best for a particular job. Switch reverses the phase of the input signal. 48V phantom power for condenser mics. Gain swing ranges from a true unity to +60dB without any pad. Variable-sweep, low-cut filter controls lows from 5Hz-200Hz that can muddy a mike. It removes stage and floor rumble, takes out subsonic interference, and improves the HF performance of the signal by the elimination of LF intermodulation distortions. FEATURES Input selector switches between mic and line or 2 mics Phase reverse the input signal with one switch +48V phantom power for condenser mikes Gain swing of the pre is from true unity to +60dB without any pad After the pre, the variable sweep low-cut filter controls lows that can muddy a mike easily