Rupert Neve Designs 551 Inductor EQ; 3-band inductor eq (500 series); low eq: +/- 15db shelf or peak, selectable for 35hz, 60hz, 100hz or 220hz; mid eq: +/- 15db with 6 center frequencies: 200hz, 350hz, 700hz, 1.5khz, 3khz and 6khz; with high; peak switches to amplify the q factor; hishelf: +/- 15db shelf or peak, selectable for 8khz and 16khz; locut: 12db / octave at 80hz; rupert neve custom transformer; Format: API Series 500 Rack