Completely accurate recreation of the E.M.I. REDD desk 'POP EQ' and RS127 presence filter circuits in one modern rack-mount unit. Made from original schematics and me personally reverse-engineering ex-Abbey Road REDD/RS hardware. Features amazing sounding hand-wound inductors, made from the materials and to the high tolerances specified in original documents.Users universally describe this equalizer combo as THE "missing link" in their '60s signal chain. Neumann mics and Telefunken amps get you 90% there. This EQ is the last 10%. Virtually unattainable before now. The desk equaliser and Presence Filter each have -10dB insertion loss, as the originals did. 200 ohm.