API Audio 550b Discrete 4 Band EQ
API Audio 550b Discrete 4 Band EQ, Discrete 4-band equalizer, From the 500 series, 7 centre frequencies selectable per band, 12 dB of boost / cut per band, EQ band 1 and 4 in selectable shelf / peak characteristics, Traditional API circuit design, Headroom up to +30 dB, In / Out switch, Reissue of the 1967 API 550EQ with an additional band, Requires the API Lunchbox 500-6B or 500 VPR slot rack