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API 500 Series 550A - 3 Band Equalizer Few equalizers enjoy the respect and admiration of the coveted API 550A. Designed by the now legendary Saul ...

The API 550 EQ played a major part in the history of music recording in the USA during the 60's and 70's. Originally conceived for use in API's con...

The lineage of the 5500 circuit can be traced back to the original 550 equalizer designed by Saul Walker, the founder of Automated Processes Inc. T...

API 550A - 3 Band EQ - 500-Series Module - B-Stock (Ex-Demo) Few equalizers enjoy the respect and admiration of the coveted API 550A. Designed by t...

API 560 - 10 Band Graphic EQ - 500-Series Module - B-Stock Originally conceived for use in API Consoles of the 60's and 70's, the API 560 re-issue ...

API 565 - Discrete Filter Set - 500-Series Module The API 565 Filter Bank is a 500-series module featuring sweepable high-pass and low-pass filters...

API Select SR24 - Dual Channel Equalizer The API Select SR24 is a two channel, four band equalizer in a two rack-space chassis. With a dedicated kn...

API Select SV14 - Parametric EQ - 500 Series The API Select SV14 is a four band parametric EQ, re-engineered  from the highly sought-after APSI 562...

API Select TranZformer GTR - EQ, Boost and Overdrive Pedal The API Select TranZformer® GTR incorporates API’s legendary EQ circuit into a versatile...