Discrete 500 Series 3 band EQ with an additional filter band and several new frequencies Based on API's original 550 from the late '60s, the API 550b is a continuation of the EQ that played a major... View more
Discrete 500 Series 3 band EQ with API fully discrete circuit design Few equalizers enjoy the respect and admiration of the coveted API 550A. Designed by the now-legendary Saul Walker in the late... View more
Discrete high and low-pass sweep filters in the compact API 200 Series format The API 215L is a unique passive, sweepable filter, designed specifically to contour the sound to preserve the natural... View more
Single channel discrete filter bank for the 500 Series with API 2520 and 2510 Op-Amps The 565 Filter Bank module has circuits that are true to the musical filters of the famed 215 module found in... View more