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
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 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 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
