Browse 500 Series

Discrete compressor with variable attack and release.

Classic API Microphone Preamp design with switchable 3:1 Output Transformer and variable output level control

DI designed specifically to accept guitar, bass, or keyboard signals with unique TONE control

VCA based Compressor/Limiter with API’s patented THRUST® circuit

Original compressor circuit designed for the ATI Paragon Console with API’s patented THRUST®...

Exact reissue of API’s original 525 “Feedback” type compressor released in the early 70s

VCA based compressor/limiter

API’s Classic 312 Microphone Preamp in a 500 Series module

Line Amplifier modeled after API’s highly prized console-based 325 booster cards

Classic API Microphone Preamp design in 500 series format

4-band Parametric EQ based on the classic APSI 562 EQ

Filter Bank module based on the 215 module found in large format API consoles