browse 500 Series

Discrete compressor with variable attack and release.

3 bands of classic API equalization

Special Edition 10-band Graphic EQ based on the original API 560 EQ

Limited Edition 312 Microphone Preamp based on the original 1970’s 312 PCB Design

Limited Edition 3-band EQ based off the legendary 1971 550A

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

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

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

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

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

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

Stereo Compressor based on the famous API 2500 Stereo Bus Compressor in 500 Series format