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API 312 - 500-Series Mic Pre Module The API 312 is 500 series adaptation of API's original 312 microphone pre-amp. The 312's design is based on Sa...

API 312 - 500-Series Mic Pre Module - B-Stock The API 312 is 500 series adaptation of API's original 312 microphone pre-amp. The 312's design is ba...

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...

API 500-6B The API Model 500-6B Lunchbox is a six position rack designed to accept all API standard 5.25" X 1.5" modules. This allows an engineer t...

API 500VPR - 10 Slot Rack + L200PS PSU The API 500VPR is a rugged 10-slot, 3U rackmountable chassis for your modular 500 series gear. Powered by a ...

API 505 DI - Discrete DI - 500-Series Module The API 505 DI is a 500-series direct input module. The 505 DI is designed specifically for guitar, ba...

API 512V The API 512v is a preamp for mic, line and instrument feeds, world famous for its ability to provide a low noise (-129 EIN) and unusually ...

API 525 Originally released in the 70's, the API 525 is a "feedback" type compressor, such as the 1176 and 660, etc. An input (threshold) control a...

API 525A Mono Compressor - 500-Series Module Since the early 1970s and the subsequent re-issue over 20 years ago, the 525 Discrete Compressor has b...

API 527A - Compressor / Limiter - 500-Series Module The API 527A is mono VCA based compressor limiter designed in the 500 series format. The 527A f...

API 529 The API 529 is a 500-Series (2 slot) stereo compressor module that combines the convenience and popularity of the 500 Series format API's c...

API 529 Stereo Compressor 500-Series Module - B-Stock ---This unit has been unboxed and on display in our showroom. As new with full warranty. The ...

API 535-LA The API 535-LA is a line amplifier that includes a balanced input, a polarity switch, a 20dB pad for incoming signal attenuation and a t...

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 5B1 Blank Panel This is a blank 500 series blanking panel that helps protect the internal connectors of unused slots in your 500 series lunchbox.

API Lunchbox 8HC - 8 Slot Portable 500-Series rack with external Power Supply The API Lunchbox 8HC is an 8-slot 500-series chassis with DB25 connec...