500 Series Processors

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 the flexibility to bring along specialized EQ effects to any situation: 550A, 550B or 560

RPQ2 preamp in 500 series form

500 Series Mic/Line Preamp/DI with Discrete Transformer-balanced Amplifiers and Summing - Based on the EMI TG12428

Class-A Reamp with two isolated outputs & adjustable level controls

500-series compatible Germanium preamp.

Equalization Lunchbox Module

FET Compressor Lunchbox Module with Sidechain Filter

Little Devil 500 Series Preamp

500 series version of RNLA7239 Really Nice Leveling Amplifier

blank rack panel for 500 series

The 32EQ is a new 500-series version of the EQ and filters from the renowned Harrison 32 Series consoles.

professional quality microphone preamplifier designed to re-create the vintage sound characteristics of the early 1970s large consoles.

Artistic Mic Pre - Mono Mic Pre 500 Series

500 series Replica of Neve 1073 Single-channel Microphone Preamp/Equalizer

single channel, 500 series preamp and features and instrument DI

500 Series HV-3 Preamp Module.  Will work in any API-compatible rack.

Bento 6 - Enclosure for six Fredenstein Series 600 or 500 series modules

500 series Replica of Neve 1073 Single-channel Microphone Preamp/Equalizer

single-channel, 500 Series microphone preamplifier

F609 - Mono Tube Microphone preamplifier Module

Designed by the now legendary Saul Walker in the late 60's, the discrete 550A was first used as a modular OEM equalizer.

F601A - Mono Microphone preamplifier Module

Pre573 MK2 plus - 1073 style Microphone Preamp for 500 Series

The xfilter 500 is a true linked stereo EQ in the 500 series format

dbx 580 Microphone Preamp is the perfect partner to your microphones

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 the flexibility to bring along specialized EQ effects to any situation: 550A, 550B or 560

Based on the API 500 series form factor, the Burl Audio B1 was designed to compliment the B2 Bomber ADC, and give you multi-channel pleasure

500 series DISCRETE Parametric Equalizer, Tonelux

Artistic FET Compressor - Mono Compressor 500 Series

Bento 10 - Enclosure for ten Fredenstein Series 600 or 500 series modules

Bento 10 - High Performance Enclosure for ten Fredenstein Series 600 or 500 series modules

Bento 2 - Enclosure for two Fredenstein Series 600 or 500 series modules

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Bento 6D - High Performanc Enclosure for six Fredenstein Series 600 or 500 series modules

F600A - Mono Compressor Module

F602 - Mono Tube Compressor Module

F603A - Mono High-Q four band Equalizer (Q=2) Module

F603B - Mono Low-Q four band Equalizer (Q=0.8) Module