Transformer balanced mic preamp

500 Series PhotoOptical Compressor.

500 Series Mic Preamp

500 Series EQ with Four Bands.

500 Series 3-band Parametric Equalizer, with Switchable Peak/Shelf Curves for Low and...

500 Series Subharmonic Synthesizer, with 2 Subharmonic Frequency Bands and LED Metering

MicPre with DI

Neve-style EQ

The EQP5 is a premium tone-shaping EQ based on the prized Pultec EQP filter circuitry.

Workhorse single space blank panel.

overdrive

line level distortion

3 in 1 stereo, dual mono, m/s compressor with digital recall and automation

FET Compressor

Vari Mu Comp

The Impulse Shaper

Colour Palette 500-Series MK2 Kit

Transient Designer 500 Series module

500 Series Dual-channel Multi-frequency-band Optical Compressor with Independent...

500 Series 3-band Parametric Equalizer, with Switchable Peak/Shelf Curves for Low and...

The 500 Series version of Golden Age Project's Neve 1073 preamp clone.

Modeled after API's highly prized console-based 325 booster cards, the 535 can both...

Parametric Equalizer

Vacuum Tube Optical Compressor Module

FET Compressor Module

Easy to use, this utility piece allows you to take wet and dry into the API 500...

Insert Station; Active DI-box; Reamp Tool; Multi-tool on Stage

500 Series Microphone Preamp

Preamp for 500 Series

Classic Four-band Parametric Equalizer

The Coloring Box

Opto Tube Comp

Opamp based Mic Preamp

All-discrete 8-channel Summing Amp for the Purple Audio Sweet Ten 500 Series Rack

Four opamp, differential mic preamp.

Two stage API console channel with high and low pass filters