500-Series

The essence is a True Class A Optical Compressor designed to fit the API 500 VPR Series rack frames offering a great feature set in a compact packa...

The elixir preamplifier module is an excellent compliment to the "fatter" sound of many modules now available in the API 500VPR Series format and h...

Burl B1D - 500-Series Mic Pre with Steel Output Transformer The Burl Audio B1D is an all discrete transistor, class-A, direct coupled, capacitor fr...

Avedis MD7 The Avedis MD7 is a professional preamp that addresses the features needed in op-amp based preamps and, more importantly, with a very mu...

Avedis MA5 - 500-Series Class A Mic Pre The Avedis MA5 is a 500 series module size Class A microphone pre-amplifier designed to mimic the character...

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...

A-Designs P-1 - 500-Series Mic Pre Module The A-Design P-1 has the highest fidelity of all the A-Designs Audio 500 preamps, capturing the mojo of i...

A-Designs EM PEQ - Based on Pultec EQP-1A - 500-Series Module The A-Designs EM PEQ is the first and only Pultec-style equaliser in a 500-Series for...