500 + 200 Series

Saul Walker designed the 500 Series as a modular expansion system for API recording consoles, allowing engineers to easily swap out different processing modules like preamps, EQs, and compressors.

Over time, it evolved into an industry standard, with many other manufacturers creating 500 Series-compatible modules. API’s early 500 Series modules, such as the API 512c preamp and 550A EQ, are still highly regarded in the audio industry today.

Whether in 500 Series, recording consoles, or rackmount formats, all API circuitry is identical. Contrast this to many other manufacturers, who typically resort to inconsistent voltages depending on format.

Because API’s equipment was designed from day one to require lower voltage, its compressors, microphone preamps, and equalizers don’t need to be modified or compromised.

This means whether you’re using an API recording console, rackmount unit, or a 500 Series module, you’ll hear the same clear, punchy character that’s been crowned as the quintessential American tone.

Saul Walker designed the 500 Series as a modular expansion system for API recording consoles, allowing engineers to easily swap out different processing modules like preamps, EQs, and compressors.

Over time, it evolved into an industry standard, with many other manufacturers creating 500 Series-compatible modules. API’s early 500 Series modules, such as the API 512c preamp and 550A EQ, are still highly regarded in the audio industry today.

Unlike many other manufacturers, API’s discrete microphone preamp, compression, and equalization circuitry is identical in 500 Series, recording consoles, and rackmount formats.