API 225L Compressor – 500 Series Format

The API 225L is a versatile and musical 500 Series compressor module, designed to deliver flexible dynamic control with the unmistakable punch and clarity of API’s classic analog design. Built on API’s rich legacy of high-performance compression circuits, the 225L is ideal for tracking, mixing, or buss duties where precise dynamics shaping is essential.

With a wide control range and intuitive layout, the API 225L offers Threshold settings from -20 dBu to +10 dBu, a fully variable Ratio from 1:1 to infinity, and Release times adjustable from 50 ms to 3 seconds. These parameters make it easy to go from transparent compression to full limiting, all with the signature API character.

To accommodate different musical styles and signal types, the 225L includes selectable compression behavior via the “Old” (feedback) or “New” (feedforward) mode switch — a feature that lets you choose between vintage-style warmth and tighter modern response. The Soft/Hard Knee switch further refines how aggressively compression is applied, giving you greater control over transient response and envelope shaping.

Designed for use in API’s 500 Series racks or compatible systems, the 225L utilizes API’s discrete analog circuitry and is built to the same uncompromising standards found in their flagship consoles and outboard gear.

Key Features:

Fully discrete analog compressor in 500 Series format
Threshold control from -20 dBu to +10 dBu
Variable Ratio from 1:1 to ∞:1
Adjustable Release time from 50 ms to 3 seconds
Selectable “Old” (feedback) or “New” (feedforward) compression modes
Soft/Hard Knee switch for tailored compression behavior
Ideal for vocals, instruments, buses, and more
Classic API tone and build quality
Fits all standard API 500 Series racks

The API 225L delivers professional-grade compression in a compact and flexible package — perfect for engineers seeking classic analog dynamics with modern control in a 500 Series format.