API 527A 500 Series Compressor

The API 527A is a powerful and flexible 500 series VCA compressor that continues API’s legacy of precision dynamic control found in iconic models like the 225L, 529, and the renowned 2500/2500+ stereo bus compressors. Designed to fit comfortably into any 500 series rack, the 527A offers the same trusted sonic character and control flexibility, making it an ideal tool for mixing, tracking, and mastering.

Equipped with API’s patented THRUST® circuit, the 527A allows for frequency-dependent sidechain control, preserving low-end punch while applying compression — a key to achieving the signature API “in-your-face” dynamic presence. Users can choose between feed-forward or feedback compression modes and select between hard or soft knee curves for tailoring the behavior to any source material.

The front panel features five precision 31-position detented controls for Threshold, Ratio, Attack, Release, and Output, allowing for accurate, repeatable settings ideal for both studio and live applications. A dedicated IN switch activates the compressor circuit, with selectable soft or hard relay bypass to maintain signal integrity. Visual monitoring is handled by a 10-segment gain reduction/output meter and an Overload LED to ensure your levels stay under control.

At the heart of the 527A are API’s discrete 2510 and 2520 op amps, ensuring the same legendary analog tone, clarity, and headroom that API dynamics modules are known for.

Key Features:

• 500 series VCA compressor with classic API tone
• Selectable feed-forward or feedback compression topology
• Hard or soft knee compression options
• Patented THRUST® circuit for frequency-dependent sidechain control
• 31-position detented controls for Threshold, Ratio, Attack, Release, and Output
• 10-segment LED meter switchable between gain reduction and output level
• Overload LED for visual clipping indication
• IN switch with soft and hard relay bypass
• API 2510 and 2520 discrete op amps for high headroom and warmth
• Fits standard 500 series racks

The API 527A brings legendary analog compression into a compact 500 series format, offering unmatched control, tonal shaping, and musical response for engineers who want professional dynamics processing with the unmistakable API sound.