550A Special Edition

The API 550A Special Edition is a visually distinct version of the industry-standard 550A equalizer, typically released to commemorate a special occasion. While sonically and functionally identical to the classic 550A, this edition features a unique vintage-style faceplate and custom knobs that evoke the look and feel of the very first API modules from the early 1970s. It offers the same legendary "Proportional Q" design and the unmistakable sound of the 2520 op-amp, making it a must-have for audio professionals who value both the historical significance and the unparalleled musicality of API's heritage.

This module provides the exact same powerful, punchy, and warm equalization that has made the 550A a studio staple for over five decades. Its three bands of EQ feature stepped controls for frequency selection and gain, allowing for up to 12dB of boost or cut. The "Proportional Q" design ensures that the EQ remains musical at all settings, automatically widening the bandwidth for gentle shaping and narrowing it for more surgical adjustments. The high and low bands can be switched between peaking and shelving modes, and a separate band-pass filter is also included. The Special Edition is for the discerning engineer looking to own a piece of API history while acquiring one of the most effective and musical EQs ever created.

Features

• Special Edition with vintage-inspired faceplate and knobs.
• Sonically and functionally identical to the standard API 550A.
• Classic 3-band Equalizer with "Proportional Q" circuitry.
• Seven selectable frequency centers on each band.
• Stepped controls offering up to 12dB of boost/cut.
• Switchable Peaking or Shelving curves on high and low bands.
• Independent band-pass filter.
• Features the classic API 2520 discrete op-amp.