The AQ550b is inspired by the classic American equalizer from the late 1960s, a device that has left a lasting impact on music recording history. This version enhances the original design by adding an extra filter band and expanding the available frequency options, offering a broad spectrum of tonal possibilities. Its carefully selected controls ensure a straightforward user experience while delivering professional-grade audio shaping capabilities.

Equipped with four overlapping EQ bands, each featuring seven switchable frequency centers, the AQ550b provides precise control across multiple octaves. The ability to switch between shelf and peak modes on the first and fourth bands adds further flexibility, while the Proportional Q feature intelligently adjusts filter bandwidth to maintain sonic clarity and reduce phase distortion. Users can also select between stereo, mid, and side equalization modes, adapting the tool to various mixing scenarios.

Blending the warmth and character of analog processing with the precision of digital technology, the AQ550b allows users to toggle analog saturation on or off, depending on the desired sound. Its streamlined interface avoids unnecessary complexity, focusing on essential functions that facilitate both corrective and creative equalization. This makes the AQ550b a valuable asset for audio professionals seeking classic tone with modern flexibility.