API 550B 4-Band EQ 500 Series Module (Pre-Loved)

Description

The API 550B takes the classic tone of the original 550A and expands its flexibility with four bands of fully discrete, proportional-Q equalization. Designed by API founder Saul Walker, the 550B is a staple in high-end recording and mixing environments thanks to its musical curves, fast workflow, and unmistakably punchy midrange. This pre-loved 500 Series module captures that iconic sound in a compact and rugged format, ideal for tracking and mixing alike.

With seven selectable frequencies per band, the 550B offers detailed tonal shaping across the spectrum. Its proportional-Q design ensures that changes remain musical even with aggressive boosts or cuts, while the switchable shelf options on the high and low bands make it adaptable to any source. Whether you’re sculpting vocals, drums, guitars, or the stereo buss, the 550B delivers results that sound finished straight out of the box.