Few equalizers enjoy the respect and admiration of the coveted API 550A. Designed by the now-legendary Saul Walker in the late ’60s, the discrete 550A was first used as a modular OEM equalizer. As the industry rapidly embraced the sonic quality of the 550A, it quickly found its way into many custom console designs by Frank DeMedio and other leading engineers. Many of these consoles are still in use today.
Forty years later, the 550A remains the standard against which other EQs are measured, and it has played a major role in the recording industry for decades.
Still copied but never duplicated, the 550A became API’s standard channel module EQ when the company began manufacturing consoles in 1971. With virtually all existing units spoken for, popular demand for this EQ resulted in API finally resuming production in 2004.
API 550A Features:
- 3 bands of classic API equalization
- Each band offers 7 API selected frequency centers
- Reciprocal and repeatable filtering
- Maximum 12 dB of boost/cut per band
- EQ Band 1 and 3 offer shelf/peak switching
- “Proportional Q” narrows filter Q at extremes
- Traditional API fully discrete circuit design
- High headroom +30 dB clip level
- Need a lunchbox API 500-8B or rack API 500VPR.