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API 550A Discrete 3 Band EQ

API 550A front

This is a used API 550A Discrete 3 Band EQ. Designed by the legendary Saul Walker in the '60s, the discrete 550A was first used as a modular OEM equalizer. 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.

API 550A Discrete 3 Band EQ

Few equalizers enjoy the respect and admiration of the coveted API 550A.

The 550A provides reciprocal equalization at 21 points in 5 steps of boost to a maximum of 12dB of gain at each point. The fifteen equalization points are divided into three overlapping ranges. The high and low frequency ranges are individually selectable as either peaking or shelving, and a band-pass filter may be independently inserted of all other selected EQ settings.

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
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