API 550B

EQ
Waves

A vintage-modeled 4-band parametric equalizer based on the legendary API 550B design from the late 1960s, featuring proportional Q technology that intelligently adjusts filter bandwidth based on gain settings for smooth, musical sound even at extreme boost/cut levels. The 550B provides 7 switchable filter frequencies per band spanning up to 5 octaves, delivering the hallmark warm, transparent tone that defined high-end studio recording for decades.

Key Features

  • Four overlapping EQ bands with 7 switchable filter frequencies per band
  • Proportional Q automatically widens bandwidth at lower settings and narrows at higher settings
  • Switchable shelf/bell filter types on low and high bands
  • Low and low-mid bands with frequency range from 30Hz to 1kHz
  • High-mid and high bands covering 0.8kHz to 20kHz
  • ±12dB gain range in 2-3dB steps per band
  • Analog modeling toggle for enhanced vintage character
  • 180-degree phase/polarity inversion control
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