Mesa/Boogie graphic equalizer

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Analysis of a Mesa/Boogie Mark IV schematic revealed the following settings for recreating the famous amp's graphic EQ.

Frequencies:

  • 87.61 Hz
  • 371.74 Hz
  • 723.43 Hz
  • 1575.87 Hz
  • 4822.88 Hz

Q:

  • 1.414 (ideal for octave equalizer)
  • 1.3 (actual, due to component values used)