bossarea-boss-pq-4-parametric-equalizerBoss PQ-4 Parametric Equalizer

THE PQ-4 has over time become quite rare. It was never a big seller and as Boss presently doesn’t make any parametric equalizers, they are highly sougth after. You can adjust Presence, Low Level boost or cut, Mid Frequency range between 100Hz and 1.6 KHZ , and a High Frequency range between 500HZ and 8KHZ. Each frequency range selector has it’s own individual levels for boosting or cutting specific frequencies, plus it has a -18 to +18 over all level boost or cut.


  • Controls: Presence/Low, Middle, High, Level
  • Connectors: Input, Output, AC Adaptor
  • Current Draw: 23mA
  • Weight: 410g
  • Input Impedance: 1 Mohm
  • Output Impedance: 1 kohm
  • Residual Noise Level: less than -98dBm (IHF-A)
  • Recommended Load Impedance: More than 10kOhm
  • Recommended AC Adaptor: PSA Series


  • Silver – Made In Taiwan

The PQ-4 was sold from March 1991 to November 1997.

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