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The PQ-3B is a three-band bass parametric equalizer that features Low, Middle and High bands. Each band allows you to set the frequency and level. The level can be boosted or cut with 18dB which is the highest of any Boss pedal. The low band ranges from 25Hz to 400Hz, the middle band from 160Hz to 2.5kHz while the high band covers 1kHz to 16kHz. The level control is placed before the filters and can be used to correct the volume difference between the effect and straight sounds.

Boss PQ-3B Bass Parametric Equalizer


  • Controls: Low Level, Low Frequency, Middle Level, Middle Frequency, High Level, High Frequency, Level
  • Connectors: Input, Output, AC Adaptor
  • Current Draw: 25 mA (DC 9V)
  • Weight: 410g (15 oz.)
  • Input Impedance: 1Mohm
  • Output Impedance: 1kohm
  • Residual Noise Level: -98 dBm or less(IHF-A) (all controls: center) 0 dBm = 0.775 V
  • Recommended Load Impedance: 10kOhm or greater
  • Recommended AC Adaptor: PSA Series


  • Silver – Made In Taiwan

The PQ-3B was sold from March 1991 to December 1995.