The latest incarnation of our very first design, the parametric distortion filter – otherwise known as the PDF-2 is the infamous sibling of our very own PDF-1.

The PDF-2 has more gain on tap than it’s popular predecessor, an added expression pedal input and dual channel operation, the PDF-2 has garnered a fearsome reputation as a versatile beast in its own right.
With a reduced noise floor, adjustable gain knob and dual footswitch for clean and dirty channels, the PDF-2 delivers unmatched versatility, having been used on instruments including piano, bass, drums, synths, and both electric and acoustic guitars, it also boasts an expression pedal input control* feature for wah, phaser and manual tonal shifts.
Offering an effective EQ and a bombproof enclosure, this drive pedal is considered to be one of the most formidable on the market for even the hardest touring musician.

  • Features compatible with the Stone Deaf EP-1 Expression Pedal only


  • Parametric EQ with adjustable distortion gain
  • Frequency response from 35Hz-6kHz. (For Bass & Guitar)
  • Adjustable Gain allowing you to increase or deacrease the gain. (For PDF-1 gain you need to roll back the gain knob to about 7 or 8 o’clock to achieve this.
  • Lower noise floor than the PDF-1 (as per customer request) (Quieter than PDF-1)
  • Frequency sweep control via expression pedal: Wah Wah function via expression using boost in thin setting, Phaser function via expression using cut in thin setting, Tone con trol function via expression using medium to fat bandwidth setting.
  • 9v Power supply centre negative 2.1mm Boss Style (use isolated power supply to reduce noise) Current Draw is 35mA
  • Footswitchable Dual Channel, Clean and Dirty parametric EQ channel
  • Hand Built in Manchester, United Kingdom

Please note if you are trying to match volume to other pedals you need to experiment with the bandwidth Q, Height (Boost / Cut) and Frequency as this all works in conjunction with the pedals overall volume. There is an overall volume compensation circuit built into the height function of the pedal.


Stone Deaf Effects and Amplification LTD
35 Pennine Vale
Shaw, Oldham
United Kingdom

Note: This Instruction Manual is adapted from the official manual created by Stone Deaf FX in PDF format, without modification of the content. We just rewrite the PDF, into responsive mobile friendly pages.So, you can read this document anytime and anywhere.

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