Stone Deaf PDF-2 Parametric Overdrive Parametric EQ with adjustable distortion gain (Players can dial in full tonal spectrum of their amplifier tone.) Frequency response from 35Hz-6kHz (Players can dial in full tonal spectrum of their amplifier tone.) Lower noise floor than the PDF-1 (as per customer request) (Quieter than PDF-1) 9v Power supply centre negative (Low power consumption) Footswitchable Dual Channel, Clean and Dirty parametric EQ (as per customer feedback)(Foot switchable Clean Channel or Distorted Channel)