Darkglass Electronics Harmonic Booster Preamp Pedal

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Clean Preamplifier.

  • Designed to be the perfect complement to our distortion circuits, the flexibility and portability of the Harmonic Booster is also the perfect one-stop solution for gigging musicians in search of a precise and harmonically rich clean preamplifier.



    Flat -20dB to +20dB cut or boost


    Allows blending in the perfect amount of the tone-shaping circuitry. It can be set counter-clockwise for a flatter frequency response

    Mid gain

    +-20dB @ the frequency selected by "Mid Frequency"

    Mid Frequency

    Mid frequency from 250Hz to 2.5kHz


    +-20dB @ 80 Hz


    +-20dB @ 5 kHz


    75x111x43 mm (2.95x4.37x1.77 in)


    The Harmonic Booster has a current draw of 30mA. Only use a regulated 9V DC adapter with a center-negative plug. Due to ecological reasons, it does not accept batteries. Unregulated power supplies and/or higher voltages may result in suboptimal noise performance and even damage your unit, voiding the warranty.