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Shape Without Compromise
A revival of the first Darkglass design, the Harmonic Booster is a clean bass preamp that aims to master the control of harmonics and filtering, which are crucial to sculpting the character and texture of a bass tone.

  • Clean preamplifier that enhances attack and presence
  • Comprehensive 3-band active EQ
  • Unique tone-shaping engine controlled with Character knob
  • Semi-parametric Mid control
  • Designed to perfectly complement Darkglass distortion circuits

Clean Bass Preamp.

The Harmonic Booster is derived from the first few gain and filter stages of what would later become the core of the Darkglass overdrive technology. This clean preamp enhances attack and presence while sculpting the mids for a very percussive and aggressive character. It features a unique tone-shaping Character control, as well as a 3-band active EQ with a semi-parametric mid control

Specs

  • BoostFlat -20dB to +20dB cut or boost.
  • Treble+-20dB @ 5 kHz
  • DimensionsWidth: 75 mm / 3″
    Length: 111 mm/ 4¼″
    Height: 43 mm / 1¾″
    Weight: 250 g / 0.55 lb
  • CharacterAllows blending in the perfect amount of the tone-shaping circuitry. It can be set counter-clockwise for a flatter frequency response.
  • OutputConnect from the ¼” Output jack to the input of your amplifier or another effects pedal.
  • WarningThe Harmonic Booster has a current draw of 30mA. Only use a regulated 9V DC adapter with a center-negative plug.

    Unregulated power supplies and/or higher voltages may result in suboptimal noise performance and even damage your unit, voiding the warranty

  • Mid gain+-20dB @ the frequency selected by “Mid Frequency”.
  • InputConnect your instrument or output from your pedal board to the ¼” mono jack.
  • Mid FrequencyMid frequency from 250Hz to 2.5kHz.
  • 9V DCOnly use a regulated 9V DC adapter with a center-negative plug.
  • Bass+-20dB @ 80 Hz.