Upon discovering that the Echoplex Preamp paired as well with bass as it does with guitar, the MXR design team set upon developing the Thump Bass Preamp. Using the Echoplex Preamp circuitry as a foundation, the MXR team added a simple yet potent tone-shaping controls so you can dial in the perfect bass sound for the stage and the studio. The MXR Thump Bass Preamp sweetens your tone, boosts your signal, and kicks your groove up through the roof.

The Echoplex Preamp circuit primes your signal with a carefully balanced EQ profile, allowing you to refine your sound via the pedal's tone dials. The Treble and Bass knobs cut or boost frequencies at 8 kHz and 40 Hz respectively. The Mid knob cuts or boosts the midrange as set by the Frequency knob, from 250 Hz to 1 kHz. This range of frequencies was selected to give you maximum flexibility and minimal fuss when refining your bass signal.
  • All the tone-sweetening versatility bass players need in an MXR mini housing
  • Combines the Echoplex Preamp with a three-band EQ and mid-frequency adjustment
  • Punch up a solo, boost your live signal, or sculpt a more aggressive edge onto a passive sound
All pedals - one year parts and labor warranty.

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