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MXR M84 Bass Fuzz Deluxe

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MXR M84 Bass Fuzz Deluxe

Bass Harmonic Fuzz Distortion Effects Pedal

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Product Description for the MXR M84 Bass Fuzz Deluxe

The Bass Fuzz Deluxe delivers huge fuzz tones without sacrificing original signal's punch & clarity thanks to separate Dry & Wet level controls.

To create the MXR Bass Fuzz Deluxe, we dug up a rare vintage fuzz and modified it for the modern bassist. The resulting stompbox delivers a cutting and bold fuzz tone without degrading the punch and clarity of your original signal.

With separate Dry and Wet level controls, the Bass Fuzz Deluxe sounds like you're running two different amps. Blend to taste, from subtle hairiness to full on raging fuzz, with Fuzz and Tone controls affecting only the Wet signal. The Bass Fuzz Deluxe features true hardwire bypass.



  • Based on a rare vintage fuzz circuit but modified for the modern bassist
  • Tone control affects only the fuzz signal, leaving your direct signal clean and clear
  • Separate Dry and Fuzz controls for tonal versatility
  • Delivers a bold and cutting fuzz tone while retaining clarity and punch
  • Analog circuitry for rich organic tone


The MXR Bass Fuzz Deluxe can be powered by one 9 volt battery, a Dunlop ECB003 9 volt AC adapter (ECB003E in Europe), or a Dunlop DCB10 DC Brick power supply


  • Run a cable from your bass to the Bass Fuzz Deluxe’s Input jack and run another cable from the Bass Fuzz Deluxe’s Output jack to your amplifier.
  • Set all controls to the 12 o’clock position.
  • Turn the effect on by depressing the footswitch.
  • Turn the Dry control clockwise to increase the amount of the direct signal or counter-clockwise to decrease it.
  • Turn the Wet control clockwise to increase the amount of fuzz signal or counter-clockwise to decrease it.
  • Turn the Tone control clockwise for a brighter sound; counterclockwise for a darker sound.
  • Turn the Fuzz control clockwise to increase the amount of fuzz or counter-clockwise to decrease it.


  • Input Impedance : 1 MΩ
  • Output Impedance : 100 Ω
  • Signal to Noise : 90 dBV
  • Fuzz Gain Range : 40 dB
  • Dry Max Gain : +6 dB
  • Bypass : True Hardwire
  • Current Draw : 11 mA
  • Power Supply : 9 volts DC


  • DRY Controls the direct signal output level
  • WET Controls the fuzz signal output level
  • TONE Controls the color of the fuzz signal only
  • FUZZ Controls the amount of fuzz
  • Footswitch toggles effect on/ bypass (White LED indicates on)
Brand MXR
Weight 0.8400
Dimensions (WxHxD) 5.5 x 4.4 x 2.6


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