MXR M-103 Blue Box

  • Item # 0097501
  • Model # M103
Top Rated

The MXR Blue Box takes your guitar signal, fuzzes it up, then duplicates it 2 octaves down. You control the output and the mix between the dry signal and the effect. Using it 100% wet is quite an expe… Learn More


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This unassuming little box shovels out enough low frequencies to scare a blue whale.


  • Power: Single 9 volt battery or Dunlop ECB-003 AC adapter
  • Controls: Footswitch toggles effect on/bypass (red LED indicates on)
  • Output knob sets total output gain
  • Blend knob adjusts ratio of dry (clean) with wet (effects) signal