---
product_id: 48519129
title: "MXR M103 Blue Box™ Octave Fuzz"
brand: "mxr"
price: "Bs.3339"
currency: BOB
in_stock: true
reviews_count: 6
category: "Mxr"
url: https://www.desertcart.bo/products/48519129-mxr-m103-blue-box-octave-fuzz
store_origin: BO
region: Bolivia
---

# Powered by 9V battery or adapter Octave fuzz two octaves down Massive low-frequency output MXR M103 Blue Box™ Octave Fuzz

**Brand:** mxr
**Price:** Bs.3339
**Availability:** ✅ In Stock

## Summary

> 🎸 Unleash the beastly fuzz that makes your guitar roar like never before!

## Quick Answers

- **What is this?** MXR M103 Blue Box™ Octave Fuzz by mxr
- **How much does it cost?** Bs.3339 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/48519129-mxr-m103-blue-box-octave-fuzz)

## Best For

- mxr enthusiasts

## Why This Product

- Trusted mxr brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual Octave Magic:** Transforms your guitar signal with thick fuzz and two octaves down for a signature growl.
- • **Chaos Meets Creativity:** Each playthrough delivers a uniquely wild, fuzzed-out sonic adventure.
- • **Monstrous Low-End Power:** Shovels out deep bass tones that command attention in any mix.
- • **Versatile Power Options:** Runs on a single 9V battery or Dunlop’s ECB-003 adapter for gig-ready reliability.
- • **Perfect for Experimental Pros:** Ideal for players craving character and texture over pristine tone.

## Overview

The MXR M103 Blue Box™ Octave Fuzz is a rugged metal-bodied analog effects pedal that delivers thick, chaotic fuzz combined with two octaves down for a uniquely monstrous tone. Powered by a 9V battery or optional adapter, it’s designed for guitarists seeking deep low-end presence and unpredictable sonic character, perfect for experimental and lead tones that stand out in any session.

## Description

Free delivery and returns on eligible orders of £20 or more. Buy MXR M103 Blue Box™ Octave Fuzz at desertcart UK.

Review: Fuzzy and messy and brilliant - thick fuzz sounds, great when combined with other effects. The one thing this pedal has stacks of, is character, it sounds warm and it crackles and spits when trying to track notes. It tracks very well when playing about the 11th fret though. Reacts differently to different pickups. Unique and fun to play with IF you like noise. Not one for pure tone hunters.
Review: Love it! Does everything I wanted it to do. Deep and unique octave and fuzz tone. It does not cut volume. 75% is unity volume. Beyond that, it will start driving your amp, which is cool too. Because of the low frequency bass, it does EQ your signal in a way which may not punch through a mix as easily. My fix for that is to put it in front of a phase shifter. With an MXR Phase 100 it will chew its way through a mix quite easily. To improve tracking, use your bridge pickup and turn its tone control down all the way. For further improvement, use a compressor in front of it. Keeping a consistent input level smooths out the tracking and noise. If you need perfect polyphonic octave tracking, get a HOG or a POG. This a unique sound all its own that will give you a monsterous lead tone if you treat it right.

## Features

- Shovels out enough low frequencies to scare a blue whale
- Takes your guitar signal, fuzzes it up, then duplicates it two octaves down
- Known for having a chaotic personality that can make each session a totally unique experience
- Powered by a single 9 volt battery or Dunlop's ECB-003 AC adapter (sold separately)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002GY9Y0 |
| Best Sellers Rank | 60,308 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 14,823 in Recording & Computer |
| Body Material | Metal |
| Colour | Blue |
| Connector | 1/4 inch audio jack |
| Customer Reviews | 4.4 4.4 out of 5 stars (100) |
| Date First Available | 2 Dec. 2008 |
| Hardware Interface | 1/4-inch Audio |
| Item Weight | 227 g |
| Item model number | 11103000001 |
| Material Type | Metal |
| Power Source | Works with a DC power supply |
| Signal Format | Analog |
| Voltage | 9 Volts |

## Product Details

- **Brand:** MXR
- **Colour:** Blue
- **Item weight:** 0.5 Pounds
- **Style:** Compact
- **Voltage:** 9 Volts

## Images

![MXR M103 Blue Box™ Octave Fuzz - Image 1](https://m.media-amazon.com/images/I/61K2j-w3kUL.jpg)
![MXR M103 Blue Box™ Octave Fuzz - Image 2](https://m.media-amazon.com/images/I/61T43fWjCoL.jpg)
![MXR M103 Blue Box™ Octave Fuzz - Image 3](https://m.media-amazon.com/images/I/81svcLP1laL.jpg)
![MXR M103 Blue Box™ Octave Fuzz - Image 4](https://m.media-amazon.com/images/I/81xCx-c13tL.jpg)

## Questions & Answers

**Q: would this work for a 'sensitive' instrument like a 'piezo pickup' lap harp?...thanks**
A: It'll work, but it's simply on or off type sound. It doesn't respond to playing quietly very well, it sounds like it has a noise gate that kicks in when you pick harder. If you want full on octave fuzz then it will do the trick. But not for dynamic playing such as a fuzz face.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fuzzy and messy and brilliant
*by J***. on 13 September 2010*

thick fuzz sounds, great when combined with other effects. The one thing this pedal has stacks of, is character, it sounds warm and it crackles and spits when trying to track notes. It tracks very well when playing about the 11th fret though. Reacts differently to different pickups. Unique and fun to play with IF you like noise. Not one for pure tone hunters.

### ⭐⭐⭐⭐⭐ Review
*by D***G on 30 April 2025*

Love it! Does everything I wanted it to do. Deep and unique octave and fuzz tone. It does not cut volume. 75% is unity volume. Beyond that, it will start driving your amp, which is cool too. Because of the low frequency bass, it does EQ your signal in a way which may not punch through a mix as easily. My fix for that is to put it in front of a phase shifter. With an MXR Phase 100 it will chew its way through a mix quite easily. To improve tracking, use your bridge pickup and turn its tone control down all the way. For further improvement, use a compressor in front of it. Keeping a consistent input level smooths out the tracking and noise. If you need perfect polyphonic octave tracking, get a HOG or a POG. This a unique sound all its own that will give you a monsterous lead tone if you treat it right.

### ⭐⭐⭐⭐⭐ Review
*by C***P on 13 December 2015*

Great delivery. Product functions as it should.

## Frequently Bought Together

- MXR M103 Blue Box™ Octave Fuzz
- MXR Duke of Tone Overdrive

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-02-01*