MXR M103 Blue Box Octave Fuzz

MXR M103 Blue Box Octave Fuzz

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M103 Blue Box Octave Fuzz, Fuzz pedal from MXR.

8 user reviews
Prices starting at $80 average price: $80

MXR M103 Blue Box Octave Fuzz tech. sheet

  • Manufacturer:MXR
  • Model:M103 Blue Box Octave Fuzz
  • Category:Fuzz pedals
  • Added in our database on: 05/15/2006

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MXR M103 Blue Box Octave Fuzz user reviews

Average Score:4.0( 4/5 based on 8 reviews )
 1 user review13 %
 5 reviews63 %
 1 user review13 %
Value For Money :

MGR/Sam's review"MXR Blue Box"

MXR M103 Blue Box Octave Fuzz
Paid $75 used

Somewhat random octaver with mondo fuzz. A neat and unpredictable effect to be used sparingly, in my opinion.

Very hard to control but I guess that's part of the charm..maybe once a night. The distortion is a bit much.

Excellent. Nice blue.

If Fool In The Rain were never recorded, no one would have ever thought about using this box. OK addition to an arsenal of analog effects.

This review was originally published on

moosers's review

MXR M103 Blue Box Octave Fuzz
The MXR Blue Box is an extremely unique sounding fuzz pedal.  It has a standard ¼ inch input and output and is powered by either a 9 volt battery or power supply.  It is not a rack mountable effect – it is a foot pedal.


The configuration of the MXR Blue Box really couldn’t be much easier than it is.  It only has two knobs – one for output and another for blend.  Since the nature of this pedal isn’t that of a typical fuzz box, these parameters are really all you need when it comes to this pedal.  This is overall as easy as it gets when it comes to using a guitar pedal.  I haven’t seen the manual for the MXR Blue Box, but I am confidently say that it isn’t necessary as it is a really simple pedal to use.


The sound of the MXR Blue Box is unlike any other pedal that I’ve really used.  While they advertise it as a fuzz and overdrive pedal, this isn’t your typical fuzz or overdrive pedal, and tends to do a lot of weird things that you don’t get with a traditional overdrive pedal.  To me this isn’t a bad thing, but users should just know that this isn’t a standard overdrive pedal and is really a combination of fuzz and overdrive mixed with some other kind of effect that is hard to explain.  It is almost a lo-fi kind of pedal and when used right can really produce some interesting results.


I’ve had my MXR Blue Box for about two years and while it isn’t an effect that I use everyday, I love having it around because you never know when it is going to come in handy.  The price of this pedal has dropped a bit over the last few years and they are now very cheap.  If you are looking for a pedal that is interesting and spontaneous, I would definitely recommend looking into this pedal by listening to some sounds clips of this pedal or trying it out.  Overall, an awesome and interesting unique pedal.

Balley Warson12/18/2011

Balley Warson's review (This content has been automatically translated from French)" Fat, and loss of volume Sale"

MXR M103 Blue Box Octave Fuzz
As prcdemment say, it's a fuzz a couple Octaver, or vice versa see just a noise machine! while the 100% analog.
among other effects used by Jack White, Lee Ranaldo and Thurston Moore


A volume knob to 100% all the time or we hear very little,
and a knob to blend Octaver left and right Fuzz, although Octaver never really hit with the same blend donf. trs is therefore easy to use, my favorite beach rglage: vol 100%, and blend 50 to 75%


So it's a PDAL "dirty" is dirty as his trs and its share in all directions, not easy to place on a piece.

I use it normally on my bass for a sound plutt Lo-Fi on the introduction of several pieces, but goes into RPET ingrable concert is due to the loss of volume, can be put in a loop pedals blend of dry / wet will settle the problem but on my bass dj trs fat (Gibson Thunderbird) an octave n ' forcment is not a good idea on guitar, however the effect is more suitable and passes better, but there is always this volume loss rcurrente.

For cons I love the sounds that I draw, I tend to be said that everything that AIM has messed my sound and makes it dirty and people say but what is it that b ** del! And it is well trs is not for nothing that the guys from Sonic Youth, uses or have used!


I have in my pedalboard for 4 months now, a friend Me with a prt Octave Multiplexer for grazing the sound of my Big Muff Pi on bass (all bass players rcurrent problem), then j 'Discoveries have this little blue mconnue bote that was fuzz and octave, and no more so I CHRE functions.

I love the sound it produces trs dirty and Lo-Fi, but it is unusable hlas in concert and just in BPS because of the loss of volume, goes better with a a bass guitar, but feared, shame because if you like the noise is a must have.

So in the end, mixed review I like the effect but the loss of volume is really agaante!

-Antoine-'s review (This content has been automatically translated from French)

MXR M103 Blue Box Octave Fuzz
It is a Fuzz / Octave / cradozeur.
2 knobs: volume output and his blend between "pitchquot, and the fuzz sound.
Simple, you know. A PDAL, an effect


With two buttons, you will not lose much. on the other hand, will perform all necessary to know how the bte ..


Ahah .. It is complicated. I'll try to explain, but it is not easy.
Objectively, in terms of "sound quality" is atrocious. It is exactly what we wanted. Rigor can use it as a fuzz / octave when playing a Młoda, but playing more than one note both recognizing not expect that we play. Note that the pitch varies greatly depending on the intensity that he sends. By sending a sin on a high note, the pitch of an octave boiboite the other without being able to do much. Finally, should express what.
I find that the output level is a bit feeble.
I like to put a big distortion before it to support just the signal.
The sample on the site gives an mxr ide of what some do when playing the real notes with.
Prfre I let it surprise me. For me, that's the only noisy. Finally, other people use it certainly appear different.


I've had six months. I use it every now and then, bit by bit, and I put trs long time to find what I could do with it. But now I'm glad trs.
I really regret the output level picks up a bit. So the volume button, it is nothing, it is always the max ..

MXR M103 Blue Box Octave Fuzz images

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  • MXR M103 Blue Box Octave Fuzz
  • MXR M103 Blue Box Octave Fuzz
  • MXR M103 Blue Box Octave Fuzz

MXR M103 Blue Box Octave Fuzz videos

MXR M103 Blue Box Octave Fuzz manuals and other files

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Other names: m103 blueboxoctavefuzz, m103blueboxoctavefuzz, m 103 blue box octave fuzz, m103blue box octave fuzz, m103 blue box octave fuzz, M103, M 103

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