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Mxr M103 Blue Box

Code: M103
  • £92.99
  • (Delivery From £6.95)
  • RRP £99.19
Out of Stock | In Stock

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
Need more information on the Electro Harmonix range? Call us on 01254 265212

What Electro Harmonix say.....

This is the crazy effect heard on Jimmy Page's "Fool in the Rain" solo. The Blue Box takes your guitar signal and duplicates it two octaves down for a huge, subterranean tone. The Blend knob lets you control how much of the effected tone you mix in with your dry signal. Not for the timid—there is truly nothing like the Blue Box.

Other artists using the MXR Blue Box include: Paul Weller, Black Stone Cherry and Interpol.

What Reidys think:

A great combination of octave and fuzz, this pedal helps create a unique sound, housed in a sturdy and lasting case. A fantastic addition to any pedal board!

How to use the Blue Box:

To set up the Blue Box, plug your instrument into the Input jack and your amplifier into the
Output jack. Start with the Output knob all the way up (clockwise), and the Blend knob all
the way down (counterclockwise). Turn on the effect with the footswitch toggle, making sure the red
LED is ON to indicate that the effect is active. Then gradually raise the Blend knob
to increase the amount of distorted signal mixed with your clean signal. Experiment with different
settings, stopping when the desired blend of distortion is reached.

Once your distortion is set, adjust the Output knob for the desired output volume. You can start by
toggling the footswitch on and off, and comparing the volume with and without the distortion
effect. For many playing situations, matching the two volume levels is desirable, especially if
you’ll be switching distortion in and out while playing. However, you can also use the Output knob
to BOOST the overall volume for a solo, by adjusting it so that the effected volume is louder than
the clean signal.

Part of the charm of the Blue Box is that it creates two kinds of signals…those your
amp can process and reproduce, and other tones that are completely indigestible and non-
reproducible by your amp, creating interesting distortions. Every amp and every situation are
unique, and will create different results with the Blue Box. Experiment with each new situation,
and you’ll soon learn what the M-103 is capable of.

If your guitar has multiple pickups, you may find that the Blue Box works best with the bridge
pickup favored, and the neck pickup(s) rolled off. If you find that the distorted tones are causing
too much breakup or distortion in your speakers, turn down the Blend knob to mix
in a higher ratio of clean signal; or turn down the Output knob to reduce the overall volume coming
from the unit. You can also use the Blue Box with a compressor (see M-102 Dyna Comp) to
even out the levels and protect your amp from gain peaks. When connected upstream of a compressor,
the Blue Box will deliver the most controlled tones. When connected downstream of a compressor, the
amount of compression will activate independently of the Blue Box’s output.



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Coronavirus Update

Our chosen couriers are currently operating as normal and all orders should be delivered on time. DPD are also now operating a "contact-free" service as a standard process and customers will not be asked to sign handheld units.

Mainland UK Delivery Services

  • Next Working Day - Free for orders over £99, £8.95 otherwise (DPD, Next Working Day)
  • Standard - Free for orders over £99, £4.95 otherwise (DPD, 1-3 Working Days)

Order before 2pm, Monday to Friday, for same-day dispatch of in-stock orders. Very heavy items such as pianos may take longer to deliver. In-stock orders placed over the weekend will be dispatched on Monday. Estimated delivery times for out of stock items are to be used as a guide only, these items may take longer than estimated to arrive. While we try our best to ensure rapid delivery of your order, delays may occur which are outside our control, and delivery of large or bulky items, or to remote or non-mainland addresses may take longer than estimated.

Courier Tracking

Most UK deliveries are shipped by our trusted courier, DPD. You'll receive an email with a delivery day, tracking and a one hour estimated delivery window on the morning of delivery. While we can't specify the time of the delivery, if it's not convenient, you can arrange directly with DPD for an alternative delivery date or request the parcel be left with a neighbour.

For heavier items, we usually ship UK deliveries by TNT. You will receive an email with tracking details when we ship your order. 

Delivery Charges

Delivery to mainland UK addresses is free on all orders over £99. Delivery charges are based on the size and weight of your order and, in some cases, your location. A standard next working day carriage charge for UK mainland addresses is shown on the shopping basket page, but you can change delivery service later in the checkout.

Delivery Couriers

We use a few different delivery couriers, depending on the items being sent, your location, and the delivery service you've chosen:

  • UK inc. Northern Ireland: Most items will be shipped by DPD. Note: all items in your order must be in stock for all of your order to be dispatched on the same day.
  • UK inc. Northern Ireland: Most smaller items will be shipped by Royal Mail Recorded Delivery.
  • UK inc. Northern Ireland: Most very large or heavy items such as pianos are delivered by TNT, or by our in-house delivery service. Orders shipped by TNT are usually on a next working day service, whereas items using our in-house delivery service may take longer. Note: Delivery to non-ground-floor addresses without a suitable lift will cost extra.
  • Europe: Most orders will be shipped by DPD International. Delivery times and charges depend on your location - these charges will be displayed in the order basket.

Most orders will need to be signed for and we advise you make sure to check your parcel/s for any damage before signing. If no-one is available at your address, a card will be left so you can arrange a re-delivery directly with the courier. Redirection of an order after it's been dispatched may incur an extra charge from the courier.

Delivery Areas & European Shipping

Delivery charges displayed apply to most UK mainland addresses. Deliveries to Northern Ireland, UK non-mainland, and European addresses will cost more, and carriage charges will be shown at the checkout before you place your order. Free delivery offers may not apply to some remote/Scottish Highlands addresses.


Coronavirus Update

There are currently delays for all returns processing due to extra safety procedures. Thanks for your patience during this difficult time.

Replacement process for items damaged in transit or faulty items

It doesn't happen often, but occasionally an item can get damaged on the way to you. Don't worry! If your order is received either damaged or faulty, just let us know, preferably using the returns request form within 30 days of receiving the item, and we'll arrange for it its return and for a replacement or refund.

Returning an undamaged item

You can return most items bought online or by phone within 14 days for a refund (provided that it is unused and returned to us in New Condition – including packaging). You will need to return the item at your own expense. When we receive the goods back undamaged and with the correct packaging we will refund the cost of the goods.

Software or products that include software that needs to be registered are not eligible for this 14 day return period if opened and installed, and due to hygiene reasons we can't accept certain used in-ear headphones, microphones or harmonicas.

Faulty items under guarantee

The repair procedure for items which are under guarantee varies from manufacturer to manufacturer - please refer to the documentation which accompanied your purchase or complete the returns request form and we will advise you of the appropriate process.