MXR M238 Iso-Brick - Isolated Pedal Board Power Supply

Pedalboard Power Supply with 8 Fixed Voltage Outputs and 2 Variable Voltage Outputs
MXR M238 Iso-Brick - Isolated Pedal Board Power Supply image 1
MXR M238 Iso-Brick - Isolated Pedal Board Power Supply image 1
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MXR M238 Iso-Brick - Isolated Pedal Board Power Supply
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Flexibility and Convenience for Your Pedalboard

The MXR Iso-Brick pedalboard power supply is proof that MXR has a finger on the pulse of guitar players and their needs. As always at MXR, they recognized a need for a pedalboard power supply that fits with the way music makers play and the gear they use to make their music - enter the Iso-Brick. Boasting 10 fully isolated outputs that are optimized to handle a wide range of pedal types - vintage or brand new, analog or digital - MXR's Iso-Brick is just right no matter what your pedal pleasure may be.

MXR Iso-Brick Pedalboard Power Supply at a Glance:
  • Modern or vintage, digital or analog - the Iso-Brick has you powered
  • Easy to add to any effects set up
Modern or vintage, digital or analog - the Iso-Brick has you powered

MXR realizes that the world of effects has grown. They understand that these days a lot of musicians use a combination of digital and analog pedals, so the MXR Iso-Brick outputs are broken down to give you a variety of voltages and currents. You'll have two 9-volt outputs at 100mA, two 9-volt outputs at 300mA, two 9-volt outputs at 450mA, and two 18-volt outputs at 250mA - Sweetwater's guitar experts know that having this much flexibility from your power supply will open up your world of pedalboard possibilities. And if that's all the Iso-Brick gave you, it would still be a great solution to your pedal power problems. But what makes the Iso-Brick the coolest thing to ever hit your pedalboard are the two variable voltage outputs. Adjustable from 6-volts to 15-volts at 250mA, these outputs are perfect for powering your hungriest pedals or for plugging in those vintage pedals you spent years looking for only to realize modern power supplies are close, but just not right. These variable outputs also give you the opportunity to pull even more tones out of your current pedal rig by allowing you to redefine your sound using voltage - without soldering or worrying about sparks flying.

Easy to add to any effects set up

MXR really went above and beyond to ensure that the Iso-Brick is everything you need from a pedalboard power supply. From the LED status indicators that keep you apprised of what's going on with each pedal you have plugged into it, to making sure you have flexibility in mounting options when you add it to your already crowded pedalboard, the Iso-Brick is simply the easiest way to clean up your effects rig and be done with that spaghetti bowl of power cables. And it's not just for guitar players - bassists, keyboard players, synth-heads - if you use multiple pedals to get your tone, you need the Iso-Brick!

MXR Iso-Brick Pedalboard Power Supply Features:
  • A rugged, reliable, and compact pedalboard power supply
  • Modernized for your digital effects pedals
  • Great for vintage analog pedals to get the tone you're after
  • LED indicators keep you aware of pedal status
  • Includes a right-angled power cable for pedalboard friendly mounting flexibility
  • Variable-voltage outputs let you change tone using voltage
Get the most out of your pedalboard with the MXR Iso-Brick!

Tech Specs

Outputs 2 x 9V @ 100mA, 2 x 9V @ 300mA, 2 x 9V @ 450mA, 2 x 18V @ 250mA, 2 x Variable 6V to 15V @ 250mA
Manufacturer Part Number M238

Customer Reviews

Based on 17 reviews
Write your review

Really Good Power Supply

This power supply is great! Each individual output is isolated so it's super quiet. It has different power ratings as well so it will even give juice to your power hungry pedals with ease. It fits under my temple audio board but just barely. It's a really tight fit but that's okay because I know it won't be going anywhere. This power supply is all around really good and is worth the money. The most bang for your buck. Super satisfied with it. As always, sweetwater always delivers with killer customer service. Thanks for all of your help Pat!


The iso brick fit nicely under my pedal board and powered both my Strymon pedals demanding high current! Plus had enough of outlets to power my other pedals too! I'm very happy!

Update to Diggin' the Iso-Brick

After having the MXR Iso-Brick on my board for a few months, gigging and rehearsing with it, and playing around with the sag outputs (which work well, although they could improved with knobs that click into place instead of the smooth dialing design; turning one a little beyond the 9V line (poorly marked) and one could easily wreck a standard pedal), I'm writing this as a quick update to my original review of 4.5 stars. This product deserves 5 stars! The thing is dead quiet, small, and flexible. It powers each pedal on board with ease and doesn't affect my tone.
Music background: bassist, guitarist, percussionist, recordist

Works Perfectly

Totally quiet - even on compressors, overdrive, pedals, and my usually very noisy Fulltone Fatboost Pedal. Quieter than the wallwarts that come with the pedals. Very pleased. I recommend and would buy again.
Music background: Jazz, Folk, Country, Rock

Love the size and flexibility

I was not totally sure when I ordered this how well it would fit. I have a Holeyboard pedalboard, and needed something to fit under the riser. Other possible power supplies cost more and were bulky. When I got it, I was quite pleasantly surprised at the small size. I could easily fit another if I wanted. I love the various slots available. I'm now one volume pedal away from using them all (the 18V works good for an MXR EQ pedal and that soon to have volume pedal). Definitely seemed to make things more quiet than the OneSpot I was using before. Haven't needed the LEDs to troubleshoot a problem yet, but they are nice and bright and that would make it very easy to find a plug that had come undone, so feel comfortable having it. Although I haven't lowered the voltage on the variable slots to check out that drain sound yet, I plan to and it's nice to have that option. In all, great features in a small convenient package. Can't ask for more for the price.
Music background: worship band lead guitarist

Sweetwater Advice

Dunlop MXR M238 ISO Brick Power Supply

To start, it makes pedalboard layout easy. I used it for shows in the US, UK, and Europe, and setup was as simple as clipping on the appropriate attachment and plugging in - priceless convenience from a power supply brimming with stress-reducing features....
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See also: MXR, MXR Pedal & Effects Accessories