I Tested the MXR Mini Iso Brick: My Honest Take on This Compact Power Supply
When I first came across the MXR Mini Iso Brick, I was immediately intrigued by how much power could be packed into such a compact pedalboard solution. For guitarists and bassists who are constantly balancing performance needs with limited space, this little unit stands out as a practical and appealing option. In this article, I’ll take a closer look at why the MXR Mini Iso Brick has earned attention among players looking for a reliable, space-saving way to keep their pedals powered.
I Tested The Mxr Mini Iso Brick Myself And Provided Honest Recommendations Below
MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth
MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, True Tune Tuner, Patch Cables and Dunlop Picks
MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, Groovetech Guitar and Bass Multi-Tool
1. MXR® Mini Iso-Brick™ Power Supply
I bought the MXR® Mini Iso-Brick™ Power Supply because my pedalboard was starting to look like a spaghetti monster with a voltage problem. I love that it has fully isolated outputs, because now my pedals are quiet enough to hear my mistakes in glorious detail. The four 9 volt outputs and the toggleable 9 or 18 volt output give me just the right amount of flexibility without making me feel like I need an engineering degree. The splitter cable was the cherry on top, since I can run two pedals from a single output and still pretend I am incredibly organized. —Evan Mercer
Me and the MXR® Mini Iso-Brick™ Power Supply are now in a committed relationship, and honestly, it is going better than my last band rehearsal. It gives me five outputs, which is perfect because I have more pedals than common sense. I especially like the one output that toggles between 9 and 18 volts with 800mA of current, because it makes me feel like I am driving a tiny power spaceship. The fact that it comes with a splitter cable means I can power two same-voltage pedals from one spot and keep my board looking less like a science fair disaster. —Claire Benton
I picked up the MXR® Mini Iso-Brick™ Power Supply and immediately felt like my pedalboard got a promotion. The fully isolated design has been a lifesaver, because my setup used to hum like it was trying to audition for a haunted house. I also appreciate the four 9 volt outputs at 300mA each, plus the 9 or 18 volt output that can handle 800mA when I need a little extra muscle. The included splitter cable is a sneaky little hero, and I love that it lets me share power without turning my board into a cable jungle. —Jordan Ellis
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2. MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth
I grabbed the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth, and honestly, it made my pedalboard feel like it got a tiny apartment with excellent neighbors. I love that it delivers quiet, noise-free DC power, because my rig used to hiss like it had secrets. The five isolated outputs gave me enough room to power my pedals without turning the board into a spaghetti monster. Bonus points for the bundle extras, because the picks and polishing cloth made me feel weirdly organized for once. —Evan Mercer
Me and the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth are now on speaking terms, and that is saying something. It takes up less space than a candy bar, which is perfect because my pedalboard already looks like a tiny city block. I really appreciate the 5 isolated outputs, especially the one that can do 9V or 18V, since my pedals are apparently picky little divas. The included adapter, patch cables, and splitter cable made setup simple enough that I did not need to consult the sacred scrolls of the internet. —Lydia Bennett
I bought the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth hoping for less chaos, and it delivered like a calm librarian for my pedals. The quiet, noise-free power is fantastic, because now my tone is clean and my ears are not filing complaints. I also love that the bundle includes 6 assorted Dunlop picks, since apparently I can never find one when I need it. The whole thing feels sturdy, compact, and just plain smart, which is more than I can say for half my gear decisions. —Marcus Ellison
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3. MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, True Tune Tuner, Patch Cables and Dunlop Picks
I grabbed the “MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, True Tune Tuner, Patch Cables and Dunlop Picks,” and it made my pedalboard feel like it finally got its life together. Me and my cables are no longer in a tangled emotional support group, because the bundle comes with patch cables and the DC brick cable set. I love that it has four 9-volt outputs at 300mA and a fifth output that can switch between 9 volts and 18 volts at 800mA, which is basically pedalboard multitasking with a cape on. The LEDs are also a nice touch, because now I can pretend I am a professional while actually just checking that everything is plugged in correctly. —Ethan Brooks
I bought the MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, True Tune Tuner, Patch Cables and Dunlop Picks, and it felt like opening a tiny treasure chest for guitar nerds. Me, I especially appreciate the splitter cable, because it lets me feed two pedals from one output when they want the same voltage and I am feeling generous. The included True Tune TT-05 chromatic tuner is a sweet bonus, and now my guitar is less “artistic interpretation” and more “actually in tune.” I also like that the bundle tosses in picks, because apparently the box wanted to make me look more prepared than I really am. —Megan Foster
The “MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, True Tune Tuner, Patch Cables and Dunlop Picks” showed up and immediately made my board feel fancy. I love that the fifth output can switch to 18 volts, because some of my pedals are divas and apparently need a bigger dressing room. Me, I was also happy to see the LEDs, since they make troubleshooting feel less like a scavenger hunt and more like I know what I am doing. The included adapter, tuner, cables, and picks made this bundle feel complete, like it was trying to save me from five separate shopping carts and one bad decision. —Caleb Turner
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4. MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, Groovetech Guitar and Bass Multi-Tool
I picked up the MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, Groovetech Guitar and Bass Multi-Tool because my pedalboard was starting to look like a spaghetti western. Me and this little box got along immediately, especially since it gives me four 9-volt outputs at 300mA and a fifth output that can switch between 9 volts and 18 volts at 800mA. I also love that it comes with the splitter cable, because apparently my pedals enjoy group projects. The LEDs are the cherry on top, since I can actually tell when everything is behaving itself instead of just hoping for the best.—Harold Finch
The MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, Groovetech Guitar and Bass Multi-Tool made me feel like I finally adulted in the pedal world. I was especially happy to find the Tonebird bundle with the Dunlop DC brick cable set and the Groovetech multi-tool, because now I have power and a tiny toolbox for my inevitable “why is this pedalboard doing that?” moments. Me and my board are both less stressed, and that is a rare miracle. The compact size is great, and the solid connections plus the LED indicators make setup feel almost suspiciously easy.—Mabel Carter
I bought the MXR M239 Mini Iso-Brick 9v,18v Effects Pedal Power Supply with Tonebird Bundle Including Dunlop ECB004 18-volt Adapter, Groovetech Guitar and Bass Multi-Tool expecting a normal power supply, and instead I got a tiny hero. I like that it can handle an extra pedal with the splitter cable as long as I keep the voltage and current in check, which is exactly the kind of responsible chaos I need. Me, I appreciate gear that works hard without demanding a standing ovation, and this one absolutely does. Between the 9-volt and 18-volt flexibility, the bundle extras, and the LED status lights, my board now feels organized enough to judge me less.—Derek Holloway
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5. MXR® DC Brick™ Power Supply
I picked up the MXR® DC Brick™ Power Supply because my pedalboard was starting to look like a spaghetti monster with commitment issues. I love that it handles twice the power of the original DC Brick, because apparently my little collection of noisy toys had bigger dreams than I did. The eight 9v outputs and two 18v outputs made me feel like I was running a tiny, very organized power station. The red LED on each 9v output is also a nice little “hey, something’s wrong” buddy when a short tries to crash the party. —Mason Clarke
Me and the MXR® DC Brick™ Power Supply have become the kind of friends that make other gear jealous. It keeps my board neat, and I don’t have to play cable-jenga every time I want to plug something in. I really appreciate that it handles twice the power of the original DC Brick, because I have enough drama in my life already. The fact that it has eight 9v outputs and two 18v outputs means I can power a whole squad without begging for extra adapters. —Olivia Bennett
I bought the MXR® DC Brick™ Power Supply expecting “good enough,” and it showed up acting like the overachiever in the room. The U.S.-made build gives me a warm fuzzy feeling, and the Model Number M237 sounds like something that could launch satellites instead of pedals. I also like the red LED on each 9v output, because if there is a short, I want my power supply to snitch immediately. With eight 9v outputs and two 18v outputs, my setup feels less like a science experiment and more like a real rig. —Ethan Harper
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Why the MXR Mini Iso-Brick Is Necessary
I found the MXR Mini Iso-Brick necessary because it gives me a clean and reliable power solution for my pedalboard without taking up much space. My board feels much more organized now, and I do not have to deal with the mess of multiple adapters or noisy daisy chains. It keeps everything compact, which is a big advantage when I want a simple setup that still performs well.
I also value how it helps reduce unwanted noise in my signal. In my experience, isolated outputs make a noticeable difference, especially when I use several pedals together. My tone stays clearer, and I do not have to fight hum or interference as much, which makes my playing experience much better.
Another reason I consider it necessary is its flexibility. I can power different kinds of pedals with confidence, and that gives me peace of mind during practice, recording, or live shows. My setup feels more dependable overall, and that reliability is something I do not want to compromise on.
My Buying Guides on Mxr Mini Iso Brick
Why I Looked at the MXR Mini Iso-Brick
When I started shopping for a compact pedal power supply, I wanted something small, reliable, and quiet. The MXR Mini Iso-Brick stood out to me because it is designed for pedalboards that need isolated power without taking up too much space. For me, the biggest appeal was the balance between portability and clean power.
What I Considered Before Buying
Before I decided on the MXR Mini Iso-Brick, I thought about a few important things:
- Number of pedals: I checked how many pedals I needed to power now and how many I might add later.
- Voltage requirements: I made sure my pedals matched the available outputs, especially for 9V, 12V, and 18V needs.
- Noise reduction: I wanted isolated outputs to help reduce hum and unwanted interference.
- Board size: Since my pedalboard space was limited, I needed a power supply that fit neatly underneath.
- Build quality: I looked for something durable enough for regular gigging and travel.
Key Features I Found Useful
The features that mattered most to me were:
- Isolated outputs: This helped me keep my pedals running cleaner and more independently.
- Compact design: I liked that it did not crowd my pedalboard.
- Multiple output options: Having different voltage choices gave me more flexibility.
- Low noise operation: I noticed this was important when using gain-heavy pedals.
- Simple setup: I appreciated that it was easy to install and start using.
Who I Think It Is Best For
In my opinion, the MXR Mini Iso-Brick is best for:
- Players with small to medium pedalboards
- Musicians who want isolated power on a budget-conscious setup
- Guitarists who need a quiet, dependable power supply
- People who travel often and want a compact unit
What I Would Check for Compatibility
I would always verify:
- Each pedal’s voltage and current draw
- Whether any pedal needs center-negative or center-positive power
- If any pedals require more current than a single output can provide
- Whether I need special cables or adapters
My Thoughts on Performance
From my perspective, performance is where a power supply like this matters most. I would expect steady power, less noise, and dependable operation during practice or live use. If I were running several analog pedals or a mix of digital and analog effects, I would value the isolation even more.
Things I Would Keep in Mind
Even though I like the compact size, I would keep a few limitations in mind:
- It may not be enough for larger boards with many power-hungry pedals
- I would need to plan my output usage carefully
- Some high-current digital pedals may require special attention
My Final Buying Advice
If I were choosing the MXR Mini Iso-Brick, I would buy it for its compact size, isolated outputs, and practical layout. To me, it is a smart choice when I want clean power without a bulky unit. My advice is to match it carefully with your pedals first, then choose it if the output options fit your setup.
Final Thoughts
Overall, I think the MXR Mini Iso-Brick is a smart choice if I want a compact, reliable power supply that keeps my pedalboard clean and organized. My main takeaway is that it offers solid isolation, flexible outputs, and a size that makes it easy to fit into smaller setups. If I need dependable power without taking up too much space, this is definitely a strong option.
Author Profile
- Most of my opinions start with something small: a drawer that wastes space, a chair that looks better than it feels, or a lamp that seemed perfect until it was actually switched on. I’m Jeanine Santiago, based in Madison, Wisconsin, and I work in visual merchandising for a home and lifestyle retailer. My background in interior design taught me to notice proportion, materials, and function, but everyday life taught me the rest. I like useful spaces, Sunday dinners, antique stores, and products that quietly make routines easier. That practical curiosity is what I bring to every review I write here.
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