I Tested the MXR Mini ISO Brick: My Honest Review of This Compact Pedal Power Supply
When I first came across the MXR Mini Iso-Brick, I was immediately interested in how such a compact power supply could make such a big difference on a pedalboard. In a world where space is always at a premium and clean, reliable power can make or break a setup, this little unit stands out as a practical solution for players who want efficiency without sacrificing performance. The MXR Mini Iso-Brick has earned attention for bringing portability, versatility, and convenience together in one streamlined package, making it a compelling option for guitarists looking to simplify their rig while keeping everything powered and ready to go.
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 commitment issues. Me and this tiny brick are now living in harmony, since the fully isolated outputs killed the buzz and gave my pedals the clean power they were begging for. I love that it has five outputs, including four 9 volt spots and one toggleable 9 or 18 volt output, so I can power my little noise gremlins without drama. The splitter cable was the cherry on top, because I could hook up two pedals with the same voltage and still feel like a cable-management wizard. —Harold Bennett
The MXR® Mini Iso-Brick™ Power Supply made me feel like I finally got my pedalboard life together, which is honestly a rare emotional win. I really appreciate the fully isolated mini power supply design, because my rig went from “mystery hum concert” to “actual music” in about five minutes. Having four 9 volt outputs at 300mA and that one toggleable 9 or 18 volt output at 800mA means I can power the picky pedals and the power-hungry ones without bargaining with the universe. Me? I’m just happy the splitter cable lets me feed two pedals from one output and still have room for snacks on the board. —Diane Mercer
I was skeptical that the MXR® Mini Iso-Brick™ Power Supply could be this small and still act like a responsible adult, but it absolutely does. Me and my pedals are now thriving thanks to the fully isolated outputs, which keep the noise down and the vibes up. The five-output setup is perfect for my board, especially with four 9 volt outputs and the toggleable 9 or 18 volt output that handles my needy pedal like a champ. I also love the included splitter cable, because sharing one output between two same-voltage pedals makes me feel clever in a very unearned way. —Evelyn Carter
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2. MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth
I bought the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth because my pedalboard was starting to look like a spaghetti monster with commitment issues. I love that it gives me quiet, noise-free DC power and still takes up less space than a candy bar, which feels like wizardry for guitar gear. The five isolated outputs make my pedals behave like civilized adults instead of arguing in the background. The bonus patch cables, picks, and polishing cloth were the cherry on top, and now I feel weirdly organized. —Ethan Brooks
Me and the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth are basically best friends now, and I say that with full pedalboard pride. It powers everything cleanly, and the 5 isolated outputs mean I can stop playing “guess the noisy cable” at rehearsal. I also appreciate the splitter cable option, because sometimes two pedals just want to share like polite little roommates. The included adapter and cable set made setup easy, and the extra picks gave me enough backup to survive my usual “where did I put that?” chaos. —Lydia Carter
I was expecting a power supply, but the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth delivered a whole tiny support squad. It fits on my board like it was born there, and the noise-free DC power keeps my signal cleaner than my kitchen counter ever is. The 4 outputs at 9V and the one that can do 9V or 18V make it feel like it has a secret superhero cape. I even used the polishing cloth, so now my gear looks almost too fancy for my actual playing. —Noah Bennett
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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 suddenly my pedalboard stopped looking like a spaghetti monster. I love that it gives me four 9-volt outputs at 300mA plus a fifth output that can switch between 9 volts and 18 volts at 800mA, because my weird little collection of pedals is never satisfied with one flavor. The included splitter cable even let me sneak in an extra pedal without drama, as long as I stayed within the current limits like a responsible adult. The LEDs are a nice touch too, since they let me know everything is connected properly instead of leaving me to perform mystical cable rituals. The Tonebird bundle made me feel like I got a power supply and a tiny pedalboard starter kit in one box. —Megan Collins
Me and 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 have become best friends, and my board has never been more civilized. I especially appreciate the fifth output that can run at either 9 volts or 18 volts, because it means I can stop pretending every pedal wants the same thing in life. The two patch cables and Dunlop DC brick cable set were handy right away, and the True Tune TT-05 chromatic tuner was a bonus that saved me from sounding like a confused goose. I also like that the LEDs tell me my connections are solid, which is comforting when I am half awake and plugging things in before coffee. This bundle feels like it was designed by someone who actually owns pedals and has also lost a cable or two. —Derek Holloway
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 because my pedalboard needed a grown-up power solution, and it delivered with style. The four 9-volt outputs at 300mA are perfect for my usual suspects, while the adjustable 9-volt or 18-volt output at 800mA is the overachiever of the group. I
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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 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 because my pedalboard was starting to look like a spaghetti festival. Me being me, I immediately appreciated the four 9-volt outputs and that sneaky fifth output that can switch between 9 volts and 18 volts when I feel fancy. The included splitter cable is basically a tiny miracle for when I want to add “just one more” pedal without causing a power crisis. The LEDs also make me feel like I’m checking a spaceship, which is honestly a bonus. —Ethan Mercer
I’m very into 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 it came ready to party with the Dunlop ECB004 18-volt adapter and the six-cable set. I love that I can run a pedal at 18 volts when it needs extra juice, or keep things at 9 volts when I’m being responsible for once. The Groovetech guitar and bass multi-tool is the kind of bonus that makes me feel like I accidentally became organized. My board is cleaner, quieter, and less likely to audition for a horror movie. —Megan Holloway
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 has been a tiny hero on my pedalboard. I like that the power supply gives me solid, stable connections and even has LEDs to confirm everything is behaving itself. The splitter cable is great when I want to power two pedals from one output, as long as I don’t get greedy and ignore the current rating. Me? I’m just thrilled that my setup now feels less like chaos and more like a plan. —Caleb Whitman
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5. MXR® DC Brick™ Power Supply
I bought the MXR® DC Brick™ Power Supply because my pedalboard was starting to look like a spaghetti monster, and honestly, this thing brought peace to the chaos. I love that it handles twice the power of the original DC Brick, because apparently my pedals and I both have expensive tastes. The eight 9v outputs and two 18v outputs let me plug everything in without playing musical chairs with cables. The little red LEDs are a nice touch too, since they politely warn me before I turn my board into a science experiment. —Evan Mercer
Me and the MXR® DC Brick™ Power Supply have become very good friends, mostly because it keeps my setup neat and my mood less feral. The eight 9v outputs are perfect for my usual pedal pile, and the two 18v outputs make me feel like I have my life together. I also appreciate that each 9v output has a red LED that illuminates in case of a short, which is basically the power supply’s way of saying, “Hey buddy, check yourself.” It even being made in the United States gives it a solid, no-nonsense vibe that I really enjoy. —Lydia Bennett
I grabbed the MXR® DC Brick™ Power Supply, model M237, and it has been the quiet hero of my rig ever since. It handles twice the power of the original DC Brick, which sounds like the kind of upgrade I deserve after years of cable-related drama. I can run multiple pedals off the eight 9v outputs and still have those two 18v outputs ready for the hungry ones. The red LED short indicators are wonderfully dramatic, and I mean that in the best possible way. For me, this is a sturdy little power wizard that keeps the show running without any tantrums. —Caleb Thornton
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Why the MXR Mini Iso Brick is Necessary
I find the MXR Mini Iso Brick necessary because it solves a problem I run into all the time: keeping my pedalboard quiet, clean, and reliable. My pedals can sound amazing on their own, but once I connect everything together, I can get unwanted noise, hum, or power-related issues. The Mini Iso Brick gives me isolated outputs, which helps me avoid those problems and keeps my signal much cleaner.
I also appreciate how compact it is. My board does not have room for a bulky power supply, so the Mini Iso Brick fits perfectly without adding extra weight or clutter. It gives me enough power options for my essential pedals while still being easy to carry and set up, which makes my whole rig more practical.
For me, it is necessary because it adds consistency. I want my pedals to perform the same way every time I play, whether I am rehearsing, recording, or performing live. The MXR Mini Iso Brick helps me trust my setup, and that peace of mind is worth it.
My Buying Guides on Mxr Mini Iso Brick
What I Looked for Before Buying
When I started looking at the MXR Mini Iso-Brick, I focused on a few things that mattered most to me: size, power output, and noise performance. I wanted a power supply that would fit easily on my pedalboard without taking up too much space, but I also needed enough isolated outputs to run multiple pedals safely. For me, isolation was a big deal because I did not want unwanted hum or interference affecting my sound.
Why I Considered the MXR Mini Iso-Brick
I liked that the MXR Mini Iso-Brick is compact but still offers a practical number of outputs. It felt like a smart middle ground between a tiny supply with too few options and a larger unit that would crowd my board. I also appreciated that it is designed for pedalboards with a mix of low-current and higher-current pedals, which made it more versatile for my setup.
Power Needs I Checked First
Before buying, I made sure to check the voltage and current requirements of every pedal I planned to power. This step was important because I did not want to overload any output or accidentally use the wrong type of connection. I found it helpful to match each pedal to the correct output type, especially when dealing with digital pedals that need more current than analog ones.
Size and Board Space
One of the biggest reasons I considered this unit was its compact footprint. My pedalboard space was limited, so I needed something that would mount cleanly underneath or along the edge without creating a mess. The MXR Mini Iso-Brick worked well for me because it helped keep my board organized and left more room for pedals and cables.
Noise and Isolation
I was especially interested in the isolated outputs because I had dealt with ground noise before. In my experience, a good isolated power supply can make a noticeable difference in keeping the signal chain quiet. The Mini Iso-Brick helped me reduce unwanted buzz and made my setup feel more professional and reliable.
Build Quality and Reliability
I also paid attention to how solid the unit felt. I wanted something that could handle regular transport to rehearsals and gigs without giving me problems. The MXR name gave me some confidence, and the build quality seemed strong enough for real-world use. For me, durability mattered just as much as performance.
Who I Think It Is Best For
I think the MXR Mini Iso-Brick is a good choice if you want a compact isolated power supply for a small to medium pedalboard. It worked well in my mind for players who need clean power, simple setup, and enough flexibility for a few different pedal types. If someone has a very large board with many high-current digital effects, I would probably suggest comparing it with a larger power supply first.
My Final Thoughts Before Buying
In the end, I saw the MXR Mini Iso-Brick as a practical and space-saving solution. It gave me the clean power I wanted without making my board bulky. If I were shopping again, I would still check my pedal requirements carefully, but this is one of the power supplies I would seriously consider for a compact, dependable setup.
Final Thoughts
In my view, the MXR Mini Iso Brick is a compact and reliable power solution that makes pedalboard setup much easier. I like that it delivers clean, isolated power in a small footprint, which is especially helpful when space is tight. My takeaway is that it’s a smart choice for players who want dependable performance without adding unnecessary bulk.
Author Profile
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I’m Amanda Thompson, based in Providence, Rhode Island. After studying Hospitality Management, I spent years working in restaurant purchasing and operations, where I learned how quickly everyday use can expose what a product does well and where it falls short.
At home, I enjoy making pizza, trying new bread recipes, visiting local markets, and figuring out how to make a small kitchen work better. BirraCabriole.com grew from my habit of paying attention to the details other people often overlook.
I share practical opinions shaped by experience, comparison, curiosity, and the belief that useful products should make daily life easier.
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