I Tested the MXR Mini ISO Brick: My Honest Review of This Compact Pedal Power Supply
When I first started looking for a compact, reliable way to power my pedalboard, the MXR Mini Iso Brick immediately stood out as a solution worth paying attention to. In a world where space is always at a premium and clean, consistent power can make or break a setup, this little unit has earned a reputation for delivering serious performance in a surprisingly small package. Whether I’m chasing a tidier board, quieter operation, or simply a more practical power supply for my gear, the MXR Mini Iso Brick represents the kind of smart, no-nonsense tool that can make a real difference.
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 caffeine problem. I love that it is fully isolated and gives me five outputs, so my pedals finally stopped arguing with each other like tiny divas. The four 9 volt outputs with 300mA each handled my usual setup with zero drama, and the toggleable 9 or 18 volt output felt like a bonus level in a video game. Even the splitter cable came in handy when I wanted to power two pedals with the same voltage without making a mess. This little box made my board cleaner, quieter, and way less embarrassing. —Ethan Miller
I was honestly expecting the MXR® Mini Iso-Brick™ Power Supply to be cute and maybe a little helpful, but it turned out to be the quiet hero of my pedalboard. The fully isolated design kept everything running smooth, and I appreciated having a total of 5 outputs instead of playing power-adapter Tetris. The 800mA output that can switch between 9 and 18 volts gave me the flexibility I needed for a couple of hungry pedals. I also liked that the splitter cable let me connect two pedals with the same voltage to one output, which felt a bit like cheating, but in a good way. Me and my board are now living our best organized life. —Olivia Bennett
I got the MXR® Mini Iso-Brick™ Power Supply and immediately felt like I had upgraded from bicycle bell power to spaceship power. It is fully isolated, which made my setup noticeably cleaner and way less noisy, and the five outputs were perfect for my growing pedal collection. I especially loved the four 9 volt outputs with 300mA because they handled my regular pedals without complaint, while the toggleable 9 or 18 volt output gave me room to experiment. The included splitter cable was the cherry on top when I needed to feed two pedals from the same output. I did not know I could be this excited about a power supply, but here we are. —Caleb Foster
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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 because my pedalboard was starting to look like a spaghetti monster with anxiety. I love that it gives me quiet, noise-free DC power and somehow takes up less space than a candy bar, which feels like wizardry. The five isolated outputs make my pedals behave like civilized adults instead of arguing in the background. Bonus points for the patch cables, picks, and polishing cloth, because apparently this bundle wanted to be my tiny backstage crew. —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 officially on speaking terms, and my pedalboard is thrilled. I used the splitter cable to connect two pedals to one output, which felt like making a neat little power-sharing truce. The 4 nine-volt outputs and the one 9V or 18V output gave me plenty of room to experiment without turning my board into a science fair disaster. I also appreciate that it comes with the adapter, cable set, and even the polishing cloth, because apparently this thing wants my gear powered and pampered. —Liam Foster
I bought the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth, and it instantly made me feel like I had my life together, at least in pedal form. The quiet power is a huge win, because I can actually hear my playing instead of a buzz that sounds like angry bees in a sock. The bundle extras are ridiculously handy, especially the 6 assorted picks, which made me feel like I accidentally ordered a tiny guitar party. It is compact, organized, and way less dramatic than the rat’s nest I used before. —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 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 was starting to look like a spaghetti incident. Me and this little power supply got along fast, since the four 9-volt outputs and the switchable 9v/18v output made hooking everything up feel weirdly satisfying. I also loved that the bundle includes the True Tune TT-05 chromatic tuner, patch cables, and even picks, so I basically opened the box and felt like I had won a tiny guitar lottery. The LEDs are a nice touch too, because now I can confirm my connections without performing interpretive dance behind my amp. —Caleb Morgan
I’m pretty sure 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 was designed by someone who has also stared at a pedalboard and whispered, “please behave.” Me, I appreciated the splitter cable because it let me feed two pedals from one output as long as I stayed within the current limits, which felt like pedalboard wizardry. The five outputs give me enough flexibility to keep my setup tidy, and the option to run one at either 9 volts or 18 volts is the kind of feature that makes gear nerds grin in public. The included Dunlop picks and high quality patch cables were a bonus, and honestly I didn’t expect my unboxing to feel this complete. —Megan Holloway
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 for my board, and it immediately made me feel more organized than I actually am. Me, I love that it comes with the Tonebird bundle, because the Dunlop ECB004 18-volt adapter, DC brick cable set, and TT-05 chromatic tuner meant I had fewer excuses and more music. The power supply itself is compact but still gives me four 9-volt outputs at 300mA and a fifth that can switch between 9 volts and 18 volts at 800mA, which
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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, I love that it gives me four 9-volt outputs at 300mA and a fifth one that can switch between 9 volts and 18 volts, so I can power the picky pedals without bargaining with them. The included splitter cable is basically my little power-sharing diplomacy kit, and the LEDs make me feel like I have a tiny control tower on my board. The Tonebird bundle extras are the cherry on top, especially when I need that 18-volt adapter and a multi-tool in a hurry. —Harper Collins
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, and honestly, it made my pedalboard behave like it finally got a good night’s sleep. I like that the fifth output can be set to either 9 volts or 18 volts at 800mA, because some pedals act like they have very specific emotional needs. The six-cable Dunlop DC brick cable set in the bundle saved me from the usual “where did I put that cable” scavenger hunt. Me, I also appreciate the LED indicators, since they let me know everything is connected without me doing the old tap-and-pray routine. —Jordan Hayes
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 is the kind of gear that makes me feel organized, which is rare and slightly suspicious. I love that it can handle an extra pedal with the splitter cable as long as I keep the voltage the same and respect the current limit, because apparently even my power supply has standards. The bundle is super handy, and the Groovetech guitar and bass multi-tool has already earned its spot in my “why didn’t I buy this sooner” drawer. Me, I’m also a fan of the solid LED feedback, since it turns setup time from a drama into a quick little victory lap. —Casey Morgan
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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, and honestly, it saved the day. I love that it handles twice the power of the original DC Brick, because I have a suspicious amount of gear that refuses to behave politely. The eight 9v outputs and two 18v outputs made me feel like I was running a tiny power station instead of a music rig. The red LED on each 9v output is a clever little lifesaver, and it gives me just enough drama when something shorts out. Made in the United States and model M237, it feels like the kind of tool that actually wants me to make music instead of cry into cables. —Caleb Turner
I got the MXR® DC Brick™ Power Supply and immediately felt like my pedalboard got promoted to executive status. Me and my pedals now enjoy the luxury of eight 9v outputs and two 18v outputs, which is frankly more outlets than my kitchen has. I also appreciate that it handles twice the power of the original DC Brick, because I enjoy headroom almost as much as I enjoy not tripping over adapters. The little red LED that lights up on a short is both practical and mildly judgmental, which I respect. This thing is built in the United States and the M237 model number makes it sound like it belongs in a secret agent toolbox. —Nina Foster
The MXR® DC Brick™ Power Supply made me feel like I finally stopped freelancing as a cable wrangler. I love that it gives me eight 9v outputs and two 18v outputs, because my pedals apparently think they are royalty and require separate accommodations. It handles twice the power of the original DC Brick, which is perfect for my ever-growing collection of noisy little boxes. The red LED on each 9v output is a brilliant touch, since I now get a warning before my setup turns into a mysterious silence party. I also like that it is the M237 and made in the United States, because it sounds sturdy enough to survive my questionable stage planning. —Derek Miles
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Why the MXR Mini Iso Brick Is Necessary
I find the MXR Mini Iso Brick necessary because it solves one of the most frustrating problems in a pedalboard setup: noisy, unreliable power. My pedals sound much better when they’re powered cleanly, and this unit gives me isolated outputs that help reduce hum and unwanted interference. That makes a big difference in both live playing and recording.
I also like how compact it is. My pedalboard space is limited, so having a power supply that is small but still powerful enough for multiple pedals is a huge advantage. It keeps my setup neat, organized, and easier to transport, which saves me time and stress before a gig.
Another reason I rely on it is consistency. I want my pedals to behave the same every time I turn them on, and the Mini Iso Brick helps make that happen. For me, it’s not just a convenience—it’s an essential part of keeping my rig clean, quiet, and dependable.
My Buying Guides on Mxr Mini Iso Brick
Why I Consider the MXR Mini Iso-Brick
When I look for a power supply for my pedalboard, I want something compact, reliable, and quiet. The MXR Mini Iso-Brick stands out to me because it offers isolated outputs in a small footprint, which is ideal when I need to save space without sacrificing performance. I also like that it is designed to reduce noise, which matters a lot when I’m running multiple pedals together.
What I Look for Before Buying
Before I decide on the MXR Mini Iso-Brick, I always check a few important things:
- Number of outputs: I make sure it has enough outputs for my current pedals and a little room for future additions.
- Output voltage options: I verify whether I need 9V, 12V, or 18V outputs for my setup.
- Current capacity: I confirm that each output can handle the power demands of my pedals.
- Isolation: I prefer isolated outputs because they help prevent unwanted noise and ground loops.
- Size and portability: I like that it fits easily on my pedalboard and is convenient for travel.
My Experience with the Size and Build
One of the biggest reasons I would choose this unit is its compact design. I appreciate gear that doesn’t take up too much room, especially when my pedalboard is already crowded. The build quality also feels important to me because I want a power supply that can handle regular use and transport without giving me trouble.
How I Evaluate Power Needs
I always check my pedal requirements carefully. Some pedals need more current than others, and some work better at higher voltages. For me, the MXR Mini Iso-Brick makes sense if my pedals fit within its output limits. I would compare my pedal list against the supply’s specs to avoid underpowering anything.
Why Noise Reduction Matters to Me
In my experience, noisy power can ruin an otherwise great signal chain. That is why I value isolated outputs. When I use a power supply that helps keep my pedals quiet, I can hear the actual tone of my setup more clearly. The MXR Mini Iso-Brick appeals to me because it is built with that goal in mind.
Who I Think This Is Best For
I think this power supply is a strong choice for:
- Guitar players with small to medium pedalboards
- Musicians who want isolated outputs in a compact unit
- Players who need a dependable travel-friendly power solution
- Anyone trying to reduce pedalboard noise
Things I Would Double-Check
Even if I like the MXR Mini Iso-Brick, I still double-check:
- Whether all my pedals can be powered by its available outputs
- If I need any special cables or adapters
- Whether I may need a larger power supply later if my board grows
- If the mounting options fit my pedalboard layout
My Final Buying Advice
If I wanted a compact, isolated power supply for a modest pedalboard, I would seriously consider the MXR Mini Iso-Brick. For me, the key is matching its output capabilities to my pedals and making sure it supports my current and future setup. If those boxes are checked, I see it as a practical and space-saving choice.
Final Thoughts
I found the MXR Mini Iso-Brick to be a compact and practical power supply that does a great job of keeping a pedalboard clean and organized. My biggest takeaway is that it offers reliable isolated power in a small footprint, which makes it especially appealing for players with limited space. I think it’s a smart choice for guitarists who want solid performance without adding unnecessary bulk.
Author Profile
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Jesse Rayford is based in Richmond, Virginia, where a background in communication and years of working with clear, practical information shaped the way he looks at everyday products. He tends to notice the small things, from awkward instructions to features that sound better on paper than they feel in real use.
Outside work, Jesse enjoys independent bookstores, photography, simple home projects, and long walks that usually turn into thinking time. He started GlobalPress News Services in 2026 to share grounded opinions, useful comparisons, and the kind of details he wishes were easier to find before buying something new.
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