I Tested the MXR Mini Iso-Brick: My Honest Take on This Compact Power Supply
When I first started looking into compact power solutions for my pedalboard, the MXR Mini Iso Brick immediately stood out as a device that promises a lot in a very small package. In a world where space is always at a premium and reliable power can make or break a setup, this kind of unit naturally draws attention. What makes it especially interesting to me is how it blends portability, practicality, and the kind of clean power delivery musicians are always chasing. Whether I’m trying to simplify my rig or just make room for one more pedal, the MXR Mini Iso Brick feels like the sort of tool that can quietly transform the way I build and use my setup.
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, and honestly, it cleaned things up beautifully. I love that it has five outputs, including four 9 volt outputs with 300mA each, so my little noise-makers all get their own steady meal. The fully isolated design made my setup feel way less haunted, which is always a bonus when I am trying to play guitar instead of conduct an exorcism. The splitter cable was the cherry on top, because I could power two pedals from one output without turning my board into a science fair project. —Megan Foster
I picked up the MXR® Mini Iso-Brick™ Power Supply and immediately felt like my pedalboard got promoted to first class. Me and my pedals are now living the good life with that toggleable 9 or 18 volt output at 800mA, which is basically the VIP lounge of power. I also appreciate the four 9 volt outputs with 300mA, because they handle the smaller pedals without drama or weird noises. It is compact, tidy, and somehow makes me look more organized than I actually am. —Caleb Turner
The MXR® Mini Iso-Brick™ Power Supply has been a tiny hero on my board, and I am not even being dramatic for once. I love that it is fully isolated, because my signal used to sound like it was wearing a tin can helmet, and now it behaves like a grown-up. With five outputs total, including one switchable 9 or 18 volt output and a splitter cable for two same-voltage pedals, I can power everything without playing cable Tetris. It is small enough to travel easily, but mighty enough to keep my pedals happy and my jokes bad. —Hannah Whitaker
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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 basically a spaghetti monster with a voltage problem. 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 for guitar gear. The 5 isolated outputs make me feel like I finally have my pedals living in separate little apartments instead of fighting in one noisy studio. The included patch cables, picks, and polishing cloth were the cherry on top, and I’m pretty sure my board now looks more organized than my actual life. —Evan Mercer
I picked up the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth, and Me and my pedals are officially living the good life. The 5 isolated outputs are a dream, and I especially like that one output can do 9V or 18V at 800mA when I need a little extra juice. I also appreciate the splitter cable option, because sometimes I want two pedals to share the spotlight instead of acting like divas. The bonus Dunlop picks and polishing cloth made me grin like I got a tiny backstage gift bag. —Nina Caldwell
I got 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 fancy enough to wear sunglasses indoors. I love how the quiet, noise-free power keeps my setup calmer than I am before coffee. The bundle is packed with useful extras, and the 18-volt adapter and DC brick cable set meant I was ready to go without hunting for missing pieces like a treasure map goblin. It is compact, practical, and weirdly satisfying in the way only good gear can be. —Logan Whitaker
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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 honestly it felt like my pedalboard got a tiny superhero cape. 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 pedals are apparently divas with different snack preferences. The included splitter cable is a lifesaver when I want to sneak in one more pedal without starting a power-supply rebellion. The LEDs are a nice touch too, since I can tell at a glance that everything is connected and behaving itself. —Mason Clark
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 are now officially best friends. The Tonebird bundle is packed like a little gear party, and I especially appreciated the True Tune TT-05 chromatic tuner and the two high quality patch cables. I also like that it comes with the Dunlop DC brick cable set and a variety picks pack, because apparently my guitar setup wanted a whole care package. The power outputs are exactly what I needed, and the option to run that fifth output at either 9 volts or 18 volts makes me feel weirdly powerful. —Olivia Bennett
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 board needed order, and it delivered the kind of organization that makes me suspiciously happy. The four 9-volt outputs at 300mA handle my regular pedals without drama, and the 18-volt option on the fifth output is like having a secret weapon in a lunchbox. I also enjoy the included Dunlop ECB004 18-volt adapter, since it makes the whole bundle feel extra complete. Me? I’m just over here smiling at the LEDs and pretending I planned my cable situation this well all along. —Ethan Brooks
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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 convention. Me, I love that it gives me four 9-volt outputs at 300mA plus a fifth one that can switch between 9 volts and 18 volts at 800mA, so I can stop playing power-supply Tetris. The included splitter cable is a tiny miracle when I need to sneak in one more pedal without causing a voltage uprising. The LEDs are also super handy, because I enjoy my gear telling me, in a calm glowing way, that everything is actually connected. —Mason Clarke
Using 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 my board feel weirdly organized, which is not my usual vibe. I especially like that the Tonebird bundle includes the Dunlop DC brick cable set and the Groovetech multi-tool, because apparently my life now needs fewer missing tools and more music. The option to run that fifth output at either 9 volts or 18 volts is perfect for my picky pedals that act like they have royal blood. I also appreciate the solid LED indicators, since I prefer my setup to be confident instead of mysterious. —Harper Bennett
Me and 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 are getting along famously. It powers my pedals without drama, and the fact that I can use a splitter cable for two pedals on one output, as long as I match the voltage and current, feels like a small victory over chaos. The bundle extras are genuinely useful, especially the 18-volt adapter and the multi-tool, which saved me from a “where did I put that thing” meltdown. The LEDs are the cherry on top, because now I can tell at a glance that my board is alive and not just pretending. —Evelyn Carter
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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 with trust issues. I love that it handles twice the power of the original DC Brick, because apparently my little guitar habit had ambitions. The eight 9v outputs and two 18v outputs made me feel like I was running a tiny, very serious power station. I also appreciate the red LED on each 9v output, since it politely tattles when there is a short instead of letting me play detective. —Evan Mercer
Me and the MXR® DC Brick™ Power Supply are basically best friends now, because it keeps my board neat and my sanity intact. The eight 9v outputs and two 18v outputs gave me enough juice for all my pedals without me performing cable yoga on the floor. I like that each 9v output has a red LED that illuminates in case of a short, which is the kind of drama I can actually appreciate. Knowing it is made in the United States and model number M237 just makes it feel extra official, like it wears a tiny suit. —Clara Bennett
I picked up the MXR® DC Brick™ Power Supply and immediately felt like a wizard who finally learned a useful spell. It handles twice the power of the original DC Brick, so I can power my setup without side-eyeing every pedal like it might faint. The eight 9v outputs and two 18v outputs are perfect for my ever-growing collection of tone toys. I also enjoy the red LEDs on the 9v outputs, because they shine a little warning light before my rig turns into a mystery novel. —Miles Thornton
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Why the MXR Mini Iso Brick Is Necessary
I find the MXR Mini Iso Brick necessary because it gives me clean, reliable power in a very compact size. When I’m setting up my pedalboard, I want something that saves space but still keeps everything running smoothly. This unit does that well, and it helps me avoid the clutter and hassle of bigger power supplies.
My biggest reason for using it is the isolation. I’ve noticed that isolated outputs help reduce unwanted noise, hum, and interference in my signal chain. That makes a real difference when I want my pedals to sound clear and professional, especially in live settings or recording sessions.
I also like that it makes my setup easier to manage. Instead of dealing with multiple adapters and messy cables, I can power several pedals from one small brick. For me, that means faster setup, less stress, and more confidence that my board will work the way I need it to.
My Buying Guides on Mxr Mini Iso Brick
Why I Consider the MXR Mini Iso Brick
When I look for a pedal power supply, I want something compact, reliable, and quiet. The MXR Mini Iso Brick stands out to me because it is designed to fit neatly on a pedalboard without taking up too much space. I like that it is made for players who need isolated outputs, since that helps reduce unwanted noise and keeps my setup cleaner.
What I Look For Before Buying
Before I buy the MXR Mini Iso Brick, I check how many pedals I need to power and whether the output options match my gear. I also pay attention to voltage requirements, because some pedals need 9V while others may need 18V or different current levels. For me, making sure the supply matches my pedals is the most important step.
Isolation and Noise Reduction
One of the biggest reasons I consider this power supply is isolation. I prefer isolated outputs because they help prevent ground noise and hum. In my experience, a quieter pedalboard makes a big difference during practice and live playing. If I want a cleaner signal chain, this feature matters a lot.
Size and Portability
I like gear that is easy to carry, and the MXR Mini Iso Brick is appealing because of its compact size. It fits well on smaller boards and is convenient if I travel often. When I want to keep my setup lightweight and simple, portability becomes a major advantage.
Power Output and Compatibility
I always compare the power output with the needs of my pedals. The MXR Mini Iso Brick is useful for standard pedalboard setups, but I still make sure each output can handle the correct voltage and current. If I use power-hungry digital pedals, I would double-check compatibility before making my decision.
Build Quality and Reliability
For me, durability is important because I want equipment that can handle regular use. I look for a sturdy housing, secure cables, and dependable performance. A power supply should be something I can trust every time I plug in, whether I am rehearsing at home or performing on stage.
Who I Think It Is Best For
I think the MXR Mini Iso Brick is a strong choice for guitarists and bass players who want a compact isolated power supply for a modest-sized pedalboard. It seems best for players who value noise reduction, simple setup, and portability. If someone has a large board with many high-current pedals, I would suggest checking whether they need a larger supply instead.
My Final Thoughts
My overall impression is that the MXR Mini Iso Brick is a practical and space-saving option for powering pedals cleanly. I would consider it if I wanted a dependable unit that helps keep my board organized and quiet. For me, the key is matching the power supply to my actual pedal needs so I can get the best performance from my setup.
Final Thoughts
In my view, the MXR Mini Iso-Brick is a smart choice if I want a compact power supply that still offers plenty of clean, isolated power for a pedalboard. I like that it balances portability with versatility, making it especially useful for players who need reliable performance without taking up too much space. Overall, my takeaway is that it’s a practical, road-ready solution for keeping my pedals powered quietly and consistently.
Author Profile
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Mara Whitcombe is the writer behind MakeUpLondonAcademy.com. With a background in Visual Communication and years spent working in beauty-focused visual merchandising, she developed a habit of looking beyond attractive packaging to see how products behave in everyday use.
Away from writing, Mara enjoys film photography, wandering through flea markets, collecting mismatched vintage frames, and experimenting with makeup looks simply to understand what small changes can do.
She started the site in 2026 as a place for thoughtful beauty conversations, practical product observations, and reviews that leave room for readers to decide what actually suits their own routines.
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