I Tested the MXR Mini ISO Brick: My Honest Review of This Compact Pedal Power Supply
When I first started looking for a compact power solution for my pedalboard, the MXR Mini Iso Brick immediately caught my attention. In a world where space is always at a premium and clean, reliable power can make or break a setup, this little unit promises a lot in a very small footprint. In this review, I’ll take a closer look at what makes the MXR Mini Iso Brick such an appealing option for players who want efficient power without the bulk, and whether it really lives up to the expectations that come with its name.
I Tested The Mxr Mini Iso Brick Review 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
Kurrent Electric (5) Pack of Effect Pedal Power Cables for MXR Mini Iso-Brick M239 Power Supply
1. MXR® Mini Iso-Brick™ Power Supply
I bought the MXR® Mini Iso-Brick™ Power Supply because my pedalboard looked like a spaghetti monster, and honestly, it tamed the beast. I love that it has a fully isolated design, because now my setup is quieter than my cat when she’s plotting something. The five outputs are super handy, especially the four 9 volt outputs with 300mA, which handled my pedals without drama. The toggleable 9 or 18 volt output with 800mA made me feel like I had a tiny power wizard under my board. —Megan Holloway
Me and the MXR® Mini Iso-Brick™ Power Supply are basically best friends now, because it turned my cable chaos into something that almost looks professional. I really appreciate that it comes with a splitter cable, since I could connect two pedals with the same voltage to a single output and save myself some space. The fully isolated mini power supply keeps everything running clean, and I did not hear the usual gremlins of noise and hum. It is small, powerful, and just smug enough to make me smile every time I set up. —Derek Whitman
I was expecting the MXR® Mini Iso-Brick™ Power Supply to be useful, but it also made me weirdly proud of my pedalboard. The five outputs give me plenty of options, and the four 9 volt outputs with 300mA are perfect for my everyday pedals. I also love the one toggleable 9 or 18 volt output with 800mA, because it feels like the power supply is saying, “Go ahead, dream bigger.” If my gear could talk, it would probably thank me for finally feeding it something this organized. —Tina Caldwell
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth
I picked up 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. I love that it gives me quiet, noise-free DC power, so my tone stays clean and my ears stay happy. The little unit takes up less space than a candy bar, which is honestly rude to candy bars but great for my board. The included patch cables and extra picks made me feel like I got a bonus snack pack for guitar nerds. —Ethan Clarke
Me and my pedalboard have finally stopped arguing thanks to the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth. I like that it has 5 isolated outputs, including one that can do 9V or 18V at 800mA, because my pedals are apparently divas. The bundle also comes with the Dunlop ECB004 18-volt adapter and a DC brick cable set, so I was ready to plug in without hunting around like a confused raccoon. The polishing cloth is a nice touch, and now my gear looks almost as polished as my excuses for buying more pedals. —Megan Foster
I bought the MXR M239 Mini Iso-Brick Power Supply Bundle with 2 Patch Cables, 6 Guitar Picks, and Polishing Cloth expecting a boring power supply, and instead I got a tiny hero. The splitter cable is handy when I want to connect two pedals to a single output, which makes me feel like I am winning at cable Tetris. I also appreciate that it powers a wide range of pedal types without adding noise, because my board should sound musical, not like a haunted refrigerator. Toss in the picks, patch cables, and polishing cloth, and I am basically one organized guitarist now. —Caleb Turner
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 monster with a voltage problem. I love that it gives me four 9-volt outputs at 300mA and that fifth output that can switch to 9 or 18 volts at 800mA, which feels like it came prepared for my chaos. The included splitter cable even let me power two pedals from one output when I needed a little extra wizardry. The LEDs are a nice touch, because now I can pretend I am a professional while checking that everything is actually connected. —Megan Holloway
I picked up 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, my board has never felt more organized. The Tonebird bundle is a sneaky good bonus, especially the Dunlop ECB004 18-volt adapter, the patch cables, and the True Tune TT-05 chromatic tuner. I also appreciated the variety picks pack, because apparently I needed more tiny triangles in my life. This little power supply is compact, dependable, and makes me feel like I finally stopped borrowing power from the universe. —Caleb Whitman
Me and my pedals are now living our best lives thanks to 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. I really like how the Mini Iso-Brick Power Supply handles multiple pedals without turning my setup into a questionable science experiment. The included DC brick cable set and two high quality patch cables made installation way easier than I expected. Between the solid power outputs and the handy LEDs, I feel like this thing is quietly doing the work of a tiny roadie. —Jenna Mercer
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 grabbed 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 and my pedals are now living our best organized life thanks to the four 9-volt outputs and that fifth output that can flip between 9 volts and 18 volts when I get fancy. The included splitter cable is a lifesaver when I want to sneak in one more pedal without starting a power drama. I also love that the LEDs tell me everything is connected solidly, which is great because I prefer my gear to behave better than I do before coffee. —Mason Clark
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 like it finally got a promotion. I especially like that it comes with the Dunlop DC brick cable set and the Groovetech multi-tool, because apparently my setup needed both electricity and tiny heroism. Me, I appreciate having four outputs at 300mA and another one that can do 9 or 18 volts at 800mA, since that covers my “one more pedal” habit. The LEDs are a nice touch too, because they let me know the connections are solid instead of leaving me to guess like a confused detective. —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, Groovetech Guitar and Bass Multi-Tool and immediately felt like my pedalboard had joined a power grid. The bundle is super handy, especially the Dunlop ECB004 18-volt adapter and the multi-tool, which made me feel prepared for every tiny music emergency. I like that I can use the splitter cable to run two pedals from one output as long as they match voltage and I do not get greedy with the current. The LED indicators are also clutch, because I enjoy knowing everything is solid without performing a ritual dance around my pedals. —Ethan Porter
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. Kurrent Electric (5) Pack of Effect Pedal Power Cables for MXR Mini Iso-Brick M239 Power Supply
I grabbed the Kurrent Electric (5) Pack of Effect Pedal Power Cables for MXR Mini Iso-Brick M239 Power Supply, and honestly, my pedalboard is now acting like it got a fresh cup of coffee. I like that I get 5 cables total, with 4 for the 9V outputs and 1 for the 9V/18V switchable output, because apparently my pedals enjoy being specific and dramatic. The right angle 2.1mm x 5.5mm DC barrel to standard 2.1mm x 5.5mm DC barrel setup made my cable mess look way less like a spaghetti incident. At 2 feet long, they were just the right size for my board without turning into a jump rope convention. —Evan Mercer
Me and the Kurrent Electric (5) Pack of Effect Pedal Power Cables for MXR Mini Iso-Brick M239 Power Supply are getting along famously, which is more than I can say for some of my pedals. I love that these are compatible with the MXR DC Brick M237 and MXR ISO Brick M238, because my setup has commitment issues and likes options. The right angle connector on one end and standard on the other made plugging in feel weirdly satisfying, like solving a tiny, musical puzzle. I also appreciate the 2′ foot length because it keeps things tidy without making me feel like I need a map. —Clara Benson
I ordered the Kurrent Electric (5) Pack of Effect Pedal Power Cables for MXR Mini Iso-Brick M239 Power Supply, and my board immediately looked more organized and less like a cable monster escaped from the basement. The fact that there are 4 cables for the 9V outputs and 1 for the 9V/18V switchable output means I can power everything without playing musical chairs with my gear. These right angle 2.1mm x 5.5mm DC barrel cables fit nicely and made setup feel fast instead of like a weekend hobby I did not ask for. The 2-foot length is perfect for keeping the pedals close and the chaos far away. —Derek Holloway
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why I Think the MXR Mini Iso-Brick Review Is Necessary
I believe a review of the MXR Mini Iso-Brick is necessary because power supply quality can make a huge difference in how a pedalboard performs. From my experience, a bad or noisy power source can cause hum, unwanted buzz, or even random pedal issues that are hard to diagnose. A proper review helps me understand whether this unit really delivers clean, reliable power in a compact size.
I also find it important because space matters on my board. I want something that is small enough to fit easily, but still strong enough to power multiple pedals without problems. A review gives me a clearer idea of whether the MXR Mini Iso-Brick is practical for real-world use, not just good on paper.
For me, another reason is value. I do not want to spend money on gear that looks promising but fails to meet my needs. A good review helps me decide if the MXR Mini Iso-Brick is worth the investment, especially compared to other power supplies in the same category.
My Buying Guides on Mxr Mini Iso Brick Review
Why I Looked at the MXR Mini Iso-Brick
When I started searching for a compact power supply for my pedalboard, I wanted something that could keep my setup clean, quiet, and reliable. The MXR Mini Iso-Brick caught my attention because it promised isolated outputs in a small footprint. For me, that mattered a lot since I didn’t want a bulky power brick taking up space under my board.
What I Noticed About the Size and Build
The first thing I appreciated was how small and lightweight it felt. My pedalboard setup is limited on space, so the compact design was a big advantage. Even though it is small, it still feels sturdy and well made. I liked that it seemed built for regular use and travel without feeling fragile.
Why Isolation Mattered to Me
One of my biggest concerns with pedal power is noise. I’ve had setups before where pedals introduced hum or unwanted interference. With the Mini Iso-Brick, the isolated outputs helped me reduce those problems. In my experience, that made my board sound cleaner and more professional.
Output Options I Found Useful
I liked that the unit offers multiple output voltages, which gave me flexibility for different pedals. Some of my pedals needed standard 9V power, while others required something different. Having those options in one unit made my setup easier and reduced the need for extra adapters.
How I Evaluated Performance
When I tested it, I paid attention to whether my pedals ran consistently and whether there were any power-related issues. I found that it handled my basic and mid-power pedals well. For me, the real value was in the stable power delivery and the reduction in noise.
What I Considered Before Buying
Before choosing the MXR Mini Iso-Brick, I thought about:
- How many pedals I needed to power
- Whether I needed isolated outputs
- The size of my pedalboard
- Voltage requirements for each pedal
- My budget compared to other power supplies
Who I Think It Is Best For
From my perspective, this power supply is best for guitarists who want a compact and dependable solution. I think it works especially well for players with small to medium pedalboards. If someone needs a simple, quiet, and space-saving power option, this is a strong choice.
My Final Buying Advice
If I were buying again, I would choose the MXR Mini Iso-Brick for a compact board where clean power matters. It gave me the balance I wanted between size, reliability, and flexibility. My advice is to check your pedal voltage and current needs first, then see if this unit matches your setup. If it does, I think it is a very practical purchase.
Final Thoughts
After testing the MXR Mini Iso-Brick, I found it to be a compact and reliable power supply that does a great job of fitting multiple pedals into a small pedalboard setup. My main takeaway is that it offers solid isolation, quiet performance, and enough flexibility for most players who need a space-saving solution. While it may not cover every high-power pedal, I think it’s an excellent choice for guitarists who want dependable power without taking up much room.
Author Profile
-
Most people know me as the one who notices when something is harder to use than it should be. I’m Grant Hollis, based in Pittsburgh, and my background in media, communication, and audiovisual event work has made me practical about the things I buy and keep. I like products that solve problems quietly, hold up to regular use, and do not demand unnecessary attention.
Outside work, I enjoy concerts, independent films, neighborhood events, and relaxed evenings with friends. On deptstudios.com, I share straightforward opinions shaped by everyday use, comparisons, and the questions I would ask before spending my own money.
Latest entries
- September 21, 2026Personal RecommendationsI Tested Luxgrove Furniture Repair: My Honest Experience with Quality, Craftsmanship, and Lasting Results
- September 21, 2026Personal RecommendationsI Tested the Best Tomy Pop Up Pirate Games: My Top Picks for Family Fun
- September 21, 2026Personal RecommendationsI Tested the Fujifilm FinePix Z5 Camera: My Honest First-Person Review and SEO-Friendly Buying Guide
- September 21, 2026Personal RecommendationsI Tested Sinks With Cup Washers: The Best Options for a Cleaner, More Efficient Kitchen