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🎸 Power your pedalboard like a pro—compact, quiet, and built to perform.
The MXR Mini Iso-Brick Power Supply is a compact, stainless steel unit delivering five fully isolated DC outputs—four fixed 9V/300mA and one toggleable 9V or 18V/800mA output. Designed to eliminate noise and ground loops, it includes a splitter cable for powering multiple pedals from a single output. Lightweight yet durable, it’s ideal for professional musicians seeking reliable, quiet power in a minimal footprint.





| ASIN | B07KPM6QHT |
| Amperage | 300 milliamps |
| Best Sellers Rank | #5,749 in Musical Instruments ( See Top 100 in Musical Instruments ) #36 in Guitar & Bass Pedal Boards & Cases |
| Brand | MXR |
| Color | black |
| Connector Type | 20+4 Pin ATX |
| Connector Type Used on Cable | 20+4 Pin ATX |
| Customer Reviews | 4.6 out of 5 stars 418 Reviews |
| Enclosure Material | Stainless Steel |
| Form Factor | compact |
| Input Voltage | 18 volts_of_direct_current |
| Item Dimensions | 10.79 x 4.88 x 3.5 inches |
| Item Type Name | Power Supply |
| Item Weight | 70 g |
| Manufacturer | Jim Dunlop |
| Material | Stainless Steel |
| Mfr Part Number | M239 |
| Model Number | M239 |
| Output Current | 800 milliamps |
| Output Wattage | 14.4 watts |
| Specification Met | FCC |
| UPC | 710137108165 |
| Warranty Description | Dunlop manufacturing, inc. Will repair or replace, at its discretion, defective workmanship or materials on all new dunlop electronics directly or through the selling dealer or authorized service technician, for one year from the date of purchase, at no cost to the original purchaser. Repair or replacement parts installed will then be warrantied for the unexpired portion of the original warranty t… |
N**S
Small, lots of power. Well-made.
This is my third MXR power supply, but my first Mini ISO-Brick. Has lots of power. I haven't yet run into a pedal this underpowers. Fits nicely under most boards, comes with all the cables you're likely to need.
B**N
The only way to beat this MXR Mini ISO is to spend 250% more!
For the power that it offers and its size and construction you cannot spend your money any better than this. And if you can find it on sale, even better. Because of the 9 V outlets 350 mA power reserves along with the 18 V having 800 mA of power, you have all the power you need! In my case, I have three 18 V pedals two of which needed 300 mA each, with the other requiring 100 mA. It runs them flawlessly and quietly using a 3 way power cable. That cable, I had to buy separately. It comes with most of the cables you need, including a splitter to run two pedals from a single outlet. Because of the 350 mA of power coming from a single 9 V outlet, you can even daisy chain pedals together from a single outlet as long as you calculate the number of milliamps your pedals need. I only daisy chain my analog pedals. The digital ones I tend to isolate. The only other power supply, I would even consider, is the Cioks DC7. Check it out if you need other voltages. Each power outlet can be configured for four different voltages, and it has tons of reserve power. However, it costs over twice as much as the MXR, but you will not be disappointed.
D**H
Light weight, well made, great brand
Plenty of power and you can daisy chain another one into the 18v slot if you need more slots. Super compact and fits under my board with ease. I am a big fan of Dunlop/MXR stuff; it’s durable and dependable. I’d say they are a working musicians dream. There are cheaper options but there isn’t a thing I trust more in this price range.
A**R
Compact size
This little iso brick is the perfect size for a small pedal board. It doesn’t take up much space. It has 9v and 18v capabilities. I’ve been using it regularly for about 2 years with no issues.
L**S
Awesome powersupply
love these, comes withs so much adapters ill never use sadly
R**L
Great power supply
This power supply is perfect for my acoustic pedal board. All of the cables are included plus 1 extra “Y” cable to run from the power supply to 2 pedals. I use all 5 of the outputs and have no issues. It is quiet, tiny, and does not affect the sound of my guitar.
H**N
Quality and Clean
Build quality is amazing as always. Design is clean and functional. The 18v power supply is pretty chunky in size so be prepared to make room for it. Great product overall.
A**N
Transformer lasted 3~ years
Love the 18v and extra amperage options. Gigged this power supply on the same board without removing for 3+ years, probably around 500 gigs. Transformer finally quit on me (no voltage showing on multimeter). Thankfully I had my backup OneSpot. Ordered another power supply as this one was out of the one-year warranty. Decent longevity, but consider buying a backup transformer- hopefully my brick is still good when I plug the new one in.
W**M
Perfect power supply
This is one of the best power supply I ever had, I already got 4 of these powering my multiple rigs, recently I made a new pedalboard and definitely was my first choice. It supplies 100% isolated power through its ports, very quiet, zero noise, reasonable price, small in size so it takes no space if placed on top of the pedalboard neither if below it. Also does not require any special tools or accessories to hang it below the pedalboard, I added a velcro and it hangs there for ages. Only down fall is the power supply jack gets easily disconnected from the unit with any movement. I solved this with a zip tie, I tied the adapter wire with a zip tie to the pedalboard thus it doesn't get affected if any movement.
T**N
Great product
Small size means it fits under pedalboard easily. Works really well and very easy to set up. Switches off automatically after a while too. Highly recommend if you use pedals regularly.
D**Y
Very happy!
Low noise and so small! Greta quality! No issues! :)))
C**N
Producto dañado. Amazon perfecto
El producto llego dañado. Una de las entradas no funcionaba y no me percaté de ello hasta diciembre. Sin embargo Amazon ha procedido a devolverme el importe sin tener en cuenta que han transcurrido 4 meses.
R**O
Ottimo
Funziona benone ed con le sue dimensioni ridotte sta in qualsiasi pedaliera
Trustpilot
3 weeks ago
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