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🎸 Power your sound, own the stage with MXR M239 ISO Brick Mini!
The MXR M239 ISO Brick Mini Power Supply is a compact, 2 Amp regulated power source designed specifically for guitar pedals. Featuring an 18V input and a standard 5.5mm x 2.1mm positive barrel plug, it delivers 9V DC output with 14.4 Watts of power. Lightweight and durable, it’s FCC certified and highly rated by musicians for reliable, noise-free performance on any pedalboard.





| Amperage | 300 Milliamps |
| Asin | B07KPM6QHT |
| Best Sellers Rank | 14,775 in Musical Instruments & DJ (See Top 100 in Musical Instruments & DJ) 111 in Guitar Pedal Power Supplies |
| Box Contents | Splitterkabel |
| Brand Name | MXR |
| Colour | black |
| Connector Types | 20+4 Pin ATX |
| Country Of Origin | China |
| Customer Reviews | 4.6 4.6 out of 5 stars (413) 4.6 out of 5 stars |
| Enclosure Material | Lightweight and durable material, possibly aluminum or high-quality plastic |
| Form Factor | compact |
| Input Voltage | 18 Volts (DC) |
| Item Dimensions | 27.4 x 12.4 x 8.9 centimetres |
| Item Type Name | Electric Guitar Effects |
| Item Weight | 70 Grams |
| Manufacturer | MXR |
| Manufacturer Part Number | M239 |
| Maximum Power | 14.4 Watts |
| Model Number | M239 |
| Output Current | 2 Amps |
| Output Voltage | 9 Volts (DC) |
| Output Wattage | 14.4 Watts |
| Specification Met | FCC |
| Upc | 710137108165 |
User
Very happy!
Low noise and so small!Greta quality!No issues! :)))
User
Great Quality
A really well made piece of kit from MXR,compact,light but sturdy.It works really well and is silent in use even with high gain pedals............highly recommended.
User
Absolutely brilliant and fits under my Pedaltrain really well
I bought this because I heard it fits nicely under a PedalTrain Metro board and it does. So well, in fact, that after I bought the first one, I bought another immediately after so I can power up to 12 pedals.Feels really robust, is really simple to use. I'd never realised that a few of my pedals (e.g. my Boss RV-5) weren't getting enough power.The only downside for me is that the power cord has a bigger plastic bit on it that feels like it's always in the wrong place for my pedal board and that it might get crunched under the weight, but that's up to me to affix it properly in a way that it won't.
User
Job Done!
No nonsense, tiny, solid and comes with all the leads you need.I've rehearsed and gigged with this and it's been spot on.Totally recommended .
User
Great power supply but not so great for fuzz
This is a perfect power supply for small boards I really like it, only issue I came across was when using vintage style fuzz pedals especially units with silicone transistors, I’ve found if you use the 18v outlet for any pedal on the board it introduces a siren type sound to my fuzz pedal when I switch it on, i run my fuzz on battery! the only way to eliminate the sound is to disconnect the 18v/9v output completely which is annoying as it’s one less pedal on the board.It’s a great unit so I’m happy to live with that minor issue.
User
Surprisingly Smol!
Yes, I know it says mini-brick right on the box, but I still wasn’t prepared for how dinky this power supply is, I’ve only ever owned a couple of cheaper pedal power supplies, and though they did work, I’ve was never truly convinced they were ‘isolated’ or indeed that ‘safe’.When my last £30 one overheated the PSU when it was powering four pedals out of a claimed max of eight (with the aroma I hadn’t enjoyed since the 1970s Scalextric era!) I thought maybe I should invest in something that wasn't made so cheaply for a change. And here I am!Initial impressions are it is very nicely made, especially for something that is most likely going to be hidden away. All brushed aluminium and Apple inspired packaging. The dimensions are fantastically miniature, as the photo shows, and a lot smaller than the army of pedal clone PSUs all over your Amazon search.I suppose it is expensive for what it is. And there are definitely even more solid options at a slightly higher price that don’t use an external power supply, this point might be a deal breaker for some. But for me, a bedroom musician, it’s perfect, unobtrusive, silent, and gives me a little assurance that I won’t be frying my favourite pedals. Very pleased.
User
I must have had a bad one!
Firstly the good: Before I got an amp modelling pedal, it was great! It was easy to install under my nano+ board with hook and loop tape, and the cables supplied were just the right length and of nice quality. There was no noticeable noise with delay, reverb and chorus pedals - and it powered my RC-5 looper without any fuss. The problem started 3 weeks after I installed it, when I got a UAFX dream 65 amp modelling pedal. This needs 400ma, so I used the only output capable of this (other outputs 300ma) which is the switchable voltage one also used for adding another iso mini brick. This was obviously set to 9v. The UAFX had noticeable pickup whine, high pitched - it only stopped when the strings were held. I tried swapping guitars, adjusting the pickup height etc - I was convinced it couldn’t be the power supply because the MXR iso is supposed to be isolated and designed for this purpose. In the end I tried a Boss 500ma charger straight into the UAFX and it totally solved the problem. I’m no where near the milliamp limit for the iso brick, so it must be either faulty or not fit for purpose. So back it to Amazon it went, which I hate doing. It has been replaced by a Cioks SOL- which is totally noiseless - but around £50 more in price. The MXR is a nice looking and compact piece of kit - it’s such a shame about the noise on my example
User
Good But Expensive
Got this to power a pedal board. I had hoped this would fix some noise issues I had with a set of pedals that I won, but it made no difference. However used for my main pedals, Boss, Digitech, and it is fine. Small enough for a medium sized board. Leads provided to power up to 6 pedals. I would probably try a cheaper brand next time to see if there is any difference, but it is certainly a good quality item.
User
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.
User
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.
User
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.
User
Ottimo
Funziona benone ed con le sue dimensioni ridotte sta in qualsiasi pedaliera
User
Compact and Noise-free
Compact pedal power supply at its best! No noise.
Trustpilot
4 days ago
2 months ago