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MXR Iso-Brick Power Supply

4.7 4.7 out of 5 stars 204 ratings

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Purchase options and add-ons

Brand Other
Color Silver
Item Weight 0.5 Pounds
Connector Type barrel connector
Input Voltage 9 Volts

About this item

  • Pedalboard-friendly size
  • Package Dimensions: 16.5 H x 10.2 L x 13.2 W (centimetres)
  • Package Weight: 0.885 kilograms
  • Country of Origin : China
  • Model Number: M238

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MXR Iso-Brick Power Supply
MXR Iso-Brick Power Supply
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Price$169.99-9% $59.99
Typical:$65.99
$39.99-17% $199.99
List:$240.00
-5% $17.99
Typical:$18.99
$169.99
Delivery
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Customer Ratings
Value for money
5.0
4.2
4.5
4.4
4.4
Versatility
4.6
4.2
4.2
4.6
4.0
Sturdiness
4.3
4.0
5.0
4.1
Sold By
Amazon.com
SWHWB
Donner Music
Amazon.com
Hiree
Briskdrop
output voltage
15 volts
5 volts
120 volts
9 volts
connector type
barrel connector
Barrel Connector
Power Cord
model number
11237999616
AS2401A
PP
ogreww-005
43528-156717
weight
0.5 pounds
1.2 pounds
1.4 kilograms

Product information

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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MXR Iso-Brick Power Supply


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Product Description

The MXR iso-brick power supply is small and light with tons of quiet, noise-free DC power on tap ready to run a wide range of pedal types without crowding or weighing down your pedal board. Each of the iso-brick power supply 10 outputs is fully isolated, eliminating gig-ending ground loop noise. Whether analog or digital, positive or negative ground, This power box has you covered. The MXR team broke down These 10 outputs to accommodate a variety of voltage and current requirements: two 9V outputs at 100mA, two 9V outputs at 300mA, two 9V outputs at 450mA, two 18V outputs at 250mA, and two variable outputs adjustable from 6V to 15V at 250mA. The two variable outputs can be used to emulate voltage “sag,” A drained battery effect sought by many vintage tone chasers. On top of all that, the iso-brick power supply comes in a small, lightweight housing that’s built like a tank. Features power on/off and connection status LEDs. Put this little box on your pedal board to make sure it runs reliably and quietly gig after gig. Pedal board-friendly size 10 fully-isolated outputs quiet, noise-free operation powers a wide range of pedal types—digital and analog, positive and negative ground (2) 9V outputs @ 100mA, (2) 9V @ 300mA, (2) 9V @ 450mA, (2) 18V @ 250mA, and (2) variable outputs adjustable from 6V to 15V @ 250mA variable outputs can be used to emulate drained battery effect on/off and connection status LEDs.


From the manufacturer

MXR is a New York-based manufacturer of effects pedals from Rochester. The manufacturer was co-founded in 1972 by Keith Barr and Terry Sherwood and incorporated as MXR Innovations, Inc. in 1974. The MXR is now owned by Jim Dunlop, which continues to produce the original effects units along with new additions to the line.


From the brand

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
204 global ratings

Customers say

Customers like the performance, noise, quality and compactness of the power supply. For example, they mention it works well, it limited hums and it's the best isolated power supply out there. They appreciate the value, appearance, and versatility of the product.

AI-generated from the text of customer reviews

23 customers mention18 positive5 negative

Customers like the performance of the power supply. They mention that it works well, has amazing results, and is a great product.

"working as expected, no noise from the pedals" Read more

"...To be safe I put it on the 450mA output and it works great!Pedals I'm powering:Korg Pitch Black Tuner..." Read more

"...This thing works well...." Read more

"...The MXR M238 unit worked great and is very quiet. Pedals can be very picky and I had trouble with chaining some of the pedals together...." Read more

15 customers mention13 positive2 negative

Customers like the noise of the power supply. They say it has absolutely no noise, a very clean signal, and it limits hums very well. Some say that every effect sounds infinitely better with the M238 and the signal volume is increased naturally.

"working as expected, no noise from the pedals" Read more

"...These all operate noise free and the unit runs cold...." Read more

"...Every effect sounds infinitely better with the M238. Signal volume is increased naturally and the attack and presence of each effect is crystal..." Read more

"...little pickup hum, but my noise gate squashes that completely; no power noise at all)...." Read more

14 customers mention10 positive4 negative

Customers like the quality of the power supply. They say it's a very good power supply, excellent for pedalboards, and has true isolated power output. Some mention that it'll power the Digitech Whammy 5 flawlessly. That said, some are mixed about the quality.

"...see anyone talking about on the internet: it seems to power the Digitech Whammy 5 flawlessly...." Read more

"Perfect for the multi pedal user. This provides solid, isolated power and 2 of the ports are adjustable from around 6v to 18v...." Read more

"...(does not get enough power, power light on pedal dim, audio quality distorts)..." Read more

"...Either way, it is a great power supply and pretty affordable as well." Read more

10 customers mention10 positive0 negative

Customers appreciate the compactness of the power supply. They say it is small, light, versatile, and powerful. Some mention that it is easy to install and doesn't take up a bunch of space.

"...It is very small and pumps a ton of mA compared to similar pedalboard power supplies. It was the one supply that could run my whole board...." Read more

"...Definitely a happy camper now, super easy to install, doesn’t take up a bunch of space & the special part about no noise at all, no pops, squeals or..." Read more

"...was the best option for me, it had enough sockets and the size of the unit worked great for my board." Read more

"...It is smaller and lighter than I expected. This could be due to it's having a wall wart...." Read more

10 customers mention7 positive3 negative

Customers like the sturdiness of the power supply. They mention it's well-constructed, and will hold up well to travel and gigs. Some say the quality is awesome.

"...The unit itself is very sturdy and will hold up well to travel and gigs...." Read more

"Perfect for the multi pedal user. This provides solid, isolated power and 2 of the ports are adjustable from around 6v to 18v...." Read more

"...MXR products I've had have always been sturdy and top notch quality. This thing works well...." Read more

"...Received a replacement and everything works fine. The AC adapter is really flimsy for a $200 product...." Read more

9 customers mention9 positive0 negative

Customers are satisfied with the value of the power supply. They mention that it has the right amount of outputs for the price, and is the most economical choice for an isolated power supply for a decent sized pedal board. Some say that it takes up a bit of space, but is worth it for clean power.

"...Plus, the price was good compared to other similar power units...." Read more

"...Truetone 1spot bricks and this one seemed to have the right amount of outputs for the price. I'm surprised that these don't seem to be more popular...." Read more

"This seemed like the most economical choice for an isolated power supply for a decent sized pedal board...." Read more

"...Either way, it is a great power supply and pretty affordable as well." Read more

8 customers mention6 positive2 negative

Customers like the appearance of the power supply. They mention that it looks good and is nicely designed.

"...it looks cool, 2)..." Read more

"...When I started playing, I noticed a much sharper clean tone as well as an increase in master volumes without touching my knobs...." Read more

"...My only complaint is the unnecessarily bright LEDs, and the outputs are laid out with no kind of reason or forethought...." Read more

"...special part about no noise at all, no pops, squeals or hums, looks really cool with the blue lights to, going to put a blinder on the white light..." Read more

8 customers mention8 positive0 negative

Customers like the versatility of the power supply. They say it has multiple voltage options, a good variety of power options, and is perfect for the multi pedal user. Some mention that the power options are great and there is absolutely no hum.

"...one because it had a large number of outputs (10) with a good variety of power options (the two variable outputs were a real selling point)...." Read more

"Perfect for the multi pedal user. This provides solid, isolated power and 2 of the ports are adjustable from around 6v to 18v...." Read more

"...I like that there are voltage options on the outputs and two outputs for voltage sag...." Read more

"The iso brick is small and light weight.The versatility as great.Dowfall : It seems that I have ground related noise issue...." Read more

Awesome Value and Great Ground Loop Noise Reduction!
5 Stars
Awesome Value and Great Ground Loop Noise Reduction!
I've looked at a lot of the popular power supplies on the market like some of the voodoo labs and Truetone 1spot bricks and this one seemed to have the right amount of outputs for the price. I'm surprised that these don't seem to be more popular. I had some noise before I bought this and now everything is quite and absolutely no noise (still a little pickup hum, but my noise gate squashes that completely; no power noise at all). The LEDs are very bright but I guess that is better than not bright enough. I have a Pedaltrain Pro and the cables were long enough that I was able to string my Time Machine nearly all the way to the opposite corner of the board. I was a little concerned about the "sag" outputs but it seems that you can just set them to 9V and they act as a normal 9V output.Also another huge point that I didn't really see anyone talking about on the internet: it seems to power the Digitech Whammy 5 flawlessly. NOTE: this is the version 5 that is 9VDC from the factory (not the AC older versions). So the original Whammy power brick and input say 1300mA, but the Whammy manual says that it consumes <265mA. I think the adapter is a generic Harmon adapter for many things and so they just want you to use what they already make which happens to be 1300mA max. The pedal will only pull the required amperage from the brick at 9V, which again is <265mA and I'm pretty confident that value is accurate, otherwise it wouldn't be in the manual. To be safe I put it on the 450mA output and it works great!Pedals I'm powering:Korg Pitch Black TunerDigitech Whammy V (DC)Visual Sound Double TroubleVisual Sound Comp 66MXR Smart GateVox Time MachineSwitch Doctor generic amp footswitch with 9VDC powered LEDs
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5.0 out of 5 stars Awesome Value and Great Ground Loop Noise Reduction!
Reviewed in the United States on March 21, 2017
I've looked at a lot of the popular power supplies on the market like some of the voodoo labs and Truetone 1spot bricks and this one seemed to have the right amount of outputs for the price. I'm surprised that these don't seem to be more popular. I had some noise before I bought this and now everything is quite and absolutely no noise (still a little pickup hum, but my noise gate squashes that completely; no power noise at all). The LEDs are very bright but I guess that is better than not bright enough. I have a Pedaltrain Pro and the cables were long enough that I was able to string my Time Machine nearly all the way to the opposite corner of the board. I was a little concerned about the "sag" outputs but it seems that you can just set them to 9V and they act as a normal 9V output.

Also another huge point that I didn't really see anyone talking about on the internet: it seems to power the Digitech Whammy 5 flawlessly. NOTE: this is the version 5 that is 9VDC from the factory (not the AC older versions). So the original Whammy power brick and input say 1300mA, but the Whammy manual says that it consumes <265mA. I think the adapter is a generic Harmon adapter for many things and so they just want you to use what they already make which happens to be 1300mA max. The pedal will only pull the required amperage from the brick at 9V, which again is <265mA and I'm pretty confident that value is accurate, otherwise it wouldn't be in the manual. To be safe I put it on the 450mA output and it works great!

Pedals I'm powering:
Korg Pitch Black Tuner
Digitech Whammy V (DC)
Visual Sound Double Trouble
Visual Sound Comp 66
MXR Smart Gate
Vox Time Machine
Switch Doctor generic amp footswitch with 9VDC powered LEDs
Images in this review
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Customer imageCustomer image
12 people found this helpful
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Reviewed in the United States on October 19, 2022
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5.0 out of 5 stars It’s what you need
Reviewed in the United States on October 19, 2022
I don’t have any boutique pedals, was just having pops & squeals with the daisy chain as I added more pedals.
Definitely a happy camper now, super easy to install, doesn’t take up a bunch of space & the special part about no noise at all, no pops, squeals or hums, looks really cool with the blue lights to, going to put a blinder on the white light on top, almost got sunburned.
If you’re undecided on if it’s worth it, think Simon & Garfunkel, sounds of silence, totally beautiful !!!
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Customer image
2 people found this helpful
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Reviewed in the United States on November 6, 2018
One person found this helpful
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Top reviews from other countries

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Jason
5.0 out of 5 stars Expensive but no issues
Reviewed in Canada on August 2, 2023
Katy
5.0 out of 5 stars Ottimo prodotto
Reviewed in Italy on January 31, 2024
FJ Edwards
5.0 out of 5 stars Qualität, die Spaß macht
Reviewed in Germany on December 3, 2022
Octavio Leyva
5.0 out of 5 stars Dunlop/MXR fan
Reviewed in Mexico on August 26, 2022
Andrew S.
5.0 out of 5 stars An underrated power supply.
Reviewed in Canada on March 4, 2023