MXR
® Mini Iso-Brick™ Power Supply
*Price sourced from Amazon.com. Last updated 2026-05-26. Price and availability subject to change.
Bottom line: The ® Mini Iso-Brick™ Power Supply is a category leader on buyer feedback in the power protection category, priced around $105.99, rated 4.6★ across 405 verified Amazon reviews. A confident buy for most shoppers in this category.
The Mini Iso-Brick Power Supply supplies quiet, noise-free DC power to wide range of pedal types while taking up less space than a candy bar. Whether you need a space-saving solution for your downsized travel board or you just need to power a small, carefully curated selection of tried-and-true staples, this little box has what you need. First, let’s talk outputs. The Mini Iso-Brick Power Supply has five, and each is fully isolated to eliminate obnoxious, gig-ending ground loop noise. Four of the outputs supply 9 volts of power at 300mA, while a fifth can be set to provide either 9 volts or…
SpecPicks Verdict
SpecPicks classifies MXR® Mini Iso-Brick™ Power Supply as a category leader on buyer feedback in the power protection category, based on 405 verified Amazon reviews and our ranking model that weights rating × review-volume × price-fit. MXR's positioning sits comfortably above the category median. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for power protection of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Highly rated — 4.6★ average across customer reviews
- ✓ Fully isolated mini power supply
- ✓ Backed by MXR's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Key Features
- Fully isolated mini power supply
- Has a total of 5 outputs
- Four (4) 9 volt outputs with 300mA of current
- One (1) toggleable 9 or 18 volt output with 800mA of current
- Comes with a splitter cable that can be used to connect two pedals with the same voltage to a single output
- Model Number: M239
Full Specifications
| Brand | MXR |
|---|---|
| Color | black |
| Amperage | 300 Milliamps |
| Material | Stainless Steel |
| Form Factor | compact |
| Model Number | M239 |
| Input Voltage | 18 Volts (DC) |
| Connector Type | 20+4 Pin ATX |
| Item Type Name | Power Supply |
| Output Current | 800 Amps |
| Output Wattage | 14.4 Watts |
| Item Dimensions | 10.79 x 4.88 x 3.5 inches |
| Mfr Part Number | M239 |
| Specification Met | FCC |
Ready to buy?
MXR® Mini Iso-Brick™ Power Supply is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-05-26. Price and availability subject to change.
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