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MXR® Iso-Brick™ Power Supply
MXR

MXR® Iso-Brick™ Power Supply

Bottom line: The MXR® Iso-Brick™ Power Supply ($179.99 on Amazon as of 2026-10-06): 10 fully isolated outputs kill gig-ending ground loop noise; main trade-off: only two 18V outputs for 18V-hungry pedals.

$179.99

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Buy on Amazon — $179.99 Compare to similar power supplies & cables

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ 10 fully isolated outputs kill gig-ending ground loop noise
  • ✓ Mixes 9V and 18V rails for analog and digital pedals
  • ✓ High-current taps: two 9V outputs at 450mA each
  • ✓ Powers positive or negative ground pedals alike
  • ✓ Compact 0.885kg brick fits under a pedalboard

Cons

  • ✗ Only two 18V outputs for 18V-hungry pedals
  • ✗ Just two outputs reach the top 450mA rating
  • ✗ Mounting brackets not listed in the product details
  • ✗ 10 outputs may fall short on very large boards

Manufacturer 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 pedalboard. Each of the Iso-Brick Power Supply’s 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…

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SpecPicks Verdict

SpecPicks scored MXR® Iso-Brick™ Power Supply using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies & cables category. MXR's power supplies & cables lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for power supplies & cables 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 retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • 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

Full Specifications

BrandMXR
ColorSilver
Amperage450 Milliamps
MaterialAluminum, Metal
Unit Count1.0 Count
Form Factorpedalboard-friendly
Model NumberM238
Input Voltage9 Volts
Connector Typebarrel connector
Item Type NameMXR ISO Brick Power Supply
Output Voltage15 Volts
Package Weight0.885 kilograms
Item Dimensions5.3 x 6.9 x 3.7 inches
Mfr Part NumberM238
Country of OriginChina
Specification MetISO 9001:2008
Enclosure MaterialAluminum, Metal
Package Dimensions16.5 H x 10.2 L x 13.2 W (centimetres)
Connector Type Used on Cablebarrel connector
Global Trade Identification Number00710137086654

Ready to buy?

MXR® Iso-Brick™ Power Supply is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $179.99

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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MXR® Iso-Brick™ Power Supply
$179.99
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