MXR Iso-Brick Review: Affordable Isolated Power for Budget-Conscious Players

Written by Tyler Sutherland in Gear

Mxr Iso Brick Review






MXR Iso-Brick Review: Affordable Isolated Power


MXR Iso-Brick Review: Affordable Isolated Power for Budget-Conscious Players

The MXR Iso-Brick delivers isolated pedalboard power at the budget-friendly price point that matters to many players—approximately $130. Ten outputs with isolation on each prevents ground-loop hum, making it a genuine upgrade from ultra-cheap non-isolated supplies. With two high-current 18V outputs, two moderate-current 9V outputs, and six basic 9V outputs, the Iso-Brick serves 8-12 pedal boards competently. While current limitations on some outputs require careful pedal matching, MXR’s build quality and Dunlop heritage ensure durability. For players with smaller boards on tight budgets, the Iso-Brick represents honest value.

Key Features

Mxr Iso Brick

The Iso-Brick configuration optimizes costs through strategic current allocation. Two outputs deliver 18V/500mA for high-demand effects; two provide 9V/300mA for moderate-draw pedals; six offer 9V/100mA for low-current circuits. This hierarchy means budget users gain isolation and multiple outputs without paying for uniform high-current provision.

Electrical isolation on each output prevents ground-loop hum—the fundamental requirement for quiet operation. Unlike single-transformer supplies where all outputs share ground and ground-loop noise couples between pedals, the Iso-Brick guarantees individual isolation on every output. This means digital reverbs won’t introduce noise into analog chains, and expression pedals won’t cause artifacts in modulation effects.

Build quality reflects MXR’s heritage under Dunlop. The chassis is solid and durable; connectors are reliable; power delivery is stable. The Iso-Brick doesn’t feel cheap despite its affordability—it’s honestly constructed equipment designed to survive gigging and touring.

Size is compact and practical. The Iso-Brick measures 7″ x 4.5″ x 2″ and weighs under 2 pounds, making it portable and board-friendly. It mounts under compact pedalboards, sits beside larger rigs, or integrates into road case setups without bulk.

Performance & Reliability

The Iso-Brick delivers functional isolation and silent operation within its design parameters. When pedals are matched appropriately to output current ratings, hum and noise disappear. Digital and analog effects coexist without ground-loop artifacts. The isolation quality isn’t matching $400 premium supplies, but it’s legitimate isolation solving real noise problems.

Current delivery requires understanding design tradeoffs. The two 18V/500mA outputs handle demanding high-voltage effects generously. The two 9V/300mA outputs accommodate moderate-draw pedals. The six 9V/100mA outputs suit lightweight circuits. Exceeding output ratings causes voltage sag and noise; staying within specifications yields clean, stable power.

Long-term reliability is solid. MXR builds durable gear, and the Iso-Brick reflects this heritage. Units tested after years of touring show consistent isolation and power delivery. The design doesn’t feature bells and whistles, but it delivers core functionality reliably.

Who Should Buy the MXR Iso-Brick

The Iso-Brick is ideal for budget-conscious players with 8-12 pedal boards who value isolation but can’t justify $200+ pricing. Players willing to carefully match pedals to available outputs gain genuine isolation benefits without premium costs.

Bedroom experimenters, beginning gigging musicians, and hobbyists benefit from affordable isolation. The Iso-Brick eliminates ground-loop noise plaguing cheap supplies without requiring luxury-tier investment. For many players, this represents the sweet spot between cost and quality.

Gigging musicians with smaller boards appreciate the durability and portability. The compact size and reasonable pricing make the Iso-Brick appealing for musicians juggling multiple gigs on tight budgets. It’s genuinely road-worthy within its design parameters.

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Frequently Asked Questions

Q: How many outputs does the MXR Iso-Brick have?
A: Ten isolated outputs: two at 18V/500mA, two at 9V/300mA, and six at 9V/100mA. Adequate for 8-12 pedal boards when pedals match output ratings.

Q: Why does the Iso-Brick have different current ratings on different outputs?
A: Budget optimization. Higher current provision across all outputs would increase costs significantly. The current hierarchy keeps pricing accessible while providing functional isolation.

Q: Is 100mA enough for a pedal?
A: Most basic 9V pedals draw 50-100mA, so 100mA outlets work. Digital pedals and high-demand effects may exceed this. Match your specific pedals’ current requirements carefully.

Q: Does the Iso-Brick provide true isolation like premium supplies?
A: Yes, functional isolation on each output eliminates ground-loop hum. While not matching per-watt quality of $400+ supplies, it’s legitimate isolation solving real noise problems at budget pricing.

Q: Is the MXR Iso-Brick reliable for gigging?
A: Yes. MXR builds reliable gear, and the Iso-Brick is road-worthy. For small to modest boards with pedals matching output specifications, it delivers solid durability.

Tyler Sutherland

Ty is a guitar player and gear obsessive who started chasing tone the moment he plugged into his first amp. He covers everything from new releases and signature models to hands-on reviews and playing technique at New Guitar Daily. When he's not writing, he's probably swapping pickups or arguing about neck profiles.

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