Dunlop positioned the MXR ISO-Brick (M238-U) as a compact, pedalboard-friendly power supply within the MXR effects accessory line. It was designed to power multi-effect rigs from a single unit while keeping noise out of the signal chain through dedicated isolation circuitry.

The ISO-Brick provides ten fully isolated outputs covering a range of voltages and current ratings: two variable 6–15V outputs at 250mA, two 18V outputs at 250mA, two 9V outputs at 450mA, two 9V outputs at 300mA, and two 9V outputs at 100mA. The unit runs from an 18V regulated supply at 2 amps, fed via a 5.5mm × 2.1mm barrel connector with positive barrel and negative center polarity. Noise-reduction circuitry is built in to maintain quiet operation across all outputs.

Owners sourcing a replacement input supply should confirm the 18V regulated rating, 2-amp minimum current draw, and the 5.5mm × 2.1mm positive-barrel connector before substituting any third-party adapter. For questions about output wiring, connector compatibility, or integration with specific effects units, consult a qualified electronics technician or guitar technician familiar with pedalboard power systems.