Overview

The MOTU M4 is a four-input, four-output USB-C audio interface that extends the acclaimed M-series platform with additional connectivity for musicians and producers who need more routing flexibility. It shares the same ESS Sabre32 Ultra DAC technology as the M2, delivering an exceptional 120 dB dynamic range on the outputs that provides reference-grade monitoring quality for critical listening and mixing. The front panel features two combination XLR/TRS inputs with high-quality preamps, plus two additional quarter-inch inputs for line-level sources such as synthesizers, drum machines, or the outputs of external preamps. The full-color LCD display provides real-time metering for all input and output channels, and the loopback feature enables flexible audio routing for streaming and podcast workflows. Four balanced outputs allow connection of two pairs of studio monitors or external processing gear, and the dual headphone outputs with independent volume controls are valuable for collaborative sessions. MIDI I/O on the rear panel connects hardware instruments and controllers. Build quality is solid with a sturdy metal enclosure and a clean, functional layout. This interface is ideal for electronic music producers, small studios, and content creators who need more than two inputs and flexible output routing without stepping up to a rack-mount unit. The additional inputs are line-level only, so users requiring more than two microphone inputs will need external preamps.

Audio Interfaces

A four-input interface extending the M-series with ESS Sabre32 DAC quality, dual headphone outputs, four balanced outputs, and additional line inputs for synthesizers and processors.

Instrument Details

$269 Intermediate
Brand MOTU
Type USB Audio Interface
Made In United States
Year 2020
4.8 1 vote

AI Reviews

4.8 /5

The MOTU M4 represents a significant shift in what we expect from desktop interfaces in this price bracket. While many competitors focus on aesthetics, MOTU prioritized the signal path by integrating the ESS Sabre32 Ultra DAC"the same silicon found in their high-end rack units. The result is a startlingly low noise floor and a transparent, wide-open soundstage that makes critical mixing decisions much easier.

The standout physical feature is the full-color LCD metering. Unlike the simple 'halo' LEDs found on rival units, these provide actual visual feedback for gain staging, which is invaluable for preventing digital clipping. The preamps are clean and neutral, capturing transients with impressive accuracy, though they lack the 'analog warmth' some might seek. Build quality is robust, featuring a solid metal chassis and smooth-turning potentiometers that feel built to last.

Playability is bolstered by incredibly low-latency drivers, making software monitoring feel instantaneous. My only minor gripe is the headphone amp; while clear, it can struggle to drive high-impedance studio cans to high volumes. For home studio producers and content creators needing reliable loopback and professional-grade conversion without the four-figure price tag, the M4 is the current benchmark. It's a professional tool that punches well above its weight class.

Category Ratings

Audio Interfaces
4.8
Feb 15, 2026
AI-Generated Review Generated via Google API. This is an automated evaluation, not a consumer review. Learn more
MOTU M4 Screenshot

Added: Feb 12, 2026

motu.com/en-us/products/m-series/m4