ESI M8U eX MIDI Interface

ESI M8U eX — 16-Port USB 3.0 MIDI Interface with Auto-Detecting Ports

The ESI M8U eX is a USB 3.0 multi-port MIDI interface that delivers 16 fully configurable MIDI ports in a single desktop chassis, replacing traditional 8-in/8-out boxes with a far more flexible routing model. Each of the 16 ports can act as either a MIDI input or a MIDI output, and the unit's automatic detection assigns direction on the fly — a green LED marks an input, red signals an output. For setups running hardware synths, drum machines, and groove boxes, this interface consolidates DIN-MIDI connectivity, USB expansion, and standalone routing into one box.

What Sets This Interface Apart

The headline innovation is ESI's MIDI auto-detection technology, which lets any of the 16 ports switch between input and output without manual configuration. It also doubles as a standalone MIDI Thru and Merge box via a front-panel push button, supporting three preset configurations including a 1-to-15 splitter and a 15-to-1 merger. A built-in 3-port USB 3.0 hub with an included 5V DC power supply turns the interface into a central connection point for dongles, controllers, and USB-powered instruments.

Connectivity and Signal Flow

Port count and direction flexibility determine how much hardware a MIDI interface can serve from a single USB cable to the host computer.

• MIDI Ports: 16 (8 front, 8 rear) — each port auto-detects as input or output, supporting any combination up to 16-in/16-out.
• USB Hub: 3-port USB 3.0 — built into the rear panel, powered by the included 5V DC supply, for dongles, controllers, and USB devices.
• Connectivity to the host computer is handled via USB 3.0 with full USB 2.0 compatibility, enabled by a bottom-mounted DIP switch.

Compatibility and Standalone Operation

Driver-free operation and standalone routing make the unit drop-in friendly across modern DAW setups and hardware-only rigs.

• Class Compliance: 100% class compliant — works without driver installation on Windows 7, 8.1, 10, 11 and macOS (32-bit and 64-bit).
• Standalone Modes: Thru box (1 input to 15 outputs) and Merger (15 inputs to 1 output) — selected via front-panel push button, no computer required.
• Multi-Device Support: Multiple units can run on one computer — DIP switch on the bottom sets the device ID for cascading additional interfaces.

Physical Design and Power

The bronze-coloured desktop chassis fits under a monitor or in a 1U slot with the included rack bracket, and the dual power options keep the interface flexible on stage and in the studio.

• Dimensions for this model are 325 × 145 × 45 mm, allowing for desktop placement or 1U rack integration via the included bracket.
• Power: USB bus powered or 5V DC supply (included) — external supply required for standalone mode and to power the USB hub.
• Bundled Software: Steinberg Cubasis LE — included for iOS sequencing when connecting the interface to an iPhone or iPad.