Audio Interface

MOTU 1248 Audio Interface

The MOTU 1248 strikes a balance between analog connectivity and digital expansion, offering four premium mic preamps, six analog outputs, and two banks of ADAT optical for up to 32 channels of I/O. Thunderbolt, USB, and AVB networking provide flexible computer and network connectivity, while the onboard 48-input DSP mixer with EQ, dynamics, and reverb handles monitor mixing without loading the host. A versatile centerpiece for medium-scale playback and IEM rigs that need both analog I/O and digital expansion.

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Discontinued. MOTU AVB-era interface gone from major retail 2026-07 — superseded by the 2024+ line (828/16A TB4/848). Kept for owners; used-market staple.

Photos

Manufacturer product photography — the drawn faceplate stays true to panel layout; these show the hardware itself.

MOTU 1248 Audio Interface — Photo: MOTU1 / 2

Documented outputs: 88 destination connections
Documented inputs: 6Based on documented inputs
Rack space: 1UBuilder checks available rail space
Power draw: 30W40W documented maximum
Catalog estimate: ~$1,999Use retailer rows for current price and stock

01 · What it does—and what that changes in your rig.

Product overview

Start with the payoff, then work through how it functions, where it fits, and the details that change a real build.

The payoff

Audio Interface decisions, organized around the whole rig.

The MOTU 1248 is a full-rack-unit audio interface built to sit at the center of a medium-scale IEM or playback rig. Its value proposition is breadth without bulk: four mic preamps, six analog TRS outputs, word clock I/O, two AVB network ports, and ADAT expansion that can push the system to 32 channels, all in a single 1U box. The onboard 48-input DSP mixer — with EQ, dynamics, and reverb — means the box can handle monitor mixing duties even when it's not tethered to a host computer, which matters enormously in a live context where the laptop is a liability rather than a certainty.

Documented outputs: 88 destination connections
Documented inputs: 6Based on documented inputs
Rack space: 1UBuilder checks available rail space

MOTU 1248 Audio Interface — rear panel — Photo: MOTU1U · 30W

Function

How it works in the path

At load-in, the connectivity picture looks like this: you can feed four mics directly without an outboard preamp stage, run six discrete analog feeds to ears or outboard gear, and daisy-chain ADAT expanders if the show demands more inputs or outputs. The two AVB ports let you put this unit on a network with compatible gear — useful if you're routing audio across multiple rack positions or sharing sources with FOH. Thunderbolt and USB-C both present as host options, so you're not locked to one cable standard or one computer ecosystem. At 30 watts nominal draw, it's easy to budget on a standard single-rack conditioner.

Best fit

Where it earns its place in the rack

This unit fits best with a playback operator or monitor engineer who needs a real DSP mixer on the road and wants the option to expand via ADAT rather than buying a bigger box upfront. The four onboard preamps make it credible for a hybrid role — tracks plus some live inputs — but it is not a front-of-house console replacement, and engineers running large channel counts on a touring IEM rig will likely outgrow the analog I/O quickly and lean on the ADAT expansion heavily. If your world is entirely analog with no network ambitions, simpler interfaces exist for less. If you need Dante instead of AVB, look elsewhere.

In the rack

Details worth deciding before load-in.

Route your most critical monitor mixes through the six analog TRS outputs first — they're your lowest-latency, most reliable path when the network has a bad night.
Use the onboard DSP mixer to pre-build a standalone monitor scene before the host laptop is even connected; if the computer crashes mid-show, the 1248 keeps passing audio and the DSP mix stays up.
If you're adding ADAT expanders for more inputs, confirm sample-rate requirements before load-in — ADAT channel count halves at 96 kHz, so a 32-channel rig at 44.1/48 kHz becomes a 16-channel rig if the show runs at high sample rates.
The two AVB ports can be used for daisy-chaining on an AVB network without an external switch for simple two-device setups, which can save a rack shelf and a power drop on a tight fly rig.

02 · Know the whole path before you buy.

Signal path

Learn the route as a block diagram: source, product function, transport, and destination. Select any block to see what enters, what changes, and what leaves.

Interactive block diagramAuto-looping · hover, focus, or tap to hold a stage

Port-type signalProduct functionSystem boundary

Follow one signal from source to destination

Each block answers the same three questions: what arrives, what changes here, and what leaves.

01 · Source · selected

01 · Source

6 documented inputs

XLR female + bnc

Arrives as: 6 documented inputs
Connector: XLR female + bnc
Signal: analog audio

03 · What this product asks of the rest of the system.

Compatibility

Treat connector names as the start of the check—not the answer. These are the boundaries that determine a complete working path.

Best fit · Audio Interface

Use it when 1U and 229 mm of depth fit the case.

Plan the companion path

Complete the path with upstream and downstream gear that matches connector, direction, signal type, protocol, and wiring standard.

Connector boundary

Documented connectors: XLR female, ¼-inch TRS, RJ45, thunderbolt. Match connector, direction, and signal type—not shape alone.

04 · Every connector, grouped by job.

I/O ports

Switch the product view and the documented port inventory updates with it—hardware and data stay side by side.

Every connector, grouped by job.

Switch panels to keep the hardware view and the documented port list in sync.

Panel view

Front panel

Rear panel

All documented ports for MOTU 1248 Audio Interface
Port	Panel	Connector	Direction	Signal	Channels
Mic In 1 (XLR)	rear	XLR female	input	analog audio	—
Mic In 2 (XLR)	rear	XLR female	input	analog audio	—
Mic In 3 (XLR)	rear	XLR female	input	analog audio	—
Mic In 4 (XLR)	rear	XLR female	input	analog audio	—
Main Out L (TRS)	rear	¼-inch TRS	output	analog audio	—
Main Out R (TRS)	rear	¼-inch TRS	output	analog audio	—
Analog Out 3 (TRS)	rear	¼-inch TRS	output	analog audio	—
Analog Out 4 (TRS)	rear	¼-inch TRS	output	analog audio	—
Analog Out 5 (TRS)	rear	¼-inch TRS	output	analog audio	—
Analog Out 6 (TRS)	rear	¼-inch TRS	output	analog audio	—
Headphone Out (TRS)	rear	¼-inch TRS	output	analog audio	—
AVB Network 1 (RJ45)	rear	RJ45	bidirectional	digital audio	—
AVB Network 2 (RJ45)	rear	RJ45	bidirectional	digital audio	—
Thunderbolt	rear	thunderbolt	bidirectional	data	—
USB-C	rear	usb c	bidirectional	data	—
Word Clock In (BNC)	rear	bnc	input	digital audio	—
Word Clock Out (BNC)	rear	bnc	output	digital audio	—
Power (IEC)	rear	IEC C14	input	power	—

Showing 18 of 18 documented physical ports. Scroll to review the remaining rows.

05 · Compare the decision, not just the price.

Alternatives

The rows are organized around fit, power, I/O, and system role so a cheaper unit cannot hide a more expensive workflow.

Compare	MOTU 1248 Audio InterfaceThis gear	MOTU 112D Audio Interface	MOTU 24Ai Audio Interface	MOTU 24Ao Audio Interface
Fit	📐 1U	📐 1U	📐 1U	📐 1U
Power	⚡ 30W	⚡ 30W	⚡ 25W	⚡ 25W
Weight	⚖️ 6.4 lb	⚖️ 6.4 lb	⚖️ 6.0 lb	⚖️ 6.0 lb
I/O	🔌 18	🔌 13	🔌 9	🔌 9
Estimate	💵 ~$1,999	💵 ~$2,495	💵 ~$1,995	💵 ~$1,995
Deep dive	Current selection	Full comparison →	Full comparison →	Full comparison →

06 · Resolve the questions that can change the purchase or build plan.

Planning questions

Short, source-backed answers surface rack fit, power, cabling, and connection details before they become surprises.

How will the MOTU 1248 Audio Interface affect rack fit and case depth?

It occupies 1U. Its documented depth is 229 mm.

How much power does the MOTU 1248 Audio Interface draw?

Typical draw is 30W and documented maximum draw is 40W.

What connections does the MOTU 1248 Audio Interface have?

18 documented physical ports, including Mic In 1 (XLR), Mic In 2 (XLR), Mic In 3 (XLR), Mic In 4 (XLR), Main Out L (TRS), Main Out R (TRS).

Is the MOTU 1248 Audio Interface discontinued?

MOTU AVB-era interface gone from major retail 2026-07 — superseded by the 2024+ line (828/16A TB4/848). Kept for owners; used-market staple.

07 · See this unit inside a real rack plan.

Builder preview

Placement is only the start. Builder checks space · depth · weight, power headroom, dependencies, and compatible signal paths around this exact catalog item.Open in Builder

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Planning guides for audio interface systems.

Workflow · 7 min

Picking an Audio Interface for a Live IEM Rig

How to choose between a digital mixer, a Thunderbolt interface, and a Dante converter as the brain of your IEM rack — with concrete picks at each tier.

Workflow · 14 min

Building a Click + Tracks Playback Rig: From Laptop to Multi-Output Interface

How to build a live-performance playback rig that runs click + backing tracks reliably — interface sizing, routing rules, software comparison, and what to do when the laptop crashes.

Workflow · 12 min

Redundant Playback: Two Laptops, an Auto-Switching Interface, and Why You Need One

How to build a fail-safe live playback rig with primary + backup laptops, an auto-switching audio interface, and a failover workflow you can actually trust on a Sunday morning.

Workflow · 11 min

SMPTE Timecode for Worship and Touring: Locking Tracks, Lights, and Video

LTC vs MTC vs MIDI Clock, how to generate timecode from Ableton or Playback, how lighting and video receive it, and the frame-rate mistake that drifts every show.

Photos

Product overview

Audio Interface decisions, organized around the whole rig.

How it works in the path

Where it earns its place in the rack

Signal path

6 documented inputs

Compatibility

Best fit · Audio Interface

Plan the companion path

Connector boundary

I/O ports

Every connector, grouped by job.

Alternatives

Planning questions

Builder preview

Universal Audio Apollo x16 Gen 2

RME Fireface UFX III

MOTU M4 Audio Interface

MOTU 16A Audio Interface

MOTU 24Ao Audio Interface

MOTU 24Ai Audio Interface

Related articles

Picking an Audio Interface for a Live IEM Rig

Building a Click + Tracks Playback Rig: From Laptop to Multi-Output Interface

Redundant Playback: Two Laptops, an Auto-Switching Interface, and Why You Need One

SMPTE Timecode for Worship and Touring: Locking Tracks, Lights, and Video