Item #1156671 Model #9335

MOTU 24Ao USB/AVB Ethernet Audio Interface Standard


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24 analog outputs with AVB networking support.

Top professionals use MOTU hardware and software every day on hit songs, primetime shows and blockbuster films. The 24Ao is the next interface in their prestigious lineup, offering 24 analog channels in one rack space, AVB audio networking, and large console style mixing with 48 channels and 12 stereo busses to help you achieve the best sound possible.

The 24Ao offers 24 balanced analog outputs in a single rack space with three 8-channel ADAT optical banks, for a total of 72 channels (24 analog plus 48 optical). Use the 24Ao to add analog outputs to your computer, or as a flexible optical expander and mixer, or both. All analog I/O is supplied on multi-channel DB-245 D-sub connectors and Phoenix connectors for convenient, flexible wiring into studio and industrial installations alike.

Ultra-Low I/O Latency
Every digital audio workflow introduces some latency. The only question is, how much? In the case of the 24Ao, the answer is not much at all. In the 24Ao, latency is measured in a handful of samples, from the time an audio single first goes digital to its arrival somewhere like an output, the mixer, or the computer. By keeping latency this low in the hardware, the 24Ao helps minimize latency introduced by your host software.

Audio-Class Compliant USB 2.0
Hi-speed USB 2.0 provides across-the-board compatibility with pretty much all laptops and desktops. The 24Ao is USB audio class compliant, which means you enjoy OS-level USB compatibility and support, including iPad support (with Apple camera connection kit sold separately). Since USB 2.0 devices are compatible with USB 3.0-equipped hosts, your 24Ao interface is a future-proof investment in you studio.

48-Channel Digital Mixing
The 24Ao is equipped with a 48-channel digital mixer designed just like a large format mixing console. The 48 inputs can take signal from anywhere: the physical inputs on the 24Ao interface itself, audio channels from the host software on your computer, audio networking streams, or even mixer outputs. The mixer provides seven stereo aux busses, 3 groups, a reverb bus that can alternately serve as a 4th group, a Main Mix bus and a separate Monitor bus that can serve as a solo bus. In essence: comprehensive and transparent mixing.

Modeled Analog EQ and Compression
British analog mixing consoles are renowned for their musical EQ profiles. The 24Ao meticulously models these classic EQs to give you the very same, magical EQ response found on these coveted desks. Each input channel also provides a classic compressor module with optional peak/RMS operation. Groups and the Main Mix bus are equipped with MOTU's Leveler, an accurate model of the legendary Teletronix LA-2A optical leveling amplifier, known for its unique and highly sought-after Automatic Gain Control (AGC) characteristics.

Matrix Routing and Splitting
With one click on the routing grid, you can route any source signal to any destination. Sources can be analog or digital inputs on the interface, computer channels, mixer bus outputs, or audio network streams from other devices on the network. Destinations include interface outputs, host software inputs, mixer inputs, or any other device (or computer) on the AVB network. You can even split any single input (or stereo pair) to unlimited multiple output destinations.

System Expansion and Audio Networking
Build a network with multiple interfaces and computers using standard ABB switches and networking cable, with ultra-low network latency, even over long cable runs. Stream hundreds of audio channels among devices and computers on the network.

In a nutshell, AVB audio networking gives you two important benefits: one, flexible control of your entire audio system from any web host on the same network—even Wi-Fi devices like an iPad or iPhone, and two, endless possibilities for expanding your system or constructing a customized installation.
Sample rates
  • 44.1, 48, 88.2, 96, 176.4, 192kHz
Analog outputs
  • 24 channels (balanced, DC coupled)
  • 3x DB-25 D-sub and 6x 12-pin Phoenix
  • Max level: +20dBu (digitally adjustable -24 to 0dB)
Digital I/O
  • 3 banks (24 ch.) of ADAT optical at 1x sample rates
  • 3 banks (12 ch.) of SMUX optical at 2x sample rates
Total I/O
  • 24 analog + 48 digital (72 total) at 1x rates
  • 24 analog + 24 digital (48 total) at 2x rates
  • 24 analog + 0 digital (24 total) at 4x rates
Computer I/O
  • 1 x USB 2.0 audio class compliant
  • USB 3.0 and iOS compatible
  • 1 x AVB Ethernet (requires OS X Yosemite)
Sync I/O
  • 1 x word clock in
  • 1 x word clock out
Front panel
  • 5 x switches
  • Menu navigation
  • 324 x 24 pixel LCD for level meters / menu nav
  • 1 x AC power switch
  • International 100–240V autoswitching supply
  • 50–60Hz
  • 0.5A max
System Requirements

  • Mac
  • 1GHz Intel-based Mac or faster
  • 2GB RAM; 4 GB or more recommended
  • Mac OS X version 10.8 or later
  • Available high-speed USB 2.0 or AVB Ethernet port (AVB Ethernet audio interface operation requires OS X Yosemite)
  • A large hard drive (at least 500GB for recording)
  • Windows
  • 1GHz Pentium-based PC compatible or faster
  • 2GB RAM; 4GB or more recommended
  • Windows 8 or later
  • Available high-speed USB 2.0 port
  • A large hard drive (at least 500GB for recording)


  • Same analog design as MOTU's groundbreaking 1248, 8M and 16A audio interfaces
  • 72 simultaneous audio channels
  • 24 high-quality, balanced analog outputs
  • 48 digital channels on three banks of 8-channel ADAT optical
  • Connects to a computer with standard AVB Ethernet or audio class compliant high-speed USB 2.0
  • Onboard DSP with mixing and effects
  • 32-bit floating point processing
  • Modeled vintage effects processing
  • Add up to 5 MOTU interfaces using a MOTU AVB Switch (sold separately)
  • AVB audio networking
  • Matrix routing and splitting
  • Web app control
  • Standalone mixing with wireless control
  • ADAT digital I/O
  • Comprehensive metering
  • Includes AudioDesk workstation software for Mac and Windows