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Motu 24Ai 24-channel USB/AVB Ethernet Audio Interface

48x24 I/O audio interface with 24 analog in, 48-ch mixing, and AVB networking

Key Features:

  • Superb audio quality
  • 72 simultaneous audio channels
  • Universal connectivity
  • On-board DSP with mixing and effects 
  • 32-bit floating point processing
  • Modeled vintage effects processing

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    Product Code: 100275778

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    The 24Ai is a USB audio interface offering 24 channels of high-quality analog audio input or output in a single rack space, combined with three banks of ADAT optical, for a total of 72 channels of I/O.


    24 channels of analog
    All analog I/O is supplied on standard DB-25 D-sub connectors or 12-pin Phoenix (Euroblock) connectors for studio and industrial installations alike. Similar to the 1248, 8M and 16A, the 24Ai and 24Ao are equipped with DSP-driven mixing/effects and AVB Ethernet. With all five AVB interface models, you can mix and match complementary I/O configurations and unify operation on their shared AVB audio networking platform.

    Universal connectivity with expansion and networking
    The new 24Ai and 24Ao connect to a computer through universally compatible USB 2.0, which provides more than enough bandwidth for 24 analog channels, even for a system that includes both a 24Ai (24 analog inputs) and a 24Ao (24 analog outputs). For expanded systems, you could employ a Thunderbolt-equipped interface, such as the 16A, for 256-channel computer I/O, with the 24Ai and 24Ao units connected through AVB networking, which supports hundreds of network channels. All devices on such a network can stream audio to and from the computer, and everything can be controlled simultaneously from any computers, tablets, and smart phones connected to the network.

    A shared technology platform
    The 24Ai and 24Ao share the same extensive feature set and technology platform as the 1248, 8M and 16A, including very high quality analog performance, digitally controlled analog trim on analog inputs, 32-bit DAC trim on analog outputs, 48-channel mixing modeled after large format mixing consoles, DSP effects with 32-bit floating point precision, flexible matrix-style routing and splitting, stand-alone operation, Wi-Fi control, and industry-standard AVB networking with sub-millisecond network latency.

    Technical Specifications

    Sample rates 44.1, 48, 88.2, 96, 176.4, 192 kHz
    24Ai analog
    24 channels (balanced/unbalanced) 
    3x DB-25 D-sub and 6x 12-pin Phoenix 
    Max level: +24 dBu (digitally adjustable -96 to +22)
    24Ao analog outputs 24 channels (balanced, DC coupled) 
    3x DB-25 D-sub and 6x 12-pin Phoenix 
    Max level: +20 dBu (digitally adjustable -24 to 0 dB)
    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 
    Stereo TOSLink (optical S/PDIF) on Bank A (optional)
    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)
    Computer I/O channels USB 2.0 (44.1 to 48 kHz): 64 in/out 
    USB 2.0 (88.2 to 96 kHz): 32 in/out 
    USB 2.0 (176.4 to 192 kHz): 24 in/out 
    AVB Ethernet: 16 to 128 in/out, depending on 
          host computer speed
    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
    Power International 100-240V autoswitching supply 
    50-60 Hz • 0.5A max

    Mac System Requirements

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

    Windows System Requirements

    • 1 GHz Pentium-based PC compatible or faster
    • 2 GB RAM; 4 GB or more recommended
    • Windows 7, 8 or 10
    • Available USB 2.0 or 3.0 port
    • Available Ethernet port for firmware updates
    • A large hard drive (at least 500 GB for recording)

    Web App Support

    • Any web client platform: Mac, Windows, Linux, iOS, Android
    • Any web browser: Safari, Firefox, Chrome, Opera, Explorer, etc.
    • Web client must be connected to the same network as the MOTU AVB interface by wire or Wi-Fi.

    Included Software

    • MOTU AVB Discovery App for Mac & Windows (finds connected MOTU interfaces)
    • MOTU AVB Discovery App for iOS (available from Apple App Store)
    • MOTU AVB Control web app (served from the hardware itself)
    • AudioDesk 4.0 for Mac and Windows (separate download)

    Operating Systems

    • For computer audio I/O: Mac OS X 10.8 or later; Windows 7 or later
    • For web app control: Mac, Windows, Linux, iOS, Android

    Analog I/O Specifications

    Connector type
    Dynamic range
    Trim range 
    (in 1 dB steps)
    24Ao analog output DB-25 D-sub or 12-pin phoenix 123 dB -110 dB +20 dBu 24 dB (-24 to 0 dB)
    24Ai analog input DB-25 D-sub or 12-pin phoenix 110 dB -102 dB +24 dBu 118 dB (-96 to +22 dB)

    Compatible Mac Software

    The 24Ai and 24Ao ship with standard Core Audio drivers for Mac OS X for compatibility with virtually all Core Audio-compatible apps, including:

    • MOTU Digital Performer
    • Avid Pro Tools (version 9 or later)
    • Apple Logic Pro
    • Apple Logic Express
    • Apple Garage Band
    • Apple SoundTrack Pro
    • Ableton Live
    • Propellerhead Record & Reason
    • Steinberg Cubase
    • Cockos Reaper
    • Native Instruments Kontakt
    • Waves stand-alone apps (and plug-ins, via compatible host)

    Compatible Windows Software

    The 24Ai and 24Ao ship with standard ASIO and Wave drivers for Windows 7, 8 and 10 for compatibility with virtually all ASIO- and Wave-compatible audio apps, including:

  • Superb audio quality — Employs the same industry-recognized analog design as MOTU's groundbreaking 1248, 8M and 16A audio interfaces.

  • 72 simultaneous audio channels — 24 high-quality, balanced analog inputs (24Ai) or outputs (24Ao) on three banks of multi-channel connectors (D-sub and Phoenix), plus three banks of 8-channel ADAT optical for 24 analog channels and 48 digital channels.

  • Universal connectivity — Connects to a computer with audio class compliant high-speed USB 2.0 (compatible with USB 3.0 and iOS). Discovery app and web app software works alongside any host audio software.

  • On-board DSP with mixing and effects — Flexible 48-input digital mixer modeled after large format mixing consoles, with 12 stereo busses and DSP effects, including reverb, 4-band EQ, gate, and compression.

  • 32-bit floating point processing — DSP-driven mixing and effects engine delivers virtually unlimited headroom and the utmost in sound quality.

  • Modeled vintage effects processing — Classic reverb. Compression modeled after the legendary LA-2A compressor. EQ modeled after British analog console EQs.

  • System expansion — Add a 2nd MOTU AVB interface (24Ai, 24Ao, 1248, 8M or 16A) with a simple Cat-5e Ethernet cable. Connect up to five MOTU interfaces using a MOTU AVB Switch (sold separately).

  • AVB audio networking — Build a network with multiple interfaces and computers using standard AVB switches and network cabling, with ultra-low network latency, even over long cable runs (100 meters point to point). Stream hundreds of audio channels among devices and computers on the network.

  • Matrix routing and splitting — Send any input to any output, or multiple outputs. Includes routing to and from the computer, plus any devices on the AVB network.

  • Web app control — Control on-board DSP, mixing, device settings, and network audio routing from web app software running in your favorite browser on a laptop, tablet or smart phone connected by wire or Wi-Fi to your local area network.

  • Stand-alone mixing with wireless control — Connect an Apple Airport™ or other Wi-Fi router directly to the 24Ai or 24Ao with a standard Ethernet cable and control powerful mixing and DSP effects from your smart phone or tablet, without a computer. Great for live sound mixing.

  • ADAT digital I/O — Use the 24Ai or 24Ao as a 24-channel optical expander for other gear. 24 channels at 44.1/48 kHz or 12 channels at 88.2/96 kHz.

  • Comprehensive metering — The large backlit 324 x 24 LCD lets you view all signal activity at a glance with detailed metering for all analog and digital I/O. Access hardware settings from a simple and convenient menu.

  • AudioDesk 4.0 — Includes AudioDesk workstation software with 24-bit recording, sample-accurate editing and 32-bit mixing and mastering.

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