MOTU 24Ao Audio Interface
MOTU·Model 24Ao·motu-24ao
Photos
Manufacturer product photography — the drawn faceplate above stays true to panel layout; these show the hardware itself.
About the MOTU 24Ao
The MOTU 24Ao is purpose-built for output-heavy applications like IEMIn-Ear Monitor — earpieces that replace floor wedges, feeding each player their own mix. The reason this whole rack exists. rigs, providing 24 channels of analog output on three DB25A 25-pin D-shaped connector carrying 8 channels of analog or AES audio in one multicore — the Tascam pinout is the de-facto standard. connectors. With USB and AVBAudio Video Bridging — open network audio (MOTU, PreSonus) where the switch reserves bandwidth so streams can’t glitch. Milan is its pro profile./TSN networking, it integrates into both traditional and networked audio workflows. The onboard DSPDigital Signal Processing — the number-crunching that does EQ, compression, and effects inside a box. More DSP means more processing at once. mixer with 48 inputs handles monitor mixing independently, and the ESS Sabre32 convertersThe circuitry that turns analog audio into digital data and back (A/D and D/A). Converter quality sets a digital rig’s sound ceiling. ensure pristine audio quality to every ear. An excellent choice when you need lots of dedicated outputs for individual IEM mixes.
The MOTU 24Ao is a dedicated output engine — it exists to push analog audio out of your rack in large quantities, and it does almost nothing else. Twenty-four channels of analog output on three DB25A 25-pin D-shaped connector carrying 8 channels of analog or AES audio in one multicore — the Tascam pinout is the de-facto standard. connectors, 1UThe standard slice of rack height: 1U = 1.75″. A 3U box takes three slices; half-rack gear pairs two units side by side in one., 25 watts at idle. There are no mic preampsThe gain stage that lifts a mic’s tiny signal up to line level — the first thing a signal hits, and a big part of how a console sounds. here, no analog inputs to speak of; this box is purpose-built for the moment when a playback system or a networked audio feed needs to become a wall of balancedCarries the signal on two wires and cancels whatever noise both pick up — why mic cables can run hundreds of feet hum-free. analog lines feeding IEMIn-Ear Monitor — earpieces that replace floor wedges, feeding each player their own mix. The reason this whole rack exists. transmitters, monitor amps, or a split snakeA multicore cable bundling many channels into one stage-to-console run. A sub-snake collects one corner of the stage into a drop box.. That singular focus is exactly what makes it worth considering.
In practice, those three DB25sA 25-pin D-shaped connector carrying 8 channels of analog or AES audio in one multicore — the Tascam pinout is the de-facto standard. mean you can feed up to eight stereo IEMIn-Ear Monitor — earpieces that replace floor wedges, feeding each player their own mix. The reason this whole rack exists. mixes off a single rack unitThe standard slice of rack height: 1U = 1.75″. A 3U box takes three slices; half-rack gear pairs two units side by side in one. without a single TRSTip-Ring-Sleeve — a 1/4″ jack with three contacts carrying a balanced signal or a stereo pair. A guitar plug with one extra ring. breakoutA cable that splits one multichannel connector (like a DB25) into individual plugs — the octopus that turns 8 channels into 8 XLRs. cable in sight — just three Mogami or Gepco snakesA multicore cable bundling many channels into one stage-to-console run. A sub-snake collects one corner of the stage into a drop box. running straight to your transmitter rack. The dual AVBAudio Video Bridging — open network audio (MOTU, PreSonus) where the switch reserves bandwidth so streams can’t glitch. Milan is its pro profile. ports let it live inside a MOTU AVB network as a pure analog output node, so your show file stays upstream on a Mac or a networked switch and the 24Ao converts whatever arrives to analog without complaint. Word clockThe shared heartbeat keeping every digital box sampling in lockstep. One device leads, the rest follow — or you get clicks and pops. I/O on BNCThe twist-lock coax connector used for word clock and antenna runs — it locks, so it can’t be pulled out mid-show. keeps it locked to the rest of a digital system if AVB isn't your routing layer. The ESS Sabre32 convertersThe circuitry that turns analog audio into digital data and back (A/D and D/A). Converter quality sets a digital rig’s sound ceiling. are well-regarded in this product line, and at a 1U footprint drawing under 35 watts peak, the efficiency-per-channel math is hard to argue with.
Pick the 24Ao if your rig is already committed to MOTU's AVBAudio Video Bridging — open network audio (MOTU, PreSonus) where the switch reserves bandwidth so streams can’t glitch. Milan is its pro profile. ecosystem, or if you're running a DAWDigital Audio Workstation — the recording and playback software (Logic, Ableton Live, Pro Tools) at the center of a computer rig.-based playback system that needs a clean, dense analog output stage in minimum rack space. It's also a strong choice when a tour or venue has a fixed analog infrastructure and you need to meet it with reliable balancedCarries the signal on two wires and cancels whatever noise both pick up — why mic cables can run hundreds of feet hum-free. outputs at scale. Skip it if you need any meaningful return path — recording inputs, analog line ins for a virtual soundcheckPlaying a recorded show back through the console as if the band were on stage — dial in mixes before anyone plugs in. feed — because this box won't give you that. Engineers building a more balanced I/O rig should look at MOTU's interfaces that trade some outputs for inputs rather than trying to force the 24Ao into a role it wasn't designed for.
In the rack
- Run all three DB25A 25-pin D-shaped connector carrying 8 channels of analog or AES audio in one multicore — the Tascam pinout is the de-facto standard. connectors with labeled, pinned-out snakesA multicore cable bundling many channels into one stage-to-console run. A sub-snake collects one corner of the stage into a drop box. before load-in and tape a channel map to the inside of the rack lid — tracing a DB25 signal path in a dark wing during a show is a bad time.
- If you're using AVBAudio Video Bridging — open network audio (MOTU, PreSonus) where the switch reserves bandwidth so streams can’t glitch. Milan is its pro profile., designate one of the two RJ45 ports as primary and leave the second connected to a secondary switch path; AVB's network redundancyA second copy of anything critical — supply, computer, network path — already running so one failure can’t stop the show. only helps if the second port is actually wired.
- Word clockThe shared heartbeat keeping every digital box sampling in lockstep. One device leads, the rest follow — or you get clicks and pops. out can feed downstream gear in the rack — if you have other digital devices that accept BNCThe twist-lock coax connector used for word clock and antenna runs — it locks, so it can’t be pulled out mid-show. sync, let the 24Ao be the clock master so you have one authoritative timing source and one place to troubleshoot if things drift.
- At 229 mm depth it's shallower than many interfaces in this channel count, but still measure your rack's usable depth with cable bend radius accounted for — three DB25A 25-pin D-shaped connector carrying 8 channels of analog or AES audio in one multicore — the Tascam pinout is the de-facto standard. connectors exiting the rear simultaneously take more room than a single XLRThe standard 3-pin locking connector for mics and balanced line signals — pin 1 is the shield, pins 2 and 3 carry the balanced pair. run.
24-ch analog output + USB/AVBAudio Video Bridging — open network audio (MOTU, PreSonus) where the switch reserves bandwidth so streams can’t glitch. Milan is its pro profile. networking. Output-focused for IEMIn-Ear Monitor — earpieces that replace floor wedges, feeding each player their own mix. The reason this whole rack exists. feeds.
I/O Ports (9)
| Port | Connector | Direction | Signal | Channels |
|---|---|---|---|---|
| Analog Out 1-8 (DB25) | DB25 | output | analog audio | — |
| Analog Out 9-16 (DB25) | DB25 | output | analog audio | — |
| Analog Out 17-24 (DB25) | DB25 | output | analog audio | — |
| AVB Network 1 (RJ45) | RJ45 | bidirectional | digital audio | — |
| AVB Network 2 (RJ45) | RJ45 | bidirectional | digital audio | — |
| USB-C | USB C | bidirectional | data | — |
| Word Clock In (BNC) | BNC | input | digital audio | — |
| Word Clock Out (BNC) | BNC | output | digital audio | — |
- Power (IEC) (IEC C14)
Deciding between two?
Rack space, watts, weight and every connector, side by side.
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