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Audio Interface

Universal Audio Apollo x16 Gen 2

The Apollo x16 is a high-channel-count Thunderbolt interface with exceptional conversion quality, making it ideal as the primary I/O for a Mac-based playback rig. Its 16 analog outputs via DB25 can feed IEM transmitters, FOH sends, and monitoring simultaneously, while UAD onboard DSP provides real-time plugin processing without taxing your playback computer. The Heritage Edition includes a generous bundle of UAD plugins out of the box.

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Photos

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

Photo: Universal AudioClick to zoom
Documented outputs
44 destination connections
Documented inputs
5Based on documented inputs
Rack space
1UBuilder checks available rail space
Power draw
30W72W documented maximum
Catalog estimate
~$3,799Use 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 Apollo x16 Gen 2 is Universal Audio's high-channel-count Thunderbolt interface, and in a Mac-based playback or IEM rig it functions as the central nervous system — the point where your DAW's stems become real analog signal that feeds transmitters, console sends, and monitor wedges simultaneously. Sixteen balanced analog outputs across two DB25 connectors, sixteen analog inputs on two more, plus AES/EBU and word clock I/O: this is a single rack unit doing the job that used to require a small patchbay and two separate converters. The onboard UAD DSP lets you run plugins — limiting, EQ, light compression on outputs — without touching your playback computer's CPU budget.

Documented outputs
44 destination connections
Documented inputs
5Based on documented inputs
Rack space
1UBuilder checks available rail space
apollox16
Universal Audio product panel1U · 30W
Function

How it works in the path

In practice, those DB25 outputs mean you're wiring Elco or Edac snakes, so budget time at load-in for that discipline. The word clock BNC with 75Ω termination makes it a clean clock master or slave in any digital ecosystem, which matters when you're locking to a Dante network or a digital console. Power comes from an external 12V DC brick via a locking 4-pin XLR — not a standard IEC, so know where that supply is and carry a spare or at minimum know the voltage spec. At up to 72W max draw it's not a heavy hitter on your conditioner, but the external brick adds a cable and a failure point worth tracking. The Thunderbolt 3 daisy-chain port means you can loop to a second TB3 device without burning a laptop port.

Best fit

Where it earns its place in the rack

Pick the x16 Gen 2 if you're running a professional Mac-based playback rig — Ableton, QLab, or a stem player — where you need more than eight discrete outputs and want conversion quality that won't embarrass you at a critical listening gig. It earns its $3,799 price tag in a touring context where the interface is mission-critical and the UAD DSP offload is genuinely useful. Skip it if your rig is Windows-based — Thunderbolt compatibility on Windows has historically been inconsistent enough to matter — or if you need mic preamps on the interface itself, since this box has none. If eight outputs cover your show, a smaller Apollo or a dedicated converter from another manufacturer will get you there for significantly less money.

In the rack

Details worth deciding before load-in.

  • Label both DB25 output snakes at the interface end AND the breakout end before the show — in a dark wing with transmitters racked above, tracing an unlabeled Elco under pressure is a real problem.
  • Secure the 4-pin XLR power connector with a loop of gaff around the cable and the rack rail; it locks, but road vibration over a tour will work it loose on units that get loaded in and out frequently.
  • Set the x16 as your word clock master and feed everything else — if you're clocking to a console or Dante, confirm the Apollo is set to external sync before doors, not during line check.
  • Use the second Thunderbolt 3 port to daisy-chain a backup drive or a secondary interface rather than running a second TB cable back to the laptop, keeping your port count free for redundancy options.

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

5 documented inputs

db25 + aes3 xlr

Arrives as
5 documented inputs
Connector
db25 + aes3 xlr
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 305 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: db25, aes3 xlr, bnc, 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.

Front panel
apollox16
Rear panel
Universal AudioApollo x16 Gen 2
All documented ports for Universal Audio Apollo x16 Gen 2
PortPanelConnectorDirectionSignalChannels
Analog In 1-8 (DB25)reardb25 inputanalog audio8
Analog In 9-16 (DB25)reardb25 inputanalog audio8
Analog Out 1-8 (DB25)reardb25 outputanalog audio8
Analog Out 9-16 (DB25)reardb25 outputanalog audio8
AES/EBU Outrearaes3 xlr outputdigital audio2
AES/EBU Inrearaes3 xlr inputdigital audio2
Word Clock Outrearbnc outputdigital audio—
Word Clock In (75Ω term)rearbnc inputdigital audio—
Thunderbolt 3 (1)rearthunderbolt bidirectionaldata—
Thunderbolt 3 (2)rearthunderbolt bidirectionaldata—
Power (12V DC, 4-pin XLR)rearxlr4 dc inputpower—

Showing 11 of 11 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
Universal Audio Apollo x16 Gen 2
Universal Audio Apollo x16D (Dante)
Universal Audio Volt 476
Universal Audio Volt 876
Fit📐 1U📐 1U📐 1U · half-rack📐 1U
Power⚡ 30W⚡ 30W⚡ 5W⚡ 15W
Weight⚖️ 11.9 lb⚖️ 9.0 lb⚖️ 1.5 lb⚖️ 5.5 lb
I/O🔌 11🔌 7🔌 9🔌 7
Estimate💵 ~$3,799💵 ~$2,999💵 ~$399💵 ~$999
Deep diveCurrent selectionFull 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 Universal Audio Apollo x16 Gen 2 affect rack fit and case depth?

It occupies 1U. Its documented depth is 305 mm.

How much power does the Universal Audio Apollo x16 Gen 2 draw?

Typical draw is 30W and documented maximum draw is 72W.

What connections does the Universal Audio Apollo x16 Gen 2 have?

11 documented physical ports, including Analog In 1-8 (DB25), Analog In 9-16 (DB25), Analog Out 1-8 (DB25), Analog Out 9-16 (DB25), AES/EBU Out, AES/EBU In.

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
Apollo x16 Gen 2 positioned in a rack planA simplified plan shows the unit taking 1 rack units, with its documented connection path continuing to a planned destination.Universal AudioApollo x16 Gen 2CONNECTED GEARnext signal destination1U · 305 mm deep

08 · Related gear, in the order you may need it.

Planning guides for audio interface systems.