Universal Audio · Prosumer · Thunderbolt · 2019 on
Universal Audio released the Apollo Twin X in October 2019, putting the converters from its new Apollo X rack interfaces into the Twin's familiar desktop box. It came as a Duo or Quad, now with Thunderbolt 3, and kept the MkII's two Unison preamps, front Hi-Z input, talkback mic and monitor controls. On paper the jump is clear, with UA's spec for mic-input dynamic range going from 118 dB on the MkII to 123 dB. In October 2024 UA launched Gen 2 in a grey case, with better digital-to-analog conversion and Auto-Gain in the Console app, and both generations can use the Sonarworks monitor correction UA added. For most people the black first-generation Duo is the one to hunt. It plugs straight into a modern Mac or Thunderbolt PC, no adapter needed.
In the photos
The Twin X has a USB-C-shaped Thunderbolt 3 port on the back, where the Twin MkII's Thunderbolt 2 port is the smaller Mini DisplayPort shape. The first Twin X (2019) is black, and the Gen 2 from October 2024 has a pale grey case. A Twin X USB has a USB port instead. Duo and Quad look the same, so ask for a UAD Meter & Control Panel screenshot showing two DSPs.
Mac and Windows
Current UAD software supports it on macOS 11 Big Sur through 26 Tahoe, Apple silicon included (with Reduced Security and kernel extensions allowed), and on 64-bit Windows 10 or 11 with a Thunderbolt 3, 4 or 5 port. UA says AMD PCs are untested and that a first-generation Twin X needs UAD v10.0 or later, warning that earlier software can damage it. A Gen 2 needs v11.5.0 or later.
Power, cables and licences
Check the listing photos against this list, and ask the seller about anything you can’t see. A missing power supply or a licence that won’t transfer should come off the price.
UA warns that UAD software older than v10.0 can damage a first-generation Twin X, so install current software before anything else. The locking power plug must be twisted home or the unit can lose power, and UA notes its supplies can whine when the Apollo is off, which is normal.
Buying your first one? How to pick a first used interface covers inputs, mic gain and drivers, and the power supply guide covers which ones need their adapter.
Buying guide
We'd buy the black first-generation Twin X titled with its power supply at $814 delivered from a 100% seller, right at the $818 median. There are at least 83 for sale and most ask $750–1,025 delivered, with used US units from $638, Japan imports at $939–1,192 delivered, and new ones on the search page asking a median near $1,199. Gen 1 is black and the 2024 Gen 2 is pale grey, and the rear photo should show a USB-C-shaped Thunderbolt 3 port, so skip the two listings whose photos show an earlier Twin under a Twin X title. It needs UA's 12 V, 4.2 A locking supply (a 1.5 A Twin MkII supply won't do) and a real Thunderbolt 3 or 4 cable, so pick one with them or budget for both. Heritage, Essentials+ or Studio+ plug-ins on a used unit move only through UA's transfer form, and UA's warranty covers the original owner only.
$637.79est. delivered
The lowest delivered Twin X Duo here at $638 from a 98.8% seller, about $180 under the median. The title names no generation, supply or cable, so check the photos for the case colour and ask about the 4.2 A supply.
Universal Audio Apollo Twin X UAD 2 DUO Core Thunderbolt Audio Interface
$813.58est. delivered
Titled with the power supply, the part a Twin X can't run without, at $814 delivered from a 100% seller. The photo shows a black first-generation unit powered up with its meters lit.
Universal Audio Apollo Twin X Duo Thunderbolt Audio Interface w Power Supply
Delivered prices include shipping as eBay quoted it to a US address on Oct 14, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Snapshot
Checked . Some may have sold.
Delivered prices include shipping as eBay quoted it to a US address on Oct 14, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Used$637.79est. delivered
$619.99 + $17.80 shipping
Buy It Now$619.99
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Good buy
Lowest fixed price here. No generation, supply or cable named.
Seller: webuy376
98.8% positive
Used$813.58est. delivered
$799.00 + $14.58 shipping
Buy It Now$799.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Good buy
Titled with the power supply. Black Gen 1, powered on in the photo.
Seller: catbotstudio
100% positive
Used$749.85est. delivered
$729.85 + $20.00 shipping
Buy It Now$729.85
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Titled Gen 2, the cheapest here. The photos should show a pale grey case; no supply named.
Seller: hpjexpress
99.9% positive
Used$764.40est. delivered
$750.00 + $14.40 shipping
Buy It Now$750.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Heritage Edition titled with a case and cable. No supply named.
Seller: draguuu
100% positive
Used$907.69est. delivered
$859.00 + $48.69 shipping
Buy It Now$859.00
Our take
Titled Gen 2 with box, and the photo shows the pale grey case. No supply named.
Seller: catbotstudio
100% positive
Used$337.95est. delivered
$325.00 + $12.95 shipping
Auction · no bids yet · ends in 9d 7h
Check the seller
Titled Twin X, but the front in the photo reads apollo twin with no x, like a Twin MkII. Ask for the rear photo.
Seller: deepcreekpawn3
99.6% positive
Used$649.99delivered
$649.99 · free shipping
Buy It Now$649.99
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Check the seller
Titled Twin X and tested, but the photo shows a silver Twin with no x and no talkback dimple, like the 2013 original.
Seller: japanmomostore
99.7% positive
Used$1,192.50est. delivered
$989.00 + $203.50 shipping
Buy It Now$989.00
Priced high
Titled works tested, from Japan with $204 shipping. Asks more than a new Gen 2 Studio+ Edition at $1,144.
Seller: fareastsonus
99.6% positive
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