Universal Audio · Pro · Thunderbolt · 2018 on
The x6 arrived in September 2018 as the smallest of the new Apollo X rack interfaces, which UA called the biggest leap in Apollo's history. All of them brought new converters, Thunderbolt 3 and Hexa DSP, six chips where the older racks topped out at four. UA pitched the x6 at electronic producers and post studios, so it's light on preamps and heavy on line I/O. You get two Unison mic preamps, six line inputs and outputs, two front Hi-Z inputs, two headphone outputs, dual ADAT, S/PDIF and word clock. UA listed 5.1 surround monitoring for it too. In October 2024 UA launched a grey Gen 2 with better conversion, still with six DSP chips. If you record synths and drum machines more than microphones, the black Gen 1 x6 is a lot of Apollo in one rack space.
In the photos
It's a 1U rack unit with two Hi-Z inputs and two headphone jacks on the front. The rear photo settles x6 against x8, because the x6 has two XLR mic inputs and six line inputs where the x8 has four and eight. Gen 1 (2018) has a black front panel and Gen 2 (2024) a pale grey one.
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. Gen 1 needs UAD v9.6.1 or later and 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's manual says to switch the x6 off before connecting or disconnecting its supply, and to use only the factory supply on its locking XLR plug. On Windows, UA's Thunderbolt guide has you disable Thunderbolt power management and review BIOS settings, so do that before blaming the unit for dropouts.
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 x6 at $1,575 with free shipping from a 99.8% pawn shop, since its photo shows the box and the power supply. There are at least 22 for sale and most ask $1,950–2,525 delivered, but that band is mostly new Gen 2 dealer stock at $2,060–2,799, while used Gen 1 units ask about $1,472–1,976 and a used Gen 2 asks $1,890. Gen 1 has a black front panel and Gen 2 a pale grey one, and the rear photo should show two XLR mic inputs and six line inputs, which tells an x6 from an x8. It runs only on UA's factory supply with a 4-pin locking XLR plug, so pick one that shows it or budget for the factory one, and bring a real Thunderbolt 3 or 4 cable. New dealer bundles include their Essentials+, Studio+ or Analog Classics plug-ins, but on a used unit those move only through UA's transfer form, and UA's warranty covers the original owner only.
$1,472.49delivered
The lowest x6 here at $1,472 with free shipping from a 99.6% seller, titled as a US Heritage Edition (HE). The photo shows a black Gen 1 with its box, power supply and a cable, but the Heritage plug-ins only come if the seller transfers them.
Universal Audio (UAD-2 Apollo X6 HE US) Apollo X6 Thunderbolt Audio Interface
$1,574.99delivered
A black Gen 1 at $1,575 with free shipping from a 99.8% pawn shop, about $850 under the median, and the photo shows the box and the power supply. Ask for a rear photo and a short video turning both mic preamps end to end.
Universal Audio Apollo X6 UAD2X6 Thunderbolt Audio Interface
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$1,472.49delivered
$1,472.49 · free shipping
Buy It Now$1,472.49
Good buy
Titled Heritage Edition. Black Gen 1 with box, supply and cable in the photo.
Seller: julibott_6
99.6% positive
Used$1,574.99delivered
$1,574.99 · free shipping
Buy It Now$1,574.99
Good buy
Black Gen 1 with box and power supply in the photo.
Seller: pawnamerica
99.8% positive
Used$1,889.96est. delivered
$1,839.95 + $50.01 shipping
Buy It Now$1,839.95
Our take
Used Gen 2 titled excellent, about $170 under the cheapest new Gen 2 listed. No supply named.
Seller: tronixhero
100% positive
New$2,399.00delivered
$2,399.00 · free shipping
Buy It Now$2,399.00
Our take
New Gen 2 with UAD Analog Classics from Sweetwater.
Seller: sweetwatersound
99.8% positive
Used$2,463.12delivered
$2,463.12 · free shipping
Buy It Now$2,463.12
Our take
Musician's Friend Gen 2 on a pre-owned card, titled Studio LN.
Seller: musiciansfriend
99.8% positive
New$2,499.00delivered
$2,499.00 · free shipping
Buy It Now$2,499.00
Our take
New Gen 2 Essentials+ Edition from Vintage King.
Seller: vintagekingaudio
99.9% positive
New$2,799.00delivered
$2,799.00 · free shipping
Buy It Now$2,799.00
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.
Our take
New Gen 2 Essentials from a dealer, the top ask here.
Seller: tourack
100% positive
Open box$1,957.27est. delivered
$1,950.00 + $7.27 shipping
Buy It Now$1,950.00
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.
Check the seller
Zero-feedback seller, and two other sellers use the same title. Pay only through eBay checkout.
Seller: m.s_1989
No feedback yet
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