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Universal Audio Apollo x8 18x24 Thunderbolt Interface | UAD Analog Classics Pro

Universal Audio Apollo x8 18x24 Thunderbolt Interface | UAD Analog Classics Pro

SoundPro Item: 146477 | Part Number: APX8G2-STU

$3,299.00
$4,124.00 $3,299.00
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MSRP: $4,124.00 | MAP: $3,299.00

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  • Unison Preamp Technology Replicates Hardware Impedance For Authentic Analog Capture
  • HEXA Core DSP Enables UAD Plug-In Processing Without Loading The Host CPU
  • Auto-Gain Sets Levels Across Multiple Inputs In Seconds For Faster Session Setup
  • Apollo Monitor Correction Powered By Sonarworks Ensures Reliable Mix Translation
  • Bass Management Integrates A Subwoofer Into Your Monitor Setup For Full-Range Reference
  • Dual-Crystal Clocking Maintains Ultra-Low Jitter Across All Supported Sample Rates
  • Expandable Via Thunderbolt Or Dante For Multi-Interface Studio Configurations
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The Apollo x8 Gen 2 is built for pro and project studio producers who demand the highest-resolution audio conversion available in a rackmount Thunderbolt interface. With four Unison mic preamps that physically model the impedance and gain-stage behavior of classic hardware from Neve, API, Manley, and Avalon, engineers can capture authentic analog character at the source — in real time, with no perceptible latency. Eight additional line inputs and dual Hi-Z instrument inputs give tracking sessions the I/O depth to handle complex multi-source setups without external splitters or patch bays.

HEXA Core DSP onboard enables a hybrid processing workflow where UAD plug-ins run entirely on dedicated hardware — freeing the host CPU for native plug-ins and large session management. This architecture is what separates Apollo from native-only interfaces: producers can run parallel chains of vintage compressors, tape emulations, and channel strips during tracking and mixing without taxing the DAW. The UAD Console app ties it all together with Auto-Gain, Plug-In Scenes, Bass Management for subwoofer integration, and immersive audio monitoring support up to 7.1 surround.

Apollo Monitor Correction powered by Sonarworks addresses one of the most persistent challenges in studio work — making decisions that translate across playback systems. The enhanced D/A monitoring path on the Gen 2 design delivers the dynamic range and distortion figures required for critical mix referencing, and the fully featured monitor controller with alternate speaker switching and integrated talkback rounds out a workflow that scales from solo tracking sessions to full-band recording environments. Apollo x8 also expands via Thunderbolt or Dante, supporting up to four linked interfaces and 128 channels of I/O as studio needs grow.

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Specifications

I/O Complement
Simultaneous Channel I/O Count (analog + digital)
18 x 24
Microphone Inputs
Four
High Impedance (Hi-Z) Instrument Inputs
Two
Analog Line Inputs
Eight
Analog Line Outputs (DC coupled)
Eight (ten including Monitor outputs)
Analog Monitor Outputs (DC coupled)
Two (one stereo pair)
Headphone Outputs
Two stereo
Digital Audio Ports
ADAT: Two inputs, two outputs; S/PDIF: One input, one output
Thunderbolt 3 Ports
Two (Mac only: Thunderbolt 1 and 2 supported via Apple Thunderbolt 3 to Thunderbolt 2 adapter)
Word Clock
One input, one output
A/D - D/A Conversion
Simultaneous A/D conversion
Eight channels
Simultaneous D/A conversion
14 channels
Supported Sample Rates (kHz)
44.1, 48, 88.2, 96, 176.4, 192
Bit Depth Per Sample
24
Analog Round-Trip Latency
1.1 milliseconds @ 96 kHz sample rate
Analog Round-Trip Latency through four UAD legacy plug-ins (included) via UAD Console software
1.1 milliseconds @ 96 kHz sample rate (no additional latency via Realtime UAD Processing)
Microphone Inputs 1 - 4
Frequency Response
20 Hz - 20 kHz, ±0.07 dB
Dynamic Range
123 dB (A-weighted)
THD + Noise (1 kHz @ 25 dBu, -1 dBFS)
-115 dB (0.00018%)
Maximum Input Level (PAD on)
26 dBu
Default Input Impedance (variable via Unison plug-ins)
5.4 K Ohm
Gain Range
+10 dB to +65 dB
Pad Attenuation (switchable per mic input)
20 dB (variable via Unison plug-ins)
Phantom Power (switchable per mic input)
+48V
Connector Type
XLR Female, pin 2 positive
Hi-Z Inputs 1 & 2 (600 K Ohm input termination)
Frequency Response
20 Hz - 20 kHz, ±0.08 dB
Dynamic Range
122 dB (A-weighted)
THD + Noise (1 kHz @ 9.6 dBu, -1 dBFS)
-111 dB (0.00028%)
Maximum Input Level (at minimum gain)
12.6 dBu
Default Input Impedance (variable via Unison plug-ins)
1 M Ohm
Gain Range
+10 dB to +65 dB
Connector Type
1/4" female TS unbalanced
Line Inputs 1 - 8
Frequency Response
20 Hz - 20 kHz, ±0.07 dB
Dynamic Range
124 dB (A-weighted)
THD + Noise (1 kHz @ 23 dBu, -1 dBFS)
-116 dB (0.00016%)
Maximum Input Level
24 dBu
Input Impedance
10 K Ohm
Gain Range (inputs 1 - 4 only)
+10 dB to +65 dB
Connector Type
1/4" female TRS balanced
Line Outputs 1 - 8
Frequency Response
20 Hz - 20 kHz, ±0.05 dB
Dynamic Range
127 dB (A-weighted)
THD + Noise (1 kHz @ 23 dBu, -1 dBFS)
-119 dB (0.00011%)
Maximum Output Level (Reference level @ +4 dBu)
24 dBu
Maximum Output Level (Reference level @ -10 dBV)
12.2 dBu
Output Impedance
100 Ohm
Connector Type
1/4" female TRS balanced
Monitor Outputs L & R
Frequency Response
20 Hz - 20 kHz, ±0.02 dB
Dynamic Range
130 dB (A-weighted)
THD + Noise (1 kHz @ 23 dBu, -1 dBFS)
-127 dB (0.000045%)
Maximum Output Level (Reference level @ +4 dBu)
24 dBu
Maximum Output Level (Reference level @ -10 dBV)
12.2 dBu
Output Impedance
100 Ohm
Connector Type
1/4" female TRS balanced
Stereo Headphone Outputs 1 & 2
Frequency Response
20 Hz - 20 kHz, ±0.02 dB
Dynamic Range
126 dB (A-weighted)
THD + Noise (300 Ohm load, 1 kHz @ 16.8 dBu, -1 dBFS)
-117 dB (0.00014%)
THD + Noise (600 Ohm load, 1 kHz @ 17.3 dBu, -1 dBFS)
-118 dB (0.00013%)
Maximum Output Level (300 Ohm load, 1 kHz, 0 dBFS)
17.8 dBu
Maximum Output Level (600 Ohm load, 1 kHz, 0 dBFS)
18.3 dBu
Maximum Output Power RMS (300 Ohm load, 1 kHz @ 17.8 dBu, 0 dBFS)
120 mW
Maximum Output Power RMS (600 Ohm load, 1 kHz @ 18.3 dBu, 0 dBFS)
67 mW
Connector Type
1/4" female TRS stereo
S/PDIF
S/PDIF Channels
One stereo input, one stereo output
Connector Type
Female Phono (RCA)
Format
IEC 958
Supported Sample Rates (kHz)
44.1, 48, 88.2, 96, 176.4, 192
ADAT
ADAT Channels
Up to eight input & eight output channels
Connector Type
Optical TOSLINK JIS F05
Format
ADAT Lightpipe with S/MUX
Supported Sample Rates (kHz)
44.1, 48, 88.2, 96, 176.4, 192
Channel Assignments @ 44.1 kHz, 48 kHz
Port 1 = Channels 1 - 8, Port 2 = 1 - 8 (mirrored)
Channel Assignments @ 88.2 kHz, 96 kHz
Port 1 = Channels 1 - 4, Port 2 = Channels 5 - 8
Channel Assignments @ 176.4 kHz, 192 kHz
Port 1 = Channels 1 - 2, Port 2 = Channels 3 - 4
Word Clock
Connector Type
BNC
Lock Range
±4% of any supported sample rate
Word Clock Input Termination
75 Ohm, switchable
Synchronization Sources
Internal, Word Clock, ADAT, S/PDIF
Electrical
Power Supply
External AC-to-DC power supply, level VI compliant
AC Input Connector Type
IEC male
AC Requirements
100V - 240V AC, 47 - 63 Hz, 1.6 A max
DC Connector Type
XLR 4-pin locking male (Neutrik P/N NC4MDM3-H)
DC Requirements
12 VDC, 9 A
Maximum Power Consumption
72 Watts (30 W typical)
Environmental
Ambient Temperature Range
32 to 104 F (0 to 40 C)
Dimensions
Width
19" (482.6 mm)
Height (1U rack space)
1.74" (44.2 mm)
Depth, Chassis Only
12" (305 mm)
Depth, Including Knob & Jack Protrusions
13.5" (343.1 mm)
Shipping Box (Width x Depth x Height)
23.62" x 16.73" x 7.68" (600 mm x 425 mm x 195 mm)
Weight
Shipping Weight (with box & accessories)
16.98 lbs (7.66 kg)
Weight (bare unit)
8.8 lbs (3.95 kg)
Included Items
Apollo x8 Gen 2 Audio Interface
Included
External Power Supply
Included
AC Power Cable (IEC)
Region specific (USA, EU, UK, ANZ, or Japan)
Set of (4) Rack-Mount Screws
Included
Getting Started URL Card
Included
Included UAD Plug-In Bundle
UAD Analog Classics Pro (80+ plug-ins)
Identifiers
SKU
146477

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