Universal Audio Apollo x4 Gen 2 Thunderbolt 3 Audio Interface w/Studio+ Plug-Ins
Apollo X | Gen 2: Built for the Stars, Ready for Your Studio
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Universal Audio Apollo x4 Gen 2 Thunderbolt 3 Audio Interface with Studio+ Plug-Ins

SKU: UAPX4G2STU MFR: APX4G2-STU
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Key Features

  • Experience elite audio quality with this Thunderbolt 3 audio interface for pristine recordings.
  • Harness low latency for real-time tracking and mixing, ensuring seamless audio production workflows.
  • Expand your studio with versatile input/output options, perfect for diverse recording setups.
  • Enjoy rock-solid driver stability for uninterrupted sessions; focus on your music, not troubleshooting.
  • Elevate your sound with included Studio+ Plug-Ins, adding professional polish to every track.
  • Create professional-sounding videos using this digital audio interface for superior sound capture.
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Special Offers

  • Purchase an Apollo X Gen 2 or Twin X DUO USB HE and eceive $1,096 worth of UAD plug-ins ... Offer ends 09/30/2025 See details.

Special Order?Estimated to Ship: 08/18/2025
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Universal Audio Apollo x4 Gen 2 Specifications

System

System

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  • Simultaneous Channel I/O Count

    12 x 18 (ADAT mode) (analog + digital)

  • Microphone Inputs

    Four

  • High Impedance (Hi-Z) Instrument Inputs

    Two

  • Analog Line Inputs

    Four

  • Analog Line Outputs (DC coupled)

    Four (six including Monitor outputs)

  • Analog Monitor Outputs (DC coupled)

    Two (one stereo pair)

  • Headphone Outputs

    Two stereo

  • Digital Audio Ports

    One input, one output (ADAT or S/PDIF, selectable)

  • Thunderbolt 3 Port

    One

  • Simultaneous A/D conversion

    Four channels

  • Simultaneous D/A conversion

    10 channels

  • Supported Sample Rates

    44.1, 48, 88.2, 96, 176.4, 192kHz

  • Bit Depth Per Sample

    24

  • Analog Round-Trip Latency

    1.1 milliseconds @ 96 kHz sample rate
    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)

Analog I/O

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  • Frequency Response

    20 Hz - 20 kHz, +/-0.05 dB

  • Dynamic Range

    123 dB (A-weighted)

  • THD + Noise (1 kHz @ 24 dBu, -1 dBFS)

    -117 dB (0.00014%)

  • Maximum Input Level (PAD on)

    25 dBu

  • Default Input Impedance

    5.4 K Ohm (variable via Unison plug-ins)

  • Gain Range

    +10 dB to +65 dB

  • Pad Attenuation

    20 dB (variable via Unison plug-ins) (switchable per mic input)

  • Phantom Power

    +48V (switchable per mic input)

  • Connector Type

    XLR female, pin 2 positive (combo XLR/TRS)

  • Hi-Z Inputs 1 & 2

    (600 K Ohm input termination)
    Frequency Response: 20 Hz - 20 kHz, +/-0.05 dB
    Dynamic Range: 122 dB (A-weighted)
    THD + Noise (1 kHz @ 11.4 dBu, -1 dBFS): -111 dB (0.00028%)
    Maximum Input Level (at minimum gain): 12.4 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 - 4

    Frequency Response: 20 Hz - 20 kHz, +/-0.05 dB
    Dynamic Range: 124 dB (A-weighted)
    THD + Noise (1 kHz @ 19.2 dBu, -1 dBFS): -115 dB (0.00018%)
    Maximum Input Level (reference level @ +4 dBu): 20.2 dBu
    Input Impedance: 10 K Ohm
    Gain Range: +10 dB to +65 dB
    Connector Type: 1/4" female TRS balanced

  • Line Outputs 1 - 4

    Frequency Response: 20 Hz - 20 kHz, +/-0.05 dB
    Dynamic Range: 128 dB (A-weighted)
    THD + Noise (1 kHz @ 19.2 dBu, -1 dBFS): -117 dB (0.00014%)
    Maximum Output Level: Reference level @ +4 dBu: 20.2 dBu
    Maximum Output Level: Reference level @ -10 dBV: 14.5 dBu
    Output Impedance: 100 Ohm
    Connector Type: 1/4" female TRS balanced

  • Monitor Outputs L & R

    Frequency Response: 20 Hz - 20 kHz, +/-0.04 dB
    Dynamic Range: 129 dB (A-weighted)
    THD + Noise (1 kHz @ 19.2 dBu, -1 dBFS): -120 dB (0.0001%)
    Maximum Output Level: 20.2 dBu
    Output Impedance: 100 Ohm
    Connector Type: 1/4" female TRS balanced

  • Stereo Headphone Outputs 1&2

    Frequency Response: 20 Hz - 20 kHz, +/-0.01 dB
    Dynamic Range: 124 dB (A-weighted)
    THD + Noise: 300 Ohm load (1 kHz @ 14.4 dBu, -1 dBFS): -108 dB (0.00040%)
    THD + Noise: 600 Ohm load (1 kHz @ 14.8 dBu, -1 dBFS): -112 dB (0.00025%)

  • Stereo Headphone Outputs 1&2 (Contd.)

    Maximum Output Level: 300 Ohm load (1 kHz @ 14.4 dBu, -1 dBFS): 15.4 dBu
    Maximum Output Level: 600 Ohm load (1 kHz @ 14.8 dBu, -1 dBFS): 15.8 dBu
    Maximum Output Power: 300 Ohm load: 68 mW RMS
    Maximum Output Power: 600 Ohm load: 38 mW RMS
    Connector Type 1/4" female TRS stereo

Digital I/O

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  • Digital Audio Port

    One input, one output (ADAT or S/PDIF, selectable)

  • Connector Type

    Optical TOSLINK JIS F05

  • S/PDIF Channels

    One stereo input, one stereo output

  • ADAT Channels

    Up to eight input & eight output channels

  • Format

    S/PDIF: IEC 958
    ADAT: Lightpipe with S/MUX

  • Supported Sample Rates

    S/PDIF: 44.1, 48, 88.2, 96kHz
    ADAT: 44.1, 48, 88.2, 96, 176.4, 192kHz

  • Channel Assignments @ 44.1 kHz, 48 kHz

    Channels 1 - 8

  • Channel Assignments @ 88.2 kHz, 96 kHz

    Channels 1 - 4

  • Channel Assignments @ 176.4 kHz, 192 kHz

    Channels 1 - 2

  • Internal, ADAT, S/PDIF

    Conditional per selected digital input type

Electrical

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  • Power Supply

    External AC-to-DC power supply, level VI compliant

  • AC Input Connector Type

    IEC C8, non-polarized

  • AC Requirements

    100V - 240V AC, = 50 - 60 Hz, 1.2 A MAX

  • DC Connector Type

    Male barrel plug, 2.1 mm x 5.5 mm, center positive

  • DC Requirements

    12 VDC, +/-5%

  • Maximum Power Consumption

    19 Watts (when portable host computer not charging)

  • Ambient Temperature Range

    32 to 104 Degree F (0 to 40 Degree C)

Physical

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  • Dimensions (W x H x D)

    Chassis Only: 9.17 x 2.51 x 5.87" (232.98 x 65.81 x 149.13mm)
    Including Knob & Jack Protrusions: 9.17 x 2.51 x 6.12" (232.98 x 65.81 x 155.60mm)

  • Weight

    3.2 lbs (1.47kg)

About Universal Audio Apollo x4 Gen 2

Bring your musical creations to life with the Apollo x4 Gen 2 Thunderbolt 3 Audio Interface, the world's most powerful desktop audio interface designed for professional-grade recording and production. This state-of-the-art interface empowers you to produce larger sessions with its elite-class Apollo X Gen 2 converters, offering the highest-resolution audio conversion and an unprecedented dynamic range that captures every sonic detail.

Equipped with four Unison mic preamps, the Apollo x4 allows you to harness the tone and feel of iconic analog gear from industry legends like Neve, API, Manley, and Fender. This innovative Unison technology provides impedance-matched analog modeling, digitally controlling mic preamp impedance and gain staging to recreate the authentic sound and feel of classic equipment.

Experience the power of real-time UAD processing with onboard QUAD Core DSP, enabling you to record through an extensive library of UAD plug-ins, including those from Neve, API, Manley, Auto-Tune, and hundreds more. The Apollo x4's enhanced Monitor D/A conversion delivers ultra-low noise and distortion, with a studio-grade D/A conversion featuring -120 dB THD+N and a dynamic range of 129 dB DNR.

The Apollo x4 is designed to streamline your workflow with new UAD Console features like Auto-Gain, Plug-In Scenes, Monitor Controller, and Immersive Audio. Mix with confidence in any environment using Apollo Monitor Correction by Sonarworks, ensuring accurate sound reproduction whether you're using monitors or headphones.

Out of the box, the Apollo x4 provides access to a suite of included UAD plug-ins, such as Auto-Tune, Fairchild, and Teletronix, with the Essentials+ Editions. The interface also includes a comprehensive collection of channel strips, compressors, limiters, equalizers, special processing tools, instruments, delay and modulation effects, reverbs, and guitar and bass amplifiers, offering a complete toolkit for any recording session.

The Apollo x4's professional headphone monitoring features two elite-class HP outputs, delivering clean and powerful amplification with 124 dB DNR and -108 dB (0.0004%) THD+N into 300 Ohm, ensuring pristine audio quality for critical listening.

Designed to expand on the acclaimed Apollo Twin, the Apollo x4 offers expanded I/O and a hybrid system that combines its DSP processing with your computer's native processing. This allows for large sessions with complex plug-in chains, surpassing any native-only recording setup. As your studio grows, link up to four Thunderbolt Apollo interfaces for up to 128 channels of premium I/O, all controlled from your desktop with the Apollo x4.

Elevate your studio with the Apollo x4 Gen 2 Thunderbolt 3 Audio Interface, a powerhouse tool that brings the legendary UA sound to your fingertips, inspiring your next musical collaboration.

Universal Audio Apollo x4 Gen 2 Features

  • 12 x 18 Thunderbolt 3 audio interface with QUAD Core DSP plug-in processing
  • Four Unison mic preamps, two Hi-Z instrument inputs, optical Toslink I/O (ADAT or S/PDIF)
  • Two 1/4" monitor outs, four 1/4" line outs (ALT 1 / 2), two 1/4" TRS headphone outs
  • Elite-class Apollo X Gen 2 converters with 24-bit / 192 kHz resolution
  • Enhanced D/A for critical monitoring and playback with 129 dB dynamic range
  • Calibrate your main monitor and headphone outputs with Apollo Monitor Correction powered by Sonarworks
  • Fully-featured monitor controller with alternate speaker switching and integrated talkback for easy communication with talent
  • Updated UAD Console app featuring Auto-Gain, Plug-In Scenes, subwoofer integration with Bass Management, immersive audio support, and more
  • Onboard DSP supports over 200 UAD plug-ins via VST, AU, and AAX 64 formats in all major DAWs
  • Includes up to 50+ UAD plug-ins with Studio+ Editions
  • Compatible with LUNA, Logic Pro, Pro Tools, Cubase, Ableton Live, and more
  • Expandable with Thunderbolt Apollo interfaces
  • Free industry-leading technical support from knowledgeable audio engineers

Warranty Information

This product has a limited warranty of 12 months for parts and 12 months for labor.

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Key Features

  • Experience elite audio quality with this Thunderbolt 3 audio interface for pristine recordings.
  • Harness low latency for real-time tracking and mixing, ensuring seamless audio production workflows.
  • Expand your studio with versatile input/output options, perfect for diverse recording setups.
  • Enjoy rock-solid driver stability for uninterrupted sessions; focus on your music, not troubleshooting.
  • Elevate your sound with included Studio+ Plug-Ins, adding professional polish to every track.
  • Create professional-sounding videos using this digital audio interface for superior sound capture.

What's in the box:

  • Universal Audio Apollo x4 Gen 2 Thunderbolt 3 Audio Interface
  • Studio+ Plug-Ins
  • External Power Supply
  • AC Power Cable (IEC C7/Non-Polarized)
  • Universal Audio 1 Year Limited Warranty