
Auto-Gain sets it in about 10 seconds.
Select a channel, press AUTO and play or sing at your loudest level. Clip Protection applies a hardware limiter before the analog-to-digital converters.
Pickup currently not available
The Universal Audio Volt 4 Gen 2 is a 12-in/6-out USB audio interface with two Tone Shaping preamps, an ADAT or S/PDIF optical input and MIDI In and Out. It converts audio at up to 32-bit / 192 kHz over USB-C.
Two combo XLR/TRS mic/line inputs and two front-panel Hi-Z instrument inputs handle vocals and instruments. Tone Shaping offers three modes, Warmth, Focus and Shine, at up to 60 dB of gain, and each channel has independent +48V phantom power. The optical input accepts up to eight channels of ADAT at 44.1/48 kHz for expansion, and additional line I/O, MIDI In and Out and an onboard USB hub connect outboard gear, keyboards, drum machines and controllers.
A full-colour Smart Display shows inputs, levels and settings, with Auto-Gain and Clip Protection for setting safe levels. The Volt 4 Gen 2 is USB bus-powered and class-compliant on Mac, iPad and iPhone, uses the UA ASIO driver on Windows, and includes built-in loopback. It works with UAD Console and LUNA, and the UAD Volt Studio Bundle is included.

Select a channel, press AUTO and play or sing at your loudest level. Clip Protection applies a hardware limiter before the analog-to-digital converters.

Each mode applies an EQ curve and harmonic saturation derived from analog hardware, and saturation increases as you add gain.

The optical input carries eight ADAT channels at 44.1/48 kHz, four at 88.2/96 kHz and two at 176.4/192 kHz, or two channels of S/PDIF.

Three modes. Warmth: tube-style glow with soft transients. Focus: punchy transients with clarity. Shine: a full sound with a silky top end. Each includes an EQ curve and harmonic saturation.

A full-colour display shows inputs, levels and settings. Auto-Gain sets levels; Clip Protection limits peaks before conversion.

ADAT or S/PDIF optical input for up to eight channels of digital expansion, MIDI In and Out, and an onboard USB hub for peripherals and external MIDI controllers.

Built-in loopback for podcasting, streaming and content creation, and integration with UAD Console and LUNA.
| Microphone/Line Preamp Inputs | Two combo XLR/TRS |
|---|---|
| Instrument Inputs | Two ¼" TS |
| Line Inputs | Two ¼" TRS |
| Line Outputs | Two |
| Monitor Outputs | Two |
| Headphone Outputs | One stereo |
| USB (Type-C connectors) | One USB 2.0 host port (bus-power capable) · One USB 5VDC power port · One USB hub port |
| MIDI | In, out (two 3.5 mm Type A) |
| Supported Sample Rates (kHz) | 44.1, 48, 88.2, 96, 176.4, 192 |
|---|---|
| Bit Depth Per Sample | 32 |
| Simultaneous A/D Conversion | Four channels |
| Simultaneous D/A Conversion | 6 channels (4 main, 1 stereo headphone) |
| Available Gain | 60 dB |
|---|---|
| Tone Shaping (all analog inputs) | Selectable per channel: Warmth, Focus, Shine |
| Frequency Response | 20 Hz to 20 kHz, ±0.08 dB |
|---|---|
| Dynamic Range (A–weighted) | 119 dB |
| Total Harmonic Distortion + Noise (1 kHz @ -1 dBFS): -110 dB (0.0003 %) | |
| Maximum Input Level | 14 dBu |
| Input Impedance | 2 Kilohms |
| Phantom Power | +48V (switchable per channel) |
| Connector Type | XLR Female, pin 2 positive |
| Frequency Response | 20 Hz to 20 kHz, ±0.02 dB |
|---|---|
| Dynamic Range (A–weighted) | 116 dB |
| Total Harmonic Distortion + Noise (1 kHz @ -1 dBFS): -108 dB (0.0004 %) | |
| Maximum Input Level | 13 dBu |
| Input Impedance | 1 Megohms |
| Connector Type | ¼" TS unbalanced |
| Frequency Response | 20 Hz to 20 kHz, ±0.05 dB |
|---|---|
| Dynamic Range (A–weighted) | 119 dB |
| Total Harmonic Distortion + Noise (1 kHz @ -1 dBFS): -108 dB (0.0004 %) | |
| Maximum Input Level | 22 dBu |
| Input Impedance | 10 Kilohms |
| Connector Type | ¼" TRS balanced or TS unbalanced |
| Frequency Response | 20 Hz to 20 kHz, ±0.05 dB |
|---|---|
| Dynamic Range (A–weighted) | 126 dB |
| Total Harmonic Distortion + Noise (1 kHz @ -1 dBFS): -112 dB (0.0003 %) | |
| Maximum Output Level | 20.2 dBu |
| Output Impedance | 200 Ohms |
| Connector Type | ¼" TRS balanced |
| Frequency Response | 20 Hz to 20 kHz, ±0.08 dB |
|---|---|
| Dynamic Range (300 Ohms, A–weighted) | 116 dB |
| THD + Noise (1 kHz @ -1 dBFS, 300 Ohms) | -103 dB (0.0007 %) |
| Maximum Output Power into 32 Ohms | 45 mW per channel |
| Maximum Output Power into 300 Ohms | 24 mW per channel |
| Connector Type | ¼" TRS Stereo |
| Connector Type | Optical TOSLINK JIS F05 (shared with ADAT) |
|---|---|
| Format | IEC 958 |
| Supported Sample Rates (kHz) | 44.1, 48, 88.2, 96, 176.4, 192 |
| Connector Type | Optical TOSLINK JIS F05 (shared with S/PDIF) |
|---|---|
| Format | ADAT Digital Lightpipe with S/MUX |
| Supported Sample Rates (kHz) | 44.1, 48, 88.2, 96, 176.4, 192 |
| 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 | |
| Synchronization Sources | Internal, ADAT, S/PDIF |
| DC Input Connector Type | USB-C |
|---|---|
| DC Requirements | 5VDC (bus-power capable via Host port) |
| Power Consumption (@5VDC) | 4.2 W typical, 5.8 W maximum |
| Ambient Temperature Range | 32° to 104° F (0° to 40° C) |
|---|
| Chassis (including knobs) | Width x Depth x Height 7.4 x 4.9 x 2 in (18,7 x 12,5 x 5,1 cm) |
|---|---|
| Shipping Box | Width x Depth x Height 9.1 x 7.3 x 3.1 in (23,0 x 18,5 x 8,0 cm) |
| Shipping Weight (with box & accessories): 2.1 lbs (1.0 kg) | |
| Weight (bare unit) | 1.4 lbs (0.6 kg) |
|---|---|
| Volt 4 Gen 2 USB audio interface | |
| One-meter USB cable (Type-C to Type-C) | |
| Important safety instructions | |
| End-user license agreement |
| LUNA (DAW) | |
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| UA 1176 Classic FET Compressor | |
| Pure Plate Reverb | |
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| Oxide Tape Recorder | |
| Vibe Analog Machines and Vibe Analog Machines Essentials | |
| PolyMAX Synth | |
| Anthem Analog Synth | |
| UAD Lion '68 Super Lead Amp | |
| UAD Showtime '64 Tube Amp |
| Melodyne Essential by Celemony | |
| Ampeg SVT-VR Classic Bass Bundle by Plugin Alliance (Ampeg SVT-VR Classic, bx_Tuner, bx_Masterdesk_Classic) | |
| Virtual Drummer DEEP by UJAM | |
| Virtual Bassist DANDY by UJAM | |
| Splice INSTRUMENT | |
| Prisma - Producer Lab by UVI | |
| FL Studio Producer Edition (3 months free) | |
| Access to exclusive Puremix audio education content |
| macOS and Windows | Available USB 2.0 (or higher) port; USB cable (included); Intel, AMD or Apple silicon processor; Windows 10 64-bit or newer; macOS 12 Monterey or newer; internet connection for software downloads |
|---|---|
| iPad and iPhone | iPadOS / iOS 16 or newer. Devices with a Lightning port need an Apple Lightning to USB Camera Adapter. |
| DAW compatibility | All major DAWs, including Ableton Live, FL Studio, GarageBand, Logic Pro, Pro Tools and more |
| Windows driver | Windows uses the ASIO driver, available in the UA Connect app. Mac and iOS/iPadOS need no driver (class-compliant). |
| Requirements for bus-power vary by model and device. All specifications are subject to change without notice (per the maker). |
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