Universal Audio Apollo Solo USB Desktop 2×4 USB Type-C Audio Interface

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The Universal Audio Apollo Solo USB is a compact desktop 2×4 interface designed for use in project/home studios and mobile recording setups.

Key Features

  • USB 3.0 Type-C Interface for Windows
  • Unison Mic Preamps
  • Up to 192 kHz / 24-Bit Resolution
  • Two Combination XLR-1/4″ Mic/Line Inputs


Out of stock

The Universal Audio Apollo Solo USB is a compact desktop 2×4 interface designed for use in project/home studios and mobile recording setups. Connecting to your Windows computer over USB 3.0 Type-C, the unit provides two combination XLR-1/4” connections for mic/line sources, as well as a 1/4″ input specifically tailored for electric guitars and basses. Two Unison preamps are on hand, each of which lets you color the incoming sound through Universal Audio’s preeminent modeling plug-ins. So, if you want the sound of a Neve or an API on your guitar or vocal, you can purchase one of the company’s appropriate plug-ins and use them as you record, committing their sound to the resulting audio capture.

The Apollo Solo USB sports two 1/4″ output connections for your monitors, as well as a dedicated headphone output. Whether you monitor through your speakers or through headphones, you’ll experience near-zero latency performance, meaning you can play through UAD emulations without the processing interfering with your performance or timing.

The interface features an onboard UAD-2 SOLO Core processor, giving you some dedicated DSP for operating the plug-ins. This unit is designed to be portable, with its all-metal construction and convenient desktop form factor. Included with the Apollo Solo USB is the Realtime Analog Classics bundle from UAD, whose specific plug-ins can be perused in the features section.

Please note, the Apollo Solo USB requires an external power supply and a USB 3.0 port on your Windows computer in order to operate. Refer to the manufacturer’s website to verify your computer’s compatibility.

Key Features at a Glance

  • Desktop 2×4 USB 3.0 Type-C audio interface with 24-bit / 192 kHz audio conversion
  • Two XLR-1/4″ combo mic/line inputs
  • One 1/4″ Hi-Z instrument input
  • Two 1/4″ monitor outputs
  • Front-panel 1/4″ headphone output
  • Unison mic preamp and guitar amp emulations from Neve, API, Manley, Marshall, Fender, and more
  • Realtime UAD-2 SOLO Processing for near-zero latency tracking with classic UAD plug-in effects, regardless of software buffer settings
  • Includes studio compressors, EQs, reverbs, guitar amp emulations, and more as part of Realtime Analog Classics bundle
  • Convenient desktop form factor
  • Connects to a USB 3.0 port on your compatible Windows computer
  • Powered via 12 VDC external power supply

Included Plug-Ins

  • UA 610-B Tube Preamp and EQ
  • Marshall Plexi Classic Amplifier
  • Ampeg SVT-VR Classic Bass Amp
  • Raw Distortion Guitar Pedal
  • Teletronix LA-2A Compressor (Legacy)
  • UA 1176LN Compressor (Legacy)
  • UA 1176SE Compressor (Legacy)
  • Pultec EQP-1A EQ (Legacy)
  • Pultec Pro EQ (Legacy)
  • Precision Delay Modulation
  • Precision Delay Modulation L
  • Precision Reflection Engine
  • Precision Channel Strip
  • Realverb Pro

Channels of I/O

2 Inputs / 4 Outputs at 192 kHz

Max Sample Rate/Resolution

192 kHz / 24-Bit

Number of Mic Preamps


Input Level Adjustment

1 x Knob


Mic: -20 dB (Switchable per Channel)

High-Pass Filter

75 Hz

Display and Indicators

2 x Multi-Segment LED Meters (Clip, Input Level)
2 x Multi-Segment LED Meters (Clip, Output Level)
1 x Multi-Segment LED Meter (Multifunction)
1 x LED (High-Pass Filter)
1 x LED (+48 V)
1 x LED (Pad)

Expansion Slots



Host Connection

1 x USB Type-C (USB 3.0 / 3.1 Gen 1)

Analog I/O

2 x Combo XLR-1/4" TRS Balanced Mic/Line Input
1 x 1/4" TS Unbalanced Hi-Z Input (Front Panel)
2 x 1/4" TRS Balanced Monitor Output
1 x 1/4" TRS Unbalanced Headphone Output (Front Panel)

Phantom Power

+48 V, Selectable On/Off (Selectable on Individual Inputs)

Digital I/O





Frequency Response

20 Hz to 20 kHz ±0.1 dB

Gain/Trim Range

Mic/Line/Hi-Z Inputs:
+10 dB to +65 dB

Max Input Level

Mic Inputs:
+25.2 dBu (Min Gain, with Pad)
Line Inputs:
+20.7 dBu
Hi-Z Inputs:
+12.5 dBu (Min Gain)

Max Output Level

Monitor Outputs:
+20.7 dBu

Headphone Output Power

62 mW into 300 Ohms
240 mW into 32 Ohms

Dynamic Range

Mic/Line/Hi-Z Inputs:
118 dBA
Monitor Outputs:
115 dBA
Headphone Outputs:
115 dBA


Mic Inputs:
5.5 Kilohms
Line Inputs:
10 Kilohms
Hi-Z Inputs:
1 Megohm
Monitor Outputs:
100 Ohms


Mic Inputs:
-108 dBFS
Line Inputs:
-107 dBFS
Hi-Z Inputs:
-105 dBFS
Monitor Outputs:
-106 dBFS
Headphone Outputs:
-97 dB

Digital Audio

Sample Rates

Up to 192 kHz

Bit Depths



1.1 ms at 96 kHz (Input to Output)

Sync Sources



OS Compatibility

Windows 10 (64-Bit)

Compatible Software (Not Included)

Any Core Audio Compliant Software

Included Software


Processor Requirement

Intel Core
Intel Xeon

Storage Requirements

6 GB

Required Hardware

Available USB 3.0 Port
USB Cable (Not Included)

Internet Connection

Required for Registration, Software/Driver Download, Plug-In Authorization


Power Requirements

Power Requirements

AC Input Power

100 to 240 VAC, 50/60 Hz

AC/DC Power Adapter

12 VDC, Center-Positive (Included)

Power Consumption

10 W


Anti-Theft Features


Operating Humidity

20 to 80%

Operating Temperature

32 to 95°F / 0 to 35°C

Storage Temperature

-40 to 176°F / -40 to 80°C


7.1 x 4.8 x 1.8" / 18.03 x 12.19 x 4.57 cm


1.4 lb / 0.6 kg

Packaging Info

Package Weight

3.24 lb

Box Dimensions (LxWxH)

8.5 x 6.5 x 4.6"

  • Universal Audio Apollo Solo USB Desktop 2x4 USB Type-C Audio Interface with Real-Time UAD Processing for Windows
  • External Power Supply with Changeable Region-Specific AC Connectors