Universal Audio Apollo Solo Desktop 2×4 Thunderbolt 3 Audio Interface

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

Key Features

  • Thunderbolt 3 Interface for Mac/Windows
  • Unison Mic Preamps
  • Up to 192 kHz / 24-Bit Resolution
  • Two Combination XLR-1/4″ Mic/Line Inputs


Universal Audio Apollo Solo Desktop 2×4 Thunderbolt 3 Audio Interface


The Universal Audio Apollo Solo is a compact desktop 2×4 interface designed for use in project/home studios and mobile recording setups. Connecting to your Mac/Windows computer over Thunderbolt 3, 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 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, which is bus-powered over Thunderbolt, 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 is the Realtime Analog Classics bundle from UAD, whose specific plug-ins can be perused in the features section. The Apollo Solo also integrates seamlessly with LUNA, Universal Audio’s free Mac-based, single-window recording system with unlimited track counts and full Audio Units support.

Please note, the Apollo Solo requires a powered Thunderbolt 3 port on your 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 Thunderbolt 3 audio interface with 24-bit / 192 kHz audio conversion
  • Two XLR-1/4″ combo mic/line inputs
  • 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
  • Bus-powered over Thunderbolt
  • Connects to a Thunderbolt 3 port on your compatible Mac or Windows computer

Integration with LUNA Recording System for Mac

Apollo Solo works with all major DAWs including Logic Pro, Ableton Live, Pro Tools, and more. Additionally, it becomes a fully integrated recording system with LUNA, a powerful free recording application for Mac from Universal Audio. Bolstered by Accelerated Realtime Monitoring, LUNA lets you track and mix in an intuitive single-window workflow with unlimited track counts, full Audio Unit support, and access to a suite of exclusive LUNA Instruments and Extensions such as Studer multitrack tape and Neve Summing.

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 Thunderbolt (MDP) (Thunderbolt 3)

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




Memory Card Slot



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

macOS 10.14 / 10.15
Windows 10 (64-Bit)

Compatible Software (Not Included)

Any Core Audio Compliant Software

Included Software


Storage Requirements

6 GB

Required Hardware

Available Thunderbolt 3 Port
Thunderbolt 3 Cable

Internet Connection

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


Power Requirements

Thunderbolt Bus Power

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

2.75 lb

Box Dimensions (LxWxH)

17.5 x 11.9 x 8.8"

  • Universal Audio Apollo Solo Desktop 2x4 Thunderbolt 3 Audio Interface with Real-Time UAD Processing