Universal Audio Apollo Solo USB Audio Interface (for Windows)

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zZounds Gear Experts Say...
Made for Windows PCs, this 2x4 desktop interface gives you 2 Unison preamps and a UAD-2 SOLO processor, unlocking the power of UA's vast library of plug-ins.

Shape your recordings into records with genuine UA conversion and classic mixing tools. Featuring class-leading Universal Audio conversion, two Unison mic preamps, and a suite of built-in effects, Apollo Solo USB puts album-quality recording on your desktop. This 2 x 4 USB audio interface for Windows also includes a generous collection of UAD plug-ins to record vocals and instruments through, at near-zero latency.


Get a closer look at the Apollo Solo in this one-minute overview from UA:


Learn how to get started with your Apollo Solo USB interface:


Unison Technology for Stunning Mic and Guitar Preamp Emulations

Apollo Solo USB's Unison technology gives you the tone, touch and "feel" of the world's most sought-after tube and transformer-based mic preamps and guitar amps. It includes the UA 610-B Tube Preamp, Marshall Plexi Classic Amplifier, and Ampeg SVT-VR Classic Bass Amp plug-ins -- and can be expanded with exclusive titles from Neve, Avalon, SSL, Fender, and more. The secret is a unique hardware-software integration, which adjusts the impedance of Apollo's instrument and mic preamps to match the emulated hardware -- for authentic analog sound unmatched by other recording interfaces.

Realtime UAD Plug-In Processing for Recording with Near-Zero Latency

Derived from Universal Audio's award-winning Apollo interfaces, Apollo Solo USB opens up a range of classic analog color via its Realtime UAD Processing. Featuring an onboard UAD-2 SOLO Core processor, Apollo Solo… read more USB lets you monitor and record through the full library of UAD Powered Plug-Ins -- at near-zero latency, regardless of your audio software buffer setting. It's like having a virtual analog studio that fits in a laptop bag.

The UAD library features more than 100 titles and offers everything from classic Moog filters to Ampex tape to Lexicon reverbs -- with more being added every few months. These are the exact same UAD plug-ins used on hit records by Billie Eilish, Kendrick Lamar, Dr. Dre, Foo Fighters, and many more.

Built for Musicians, Electronic Producers, and Songwriters

Apollo Solo USB's robust all-metal construction, best-in-class headphone amplifier, and superior audio conversion is perfect for musicians, songwriters, and electronic music producers who need UA quality in a compact package.

Features:

- Desktop 2 x 4 USB audio interface with class-leading 24-bit/192 kHz audio conversion
- Unison mic preamp and guitar amp emulations from Neve, API, Avalon, Manley, Marshall, Fender, and more
- Realtime UAD Processing allows near-zero latency tracking with classic UAD plug-in effects, regardless of software buffer setting
- Includes studio compressors, EQs, reverbs, and guitar amp emulations, and more as part of "Realtime Analog Classics" bundle
- Best-in-class headphone amplifier for loud, detailed, low-noise monitoring

Apollo Solo USB Includes the "Realtime Analog Classics" UAD Powered Plug-Ins Bundle:
- UA 610-B Tube Preamp and EQ
- Marshall Plexi Classic Guitar Amp
- 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

All other UAD Powered Plug-Ins sold separately at www.uaudio.com. All trademarks are property of their respective owners.
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System Requirements:

- Windows 10 64-Bit Edition
- PC with available built-in USB 3 SuperSpeed (Type-A or Type-C port)
- Intel Core i-Series or Xeon processor
- USB 3 Type-C cable (not included)
- Internet connection to download software and authorize UAD plug-ins
- 6 GB available storage

All specifications are typical performance unless otherwise noted, tested under the following conditions: 48 kHz internal sample rate, 24-bit sample depth, 20 kHz measurement bandwidth, with balanced inputs and outputs.

SYSTEM:

I/O Complement:
- Microphone Inputs: Two
- Analog Line Inputs: Two
- Hi-Z Instrument Inputs: One
- Analog Monitor Outputs: Two (one stereo pair)
- Headphone Outputs: One stereo
- USB 3 SuperSpeed Port: One USB-C Type-C connector

A/D – D/A Conversion:
- Supported Sample Rates (kHz): 44.1, 48, 88.2, 96, 176.4, 192
- Bit Depth Per Sample: 24
- Simultaneous A/D conversion: Two channels
- Simultaneous D/A conversion: Four channels
- Analog Round-Trip Latency: 1.1 milliseconds @ 96 kHz sample rate
- Analog Round-Trip Latency with up to five serial UAD Powered Plug-Ins via Console application: 1.1 milliseconds @ 96 kHz sample rate

ANALOG I/O:

Frequency Response: 20 Hz - 20 kHz, ±0.1 dB

Line Inputs 1 & 2:
- Connector Type: 1/4" Female TRS Balanced (Combo XLR/TRS)
- Dynamic Range: 118 dB (A–weighting)
- Total Harmonic Distortion + Noise: –107 dBFS
- Input Impedance: 10K Ohms (differential)
- Gain Range: +10 dB to +65 dB
- Maximum Input Level (600 Ohm source): +20.7 dBu

Microphone Inputs 1 & 2:
- Connector Type: XLR Female, pin 2 positive (Combo XLR/TRS)
- Phantom Power: +48V (switchable per mic input)
- Dynamic Range: 118 dB (A–weighting)
- Total Harmonic Distortion + Noise: -108 dBFS
- Default Input Impedance: 5.5K Ohms (variable via Unison plug-ins)
- Gain Range: +10 dB to +65 dB
- Pad Attenuation (switchable per input): 20 dB (variable via Unison plug-ins)
- Maximum Input Level: +25.2 dBu (minimum gain, pad engaged)

Hi-Z Instrument Input:
- Connector Type: Female 1/4" TS Unbalanced
- Dynamic Range: 118 dB (A–weighting)
- Total Harmonic Distortion + Noise: -105 dBFS
- Input Impedance (variable via Unison plug-ins): 1M Ohms
- Gain Range: +10 dB to +65 dB
- Maximum Input Level (@ minimum gain): +12.5 dBu

Outputs 1 & 2:
- Connector Type: 1/4" Female TRS Balanced
- Output Impedance: 100 Ohms (differential)
- Dynamic Range: 115 dB (A–weighting)
- Total Harmonic Distortion + Noise: -106 dBFS
- Stereo Level Balance: +/-0.05 dB
- Maximum Output Level: +20.7 dBu
- Operating Reference Level: +14 dBu, +20 dBu (selectable)

Stereo Headphones Output:
- Connector Type: 1/4" Female TRS Stereo
- Dynamic Range (A–weighting): 115 dB (600 Ohm load), 114 dB (32 Ohm load)
- Total Harmonic Distortion + Noise (A–weighting): -97 dB (600 Ohm load), -88 dB (32 Ohm load)
- Maximum Output Power: 62 mW (300 Ohm load), 240 mW (32 Ohm load)

ELECTRICAL:
- Power Supply: External AC to DC
- AC Connector Type: Changeable blades (UL, VDE, UK, SSA, CCC)
- AC Requirements: 100V – 240V AC, 50 – 60 Hz
- DC Connector Type: Male plug, 2.1 mm x 5.5 mm, center positive
- DC Requirements: 12 VDC, ±5%
- Maximum Power Consumption: 10 Watts

ENVIRONMENTAL:
- Operating Temperature Range: 32 to 95 degrees Fahrenheit (0 to 35 degrees Celsius)
- Storage Temperature Range: -40 to 176 degrees Fahrenheit (-40 to 80 degrees Celsius)
- Operating Humidity Range: 20% to 80%

MECHANICAL:

Dimensions:
- Width: 7.1" (179.9 mm)
- Height (front): 1.0" (25.2 mm)
- Height (rear): 1.8" (46.7 mm)
- Depth: 4.8" (121.1 mm)
- Shipping Box (Length x Width x Height): 8.5 x 6.4 x 2.63 inches (216 x 162 x 68 mm)

Weight:
- Weight (bare unit): 1.38 lbs (0.63 Kg)
- Shipping Weight (with box): 4 lbs (1.8 Kg)

Package Contents:
- Apollo Solo USB 3 Audio Interface
- External power supply with changeable region-specific AC connectors
- Getting Started URL Card

Dimensions and Weight in Packaging

Heritage Edition, Includes 5 extra UAD plug-in collections

  • Shipping Weight: 3.25 lbs
  • Shipping Dimensions: 9 x 7 x 5 in
  • Manufacturer Part Number (MPN): APLSU-HE

Open Box (Like New), Heritage Edition, Includes 5 extra UAD plug-in collections

  • Shipping Weight: 3.25 lbs
  • Shipping Dimensions: 9 x 7 x 5 in
  • Manufacturer Part Number (MPN): APLSU-HE

For support or warranty questions, please contact the manufacturer:
Phone: 831-440-1176
Web: https://help.uaudio.com/
Apollo Solo USB Manual
Apollo Solo USB Host Computers and Compatibility

Reviewers gave this product an overall rating of 3.5 out of 5 stars. (1 ratings)
Submitted November 14, 2025 by Bryan P in St. Charles, IL

"Very good interface, but......."

Overall: 3.5 out of 5 stars
(see rating details)
Verified Purchaser zZounds has verified that this reviewer purchased this specific product from us.
Well,first off the interface sounds great, on the mixing side in your daw there isn't much dsp to use so be prepared to get a satellite. But that won't help you while recording,the 1 sharc chip can load maybe 2 or 3 plug ins at a time depending on what your using. Some plug ins use so much dsp you can't even use one like the vocal chamber and couple others with high dsp. That really dosnt matter to me,as I dont record much live music other than a synth or sample,mainly I wanted the plug ins to use in cubase. If your going windows I'd recommend that you either have a computer with thunderbolt, buy a big rack interface and be done,or if you can upgrade your pc to thunderbolt that would be my suggestion. My computer(that I just bought) although being very powerful has mini pcie slots so I can't upgrade to a sharc card or a thunderbolt pcie card. If you absolutely must go usb 3.0,first make sure your computer has usb 3.0 as it will NOT work on usb 2.0 slot,then I'd buy the twin duo. Only has one more sharc chip for recording you'll have a little more dsp,and mixing too,but depending on what your doing and how many plug ins your using you still may need a satellite. Right now im running apollo solo on windows 11 and a apollo octo satellite. Plan to get a twin duo in the future and another octo. Better safe than sorry....

Sound
Sound quality is night/day difference when comparing sound to any other audio interface I've owned or used. You can get your… read more synthesizer or guitar or vox,or whatever you are recording to sound like you've never heard it before the pre amps are amazing.

Ease of Use
Pretty easy to set up and use if your computer inclined. Again once you get going and moving around the daw it's pretty much seamless.

Quality
Well made product,has some weight to it,and looks pretty sleek.

Value
I dont think it's priced correctly, as the duo twin has 2 sharc chips and only 200$ more.... idk

Manufacturer Support
Haven't yet had to deal with universal audio, buy my brother has an he tells me there a pretty great company.

The Wow Factor
There is lots of allure and appeal in apollo interfaces,just do your homework and see which is best for you. Buy once,cry once.

Musical Background:
Edm production/DJ/Rude boy jungalist

Musical Style:
Drum and bass/ Jungle EDM read less
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Heritage Edition, Includes 5 extra UAD plug-in collections

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5 Plug-in Collections Included with Heritage Edition:
  • UA 1176 Collection, Teletronix LA‑2A Classic Leveler Collection, Pultec Passive EQ Collection, UA 610 Tube Preamp & EQ Collection, UA Pure Plate Reverb