SoundID Reference for Headphones and Apollo Monitor Correction Add-on bundle (download only)

IMPORTANT! A permanent SoundID Reference license is required to use an Add-on. 

Enhance your monitoring with SoundID Reference integrated directly into Universal 

Audioʼs Apollo X Gen 1 and Gen 2 interfaces. This bundle combines SoundID Reference 

for Headphones and the Apollo Monitor Correction Add-on into a single license key.  

SoundID Reference for Headphones is a calibration software that delivers consistently 

accurate studio reference sound on your existing headphones. The software includes 

presets of more than 500 headphone calibration profiles. With an applied headphone 

calibration profile the software sets the frequency response target to be completely flat 

across all audible frequencies. The headphone frequency response target is designed 

to emulate neutral-sounding speakers. With calibrated headphones, youʼll hear a flat, 

consistent sound wherever you go. 

Apollo Monitor Correction allows you to run the headphone calibration directly on 

Apollo X hardware. 

Key features of SoundID Reference 

→ Ready-to-use headphone calibration for 500 models 

→ 3 filter modes: Zero Latency, Mixed, and Linear Phase 

→ Additional DSP processing controls: Mono, Dry/Wet and Safe Headroom   

→ MIDI mapping in the SoundID Reference app for various controls 

→ User Presets in the SoundID Reference app for switching quickly between 

predefined output device/channel pair combinations 

Key features of Apollo Monitor Correction Add-on 

→ Calibration running directly on Apollo X hardware 

→ Multiple outputs calibrated simultaneously: up to two headphone profiles 

(depending on the Apollo X model used) 

→ Supported target modes include: Flat, Dolby Atmos Music curve, user Custom 

Target, and various device emulation targets via Translation Check 

→ Near-zero latency integrated performance 

What's included 

→ Activation key for the SoundID Reference product license: the product can be 

activated and used on  3 devices 

→ Activation key for the Apollo Monitor Correction Add-on product license: the 

product can be activated and used on 3 devices 

→ SoundID Reference standalone app for Headphones ASIO, WASAPI, APO, HAL 

→ SoundID Reference DAW plugin for Headphones AU, VST2, VST3, AAX 

→ Averaged profiles for 500 supported headphone models 

→ Apollo Monitor Correction Add-on for integrated functionality with Apollo X 

devices 

System requirements 

→ A supported Apollo X audio interface:  

○ Apollo X Gen 1: Apollo Twin X Duo/Quad, Apollo Twin X USB, Apollo x4, 

Apollo x6, Apollo x8, Apollo x8p, Apollo x16 

○ Apollo X Gen 2: Apollo Twin X Duo/Quad, Apollo x4, Apollo x6, Apollo x8, 

Apollo x8p, Apollo x16, Apollo x16D 

→ A supported operating system 

○ macOS 11 Big Sur, 12 Monterey, 13 Ventura, 14 Sonoma, 15 Sequoia 

○ Windows 10, 11 

→ UAD Console app v1.2.1 (or newer) installed, and UAD2 Software v11.5.1 (or 

newer) installed 

→ Sonarworks-supported or Sonarworks-individually calibrated headphones 

→ Internet connection for periodic license validation (full offline use not 

supported) 

Sound Id Integrations