SonarWorks Upgrade Speakers & Headphones to MultichannelSoundID Reference for Multichannel delivers accurate and reliable reference sound for speaker setups from simple stereo up to 9. 1. 6 atmos systems. This upgrade allows you to keep all existing profiles & features provided in the stereo software version for speakers & headphones. The version for multichannel allows you to calibrate your multichannel studio speakers to set the frequency response target to be completely flat, and to time and phase align