Sonarworks SoundID Reference for Speakers & Headphones Upgrade Reference 4 Studio Edition (ESD); speaker and headphone calibration software; upgrades Sonarworks Reference 4 Studio Edition to SoundID Reference for Speakers & Headphones; Caution - upgrade version! Requires a registered license of Sonarworks Reference 4 Studio Edition; precise adjustment of the frequency response to get flat and neutral sounding monitor speakers or headphones; enables a more precise evaluation of recordings and mixes; room analysis and automated calculation of the room size based on several measurements; Audio Calibration Engine allows for accurate processing; save an unlimited number of calibration profiles for monitor speakers; comes with headphone calibration profiles for more than 280 supported models; target curve custom adjustments in real time; Translation Check simulates over 20 different devices and device types for accurate mix translation results; three filter modes to choose from: Zero Latency, Mixed and Linear Phase allow to optimize filter quality and latency according to the monitoring situation; additional processing controls for Mono, Dry/Wet and Safe Headroom; App only: MIDI mapping for various controls and User Presets for predefined output device/channel pair combinations