The PreSonus Quantum ES Ultimate Bundle is your one stop shop for professional studio-quality recording. Featuring the high-performance Quantum ES 2 USB-C Audio Interface with all-new MAX-HD mic preamps, a Studio One Pro software license and 12 months of access to tools, extras, add-ons, and more with Studio One Pro , a pair of powerful Eris 3.5 Studio Monitors packed with low-end punch, a pair of HD9 dynamic high-definition headphones, and an exceptionally clear M9 cardioid condenser microphone