Reference-grade sound with EBM waveguide. The PreSonus Eris E7 XT Studio Monitors builds on the success of the original Eris series incorporating a cutting-edge waveguide for improved acoustic performance. The Eris E7 XT features a Kevlar woofer and silk dome tweeter providing powerful low-end response and articulate highs. The Eris E7 monitor features a range of acoustic tuning controls that allow you to adjust settings to the room you are in giving you the ability to work well in a range of untreated mixing environments. The premium-grade design provides you with clear consistent audio allowing you to produce professional mixes every time.