The UM Pro 50, features five proprietary, balanced-armature drivers with a 3-way passive crossover, and is the flagship In Westone’s line of Universal-Fit In-Ear Musicians’ Monitors. By combining one low-frequency driver with two mid-range and two high-frequency drivers the UM Pro 50 creates a sound that is totally immersive, with sonic detail and clarity that has to be heard to be believed. Thunderous low’s, combine with rich, detailed midrange, and shimmering articulate highs, in a balanced and harmonious presentation that meets the demands of the biggest names in the music industry, and of the most discerning music lover. The Westone UM Pro 50 incorporates all the innovations and expertise that Westone has developed in almost 60 years of designing and manufacturing products for the human ear. The compact, low-profile, ergonomic design is comfortable, and can be worn for hours and hours. . Westone’s proprietary silicone and comfort foam ear-tips are provided in 5 different sizes and enhance the performance of our In-Ear Musicians’ Monitors by ensuring a superb fit and by provide superior noise isolation. Ambient sound levels are reduced an average of 25 dB, which makes UM Pro 50 ideal for use onstage or in other noisy environments.