We developed the Ultimate Ears 18 Pro Custom In-Ear Monitors specifically for the most discerning performers and music listeners. If you demand nothing but the best, our flagship in-ear monitors deliver the comfort, quality, and sound that you expect. They combine our new experience-driven, six-speaker Ultimate Ears sound signature with new technologies including a new cable built for durability and reduced distortion, three acoustically tuned sound channels, and multiple passive crossover points creating the ultimate in separation, detail, and clarity. 

Sound Quality. The Ultimate Ears 18 Pro offers the best acoustic experience from 6 proprietary balanced armatures. The sophisticated 4 passive crossover points direct sound with precision; 2 balanced armatures handle low-end frequencies, 1 balanced armature handles the low-mids, 1 balanced armature handles the high-mids, and 2 balanced armatures are dedicated for the high octaves. Our patented triple bore sound channels keep the lows, mids and highs separate until they interact with your eardrum.
 - The Ultimate Ears 18 Pro Custom In-Ear Monitors are compatible with all wireless transmission systems and portable media devices.
 - The Ultimate Ears 18 Pro Custom In-Ear Monitors provide -26 dB of isolation and passive noise cancellation.