Modern and minimalistic, the excellent low-profile design of the IE 400 PRO contributes to the exceptional comfort which has allowed me to enjoy the IEMs for hours and hours. The flagship of the Pro series did not disappoint in sound quality, addressing the succinct mid-range of the IE 400 PRO, however, at a price premium of 71.6%. https://www.porta-fi.com/sennheiser-ie-400-pro-and-ie-500-pro-review
Being in the industry for over 25 years, I have used a few range of IEMs. The IE500 Pro, are by far the best set of in-ears I have ever come across with. They fit very comfortably in the ear and show to be of high quality built. The driver response provides a very neutral, balanced sound resolution at low and high levels. I have used them for long periods and throughout it was always very comfortable listening experience. Listening to the IE500 Pro, feels like you are in a studio on a treated acoustic environment listening to a nice pair of loudspeakers as oppose to a standard pair of in-ears. Highly recommended. BEST USES: Live Audio, Studio and Home! BOTTOM LINE: I would recommend this to a friend.