*Disclaimer - This is my first review on Head-Fi so please go easy on me.   The Sennheiser IE80 is the first set of high-end audio gear above 300$. I bought them second hand from an online store. My impressions will be different than most as I was able to pick these up for around 110$. I have owned these IEMs for around 7 months. I used them for listening to FLACs on my computer and Spotify Premium on my Nexus 6, occasionally with a digizoid zo2.   Build:   The IEMs feel pretty solid. The IE80s are built entirely out of plastic and feel like...