Introduction:   The Sennheiser IE80. I would like to start with stating that I am not an audiophile. However, for the past years I have had my fair share of headphones/earphones and I have been involved with the audio world for some time now. Also, this is my first real review so please take it easy if I'm not as descriptive or accurate as other members on Head-Fi. My primary source when listening to the IE80 is the combination of my MacBook Pro (320kbps to 2600kbps audio files) and my Fiio E10K Olympus 2 DAC/AMP. I will be covering topics such as...