AKG K545 Review   Preamble   I was on the search for closed, portable circumaural headphones that would be driven easily by weak sources like smartphones - I commute often by train, and as much as I love my Koss Porta Pros, the lack of isolation forced me to look for something else. I've owned Etymotic in the past, but IEM-type phones just don't work for me. After some research, I decided to give the K545 a try - I have a pair of K240 Sextetts that are my favourite headphones in many regards, so AKG brand loyalty may have played a role in my...