I own the AKG K240 DF Studio monitor headphones, and I have been using them for more than 10 years.  Assuming that, after so long period of time, the headphones sound quality should have improved, I decided to make a research on the market in order to find a substitute of my old headphones.  I took into account technical specifications, reviews and prices, as well as the availability of some brands in the city where I live.  Discarding other brands, I considered choosing between Sennheiser and AKG. Sennheiser was generally more available...