I haven’t heard every closed-back headphone on the market, but I’ve heard more than most people. The Focal Stellia is the most expensive one I’ve tried yet, so it’s a good thing it makes a serious case for becoming my favorite. At least, it might be the best full-size headphone I’ve heard that you could feasibly bring on your commute, aboard an airplane, or to the gym – assuming you don’t mind risking your $2,999 headphones. As you might know, the very best headphones traditionally feature an open back design that lets ambient noise in and leaks your music out. Most…

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