For years, wireless earbuds have largely focused on creating a personal listening bubble, using passive noise isolation or active noise cancellation to block out the outside world. But that's not always the ideal listening experience. Whether it's a morning walk, a quick trip to the grocery store or working from a café, there are plenty of situations where staying aware of your surroundings can be just as important as the music you're listening to.That's the idea behind open-ear audio, a category that's steadily gaining traction.