Exploring and intertwining these fringes has become a recent hallmark of Justin Vernon, Bon Iver’s lead singer. But pulling this act off in a massive, open-air venue such as the Bowl provides obvious challenges: Would cacophonous tracks like “10 d E A T h b R E a s T” just sound messy? Would the quiet songs like “Holocene” lose their nostalgic intimacy? Amazingly, the answer was no in both cases. Chalk it up, perhaps, to a new sound system Bon Iver was using called L-ISA Hyperreal Sound, which is described as a way to achieve a wider sonic panorama. And that it did.