It was one of Kickstarter’s most successful campaigns. Its inventors sought $800,000 in funding from the public — but raised a gigantic $6.2 million. The project: the PonoPlayer, “a revolution in music listening.” It was designed to play back music files that use up to 20 times more data than the MP3 files that gave the first pocket music players a bad name. “Everyone who’s ever heard PonoMusic will tell you that the difference is surprising and dramatic,” Pono wrote on Kickstarter. “They tell us that not only do they hear the difference; they feel it in their body, in...