As a brief primer on the v-JAYS family, it suffices to say that Swedish designers JAYS came up with the original version as a lightweight, foldable headphone with an unusually slender headband and flexible, foam-padded square earpieces—an attractive enough design, saddled with less than stellar sound quality. As we said at the time, those extra dollars bought iPod and iPhone users roughly the same sonics as they’d get for free with Apple’s…