Case in point: MP3 players. Music downloaded and saved ... At this point, there are really only two major players in the high-end portable music space: Astell & Kern and Sony (where the Walkman ...

Here’s how it works. The best MP3 players transform your music to superior high-resolution sound, thanks to built-in digital-to-analog converters (DACs) and the fact that, well, they're not your ...