Not long ago, hi-res audio was marginal, but the format has the potential to go mainstream.

WSJ: Sonic Truth

Unlike high-definition video, which can result in disconcerting detail (hello, pores), hi-res audio smooths more than it sharpens.

WSJ: Sonic Truth

As a test, I downloaded files from HDtracks.com, an online retailer specializing in hi-res audio, plugged a device known as a digital-to-analog converter (DAC) into my computer and listened over earphones.

WSJ: Sonic Truth

When I heard audiophiles rave about "hi-res" audio files digital-music downloads that purportedly sound superior to what you hear on CD I was suspicious, and a little intrigued.

WSJ: Sonic Truth