In order to get the most out of your HD music, it would be wise to invest in a digital-to-analog converter that bypasses the standard-quality sound card of your computer or smartphone for better sound clarity.
Sony's NW-ZX2 Walkman ($1,200) and Neil Young’s PonoPlayer ($400) are prime examples of portable players that are tailored for high-resolution audio. If you have an iPhone or iPad, and a library of CDs sitting in your garage, you’re in luck. You can rip your CDs to iTunes and choose the Apple Lossless (ALAC) setting (under General Preferences > Import Settings) to get your digital rip very close to CD-quality. Choosing the AIFF format means you’ll get CD-quality, but it’ll eat up a lot more of your hard drive space than ALAC. If you download FLAC files from other services (we’ve included a list of some sites below) you’ll have to convert those files into Apple Lossless if you want to play them on an iOS device.