Outside of the audiophile world, most consumers are not aware of dedicated headphone amplifiers, which take the experience of personal listening to a whole new sonic level. In recent years, many of the leading audio-product manufacturers have pulled out all the stops and released cost-is-no-object examples that deliver higher levels of musical fidelity for headphones than ever before. As more and more listeners begin gravitating toward high-resolution music files as their preferred media, these ded…