There are lots of headphone amps, but only the Vamp Verza works with the digital output of an iPhone or Android device, and that's a difference you can hear.
The Cambridge Audio DacMagic Plus offers a lot of features and decent sound quality but its price tag could be the limiting factor.
The Arcam rPac offers PC and Mac users an affordable upgrade to their onboard sound, complete with a dedicated headphone amplifier.
Company has a knack for making great sounding desktop gear; the new D1 is the perfect music "interface" between your computer and speakers or headphones.
It'll replace your computer's sound card and could make your hi-fi sound significantly more awesome. It's Beresford's affordable TC-7520 DAC, and we've just finished testing it
Crave UK's Nate Lanxon explains how to get the best sound out of your Apple AirPort Express wireless gadgetry.
Apple's AirPort Express can output audio via fibre-optic cable, making it ideal for use in a high-end audio system. Our thrilling guide will tell you how
iBasso's stunning D2 is both an external USB DAC (read: sound card), and a very capable headphone amplifier. We've been using one for a month and thought it was time we told you how good it was
The Audioengine D3 may be teensy, but this affordable component can radically upgrade your computer's sound quality!
Halide Design makes awesome-sounding USB digital-to-analog converters in California. They're downright tiny and supereasy to use.