Lets face it, we’re playing more games, listening to more music and watching more movies on the go. Portability is a desirable feature in almost anything we buy these days. Yet, it is evident that the quality of experience offered to us on fixed setups is leaps ahead to what is being offered for mobile usage. Keeping that in mind, ASUS has introduced the Xonar U7 External USB sound card and headphone amplifier, with the key purpose being to offer high-quality sound processing on the go. In other words, an external, portable DAC (digital to analog convertor), with a headphone amp.