TechPowerUp published a review on the FiiO R7 Desktop Network Streamer/DAC/Headphone Amplifier
A quote from the article:
FiiO re-invents the DAC/amp wheel with the new R7 desktop network streamer all-in-one unit. It uses a novel portrait form factor with an integrated touch screen display and Android OS paired with extensive I/O and support for both headphones and speakers to be the most versatile audio source I have ever tried!FiiO R7 Desktop Network Streamer/DAC/Headphone Amplifier Review