I tested it, and Astell & Kern’s new pocketable smartphone DAC is a clear winner for detail, marred just slightly by bantamweight bass
Astell & Kern AK HC5: two-minute review Astell & Kern builds some outstanding digital audio players, and the company also knows how to charge us for them. But it’s taken pity on those of us without the wherewithal, and has developed this HC5 headphone amp/DAC. It is a portable device intended to transform your bog-standard smartphone into a viable source of hi-res audio for anyone with the wired headphones good enough to take advantage of it. With high-end AKM digital-to-analog conversion components on board, Astell & Kern’s ‘digital audio remaster’ and ‘high driving mode’ technologies included, and both balanced and unbalanced headphone outputs, the HC5 is specified to get the job done. It also features half- a-dozen digital filters, as well as a huge range of volume adjustment and some slightly imprecise-feeling physical controls that serve to undermine the robust and tactile overal...