iFi iDSD Valkyrie DAC review: a headphone amp capable of staggeringly complete, informative sound

iFi iDSD Valkyrie: Two-minute review iFi is a company that seldom goes anything other than ‘all-in’ – and with the new iDSD Valkyrie headphone amp/DAC it’s decided to try and make the best ‘portable’ headphone amp/DAC…