xDSD EISA Best Portable DAC / Headphone Amplifier. Sounds great! SecretsAugust 15, 2018 iFi’s new portable DAC and headphone amplifier, the xDSD, has won what’s sure to be the first of many awards. EISA, the European Sound and Imaging Association, has awarded the xDSD Best Portable DAC/Headphone Amplifier for 2018-2019. Press