Portable USB headphone amps

Specs as supplied by the manufacturer.

Zorloo ZuperDAC $74

ESS Sabre ES9018K2M DAC, PCM up to 24 bit / 192 kHz

ESS Sabre ES9601 headphone amp

46mm (L) x 23mm (W) x 10mm (H), excluding USB connector

Weight: 20g

Works with Win (UAC2 driver available), OS X, iOS, Android

Added 2016