Portable USB headphone amps

Specs as supplied by the manufacturer.

Sonic Unity Encore MDSD $99 USD/119 EURO

 

  • 32-bit/384kHz PCM and native DSD 256 decoding
  • Discrete USB audio receiver and D/A converter
  • Asynchronous transfer mode 
  • High-performance headphone amplifier
  • Optical output (shared with 3.5mm headphone out) capable of S/PDIF and DoP stream
  • USB powered, no external power supply required
  • Diminutive size measuring just 2 - 3/8" x 1 - 3/16" x 3/8"
  • Works with Android (4.1 & above with OTG), iOS (with camera adapter USB cable), Windows 7/8/10, and Mac. 
Added 2016