iFi ZEN Air DAC & Headphone Amplifier ( Burr Brown DSD1793 / PCM, DSD256, & MQA / USB )

A nice price on the original version of this DAC. Has an integrated headphone amplifer so can provide upto 230mW of output via its 6.35mm output.
Review
IFi ZEN Air DAC Review(Prime Audio Reviews)
Key Features
The iFi ZEN Air DAC is a compact desktop DAC and headphone amp for clearer daily listening across computers, mobiles, and consoles. It replaces the lower-grade audio stage built into everyday devices with a dedicated Burr-Brown DAC design, helping your music, games and streamed audio sound more detailed and composed. For a first external DAC, it keeps the process simple while still offering support for serious audio formats.
USB connectivity makes setup straightforward, while the front headphone output and rear RCA connections let it fit easily into headphone and speaker-based systems. Support for PCM up to 32-bit/384kHz, fully native DSD256, MQA, and D gives you broad playback compatibility. PowerMatch adds extra gain for less sensitive headphones, XBass adjusts low-end response, and analog volume control helps maintain audio quality when listening at lower levels.
Burr-Brown DAC chip delivers clear, natural sound reproduction
Supports Hi-Res PCM, DSD256, and MQA playback
PowerMatch offers extra gain for harder-to-drive headphones
XBass delivers fuller low-end to suit your setup
DAC and headphone amp design provides simple flexibility
The product page is here.