I have had the Matrix Audio TS-1 for a couple weeks now. It uses the AKM chips so the sound is very good and includes a liner power supply port for easy upgrade.
I have it in one of my headphone setups. The single ended out sounds pretty much as good as the balanced outs.
https://power-holdings-inc.com/Matrix-TS-1-Music-Streamer-headphone-amp-p764399023
Similar in size to the Eversolo A6 but much better sounding.

