Question about Audioengine D1 24-Bit Dac

In the system settings of the operating system, the volume fully up? Which resistance version of the DT990 Pro do you have?
For me, too, the volume is only just sufficient. The tool "Hear" - Prosoft is the developer, if I remember correctly - brought me relief and generally fuller sound. Also note that the D1 has a certain break-in time - I would say between 50 and 80 hours of playing time - during which it becomes significantly louder. However, it should not be quieter than the normal jack socket of the PC, even at the beginning.

Volume is on max. have the 250 ohm version. have sa device since Friday 1.2.2019 try villeicht wirds besser nach einer gewisssen Einspielzeit.