You do not have to use the DG's surround sound features, just leave the Audio Channel at "2-channel".
Audio quality wise the DG is about roughly equal to the E10 and costs a lot less.
The only advantage of the E10 is it can drive headphones up to 250-Ohm to 300-Ohm, where as the DG is limited to around 150-Ohm.
Or the other advantage for the E10 is if you have very low Ohm headphones, like under 32-Ohm, your HD380 Pros are 64-Ohm?