i'm telling you this from experience, if you're not listening to the dt 770 from a dedicated sound card, at least a xonar dg(comes with built in headphone amp!!), you might as well not listen to them at all. That's why the volume isn't enough. No onboard sound card can properly drive the...

 underpowered when used with a receiver??  wow. I was looking forward to buying a nice receiver for my dt's to amp them a bit, since i am a loud listener, and find them a bit quiet for my taste. but now .. i don't know