Right. I guess my main concern is double amping the Schiit since my preference is to use the Yamaha receiver and what sort of impact that will have on the Magni/Asgard. I would hate to negate any improvements over the E17. Though from my brief test with the E17 double amped to my receiver, it seemed fine.
After some reading, you can perform a line-out with the E17 using the L7 attachment, then connect to a line-in on the receiver, and connect the external amp via line-out. That will bypass both the E17+receiver amplifiers. You can then connect headphones directly to the amp. That way, you are still able to have the functionality of your receiver and have separate amplification for your headphones.
Start with USB into the L7 attached to the E17.
Then connect the E17+L7 via line-out to a free line-in on the Yamaha.
Then connect the Magni/Asgard to a line-out from the Yamaha.
Last, connect your headphones to the amp and enjoy!
Edited by modulor - 1/24/13 at 9:11am