The E7+E9 has a line out as well as a headphone output, but they're both on simultaneously - I guess you could switch the speakers off when you just want headphones, and turn down the headphone output when you want speakers (the volume control won't affect the line out, AFAIK). The ODA only has one amplified headphone output, so you wouldn't be able to do that. What I've done is connect my speakers to the computer's onboard soundcard (they're not great speakers, so I don't mind the slight quality reduction) and my headphones to the DAC/amp, then I use SoundSwitch to switch between outputs with a hotkey - they're 5.1, so I couldn't just connect them to the Fiio's line out.