My take on musical is when a DAC is able to sound effortless and realistic (and the closest I've heard to this is a very nice vinyl system- sound that was able to fill the room without being placed on a 2-D plane). It should have a deep sounstage, good imaging, and NOT be bright. The Lavry erred toward the sterile, slightly brighter sound, lacked dynamics, drier midrange, and little depth to the soundstage; this is why I did not call it a musical DAC. So it's not purely a measurement of frequency response. I did a comparison somewhere on Head-Case between the Lavry and my North Star and I was going to sell the one I liked less, the Lavry was gone in two days.
It was obvious with my K1000 and HP-2 system. I did not get to hear the DA10 with speakers, but in my experience speakers are more revealing of sources than headphones since they have to make it sound like the musicians are playing in the room instead of inside a smaller space (which is in my opinion easier to do).