The E9 can hold its out in terms of volume and output against a lot of models out there that are more expensive. The problem is not found in ample volume, but in presentation. The E9 lacks the spacious and airy sound to keep up with the big toys like the HE500 and LCD2 and similar relatively easily driven headphones that do not require a ton of power to get good sound ( but do require that vast power to get the very best sound ). My HE500 sounds darn good and loud out of my Cowon J3, but it lacks the spacious and dynamic sound and clarity my home pc and Fiio E10 provides. The E10 can drive the HE500 wonderfully loud but again is no where near dynamic or large sounding enough to justify use with Orthos. You will miss a lot IMO
The E9/10 combo is excellent for starters if you cannot afford anything known for a spacious sound. I am currently experiencing this problem right now with my HE500. I simply cannot find a reasonably priced amplifier with exceptionally large sound qualities that will make the HE500 shine. The E9 falls short, but provides plenty of volume, again even the Fiio E10 dac/amp provides sufficient volume. I think the Lyr is overkill.