OK, I burned them in overnight using the pink noise, as well as using them during my
Seismic Radio show. The frequency ranges seem to have smoothed out significantly, with the bass being less flabby and the treble being less shrill, and the midrange no longer feeling distant. I'm sure it will settle down more, so I'll probably continue the pink noise burn-in over the weekend, but it's probably close enough to it's final character to give some more impressions.
The treble is significantly more pronounced and sparkly than with the EM3. Again, this is a mixed blessing. While there's certainly more life to the high end, there's also more fatigue. I've become very sensitive to high frequencies, and I'm starting to miss the treble roll-off the EM3. It's a tough call. The treble has more life, but it's less comfortable. I'd say that the Atrio is a far more neutral earphone than the EM3. And while the treble seems to match my Etymotics, the bass still surpasses that brand handily.
The soundstage is magnificent. I feel like the sound is surrounding my head, rather than being trapped inside of it...
But this is also dependant on the source. The Atrio is far less forgiving than the EM3, and shows off the limitations of your source hardware very quickly. My Cowon A2 is a tad bit too bright for comfort, though the soundstage it provides is wonderful (thanks to the Wolfson DAC). Unfortunately, I can't use my Tomahawk with it, as it winds up over-emphasizing the treble and becomes painfully sibillant. Meanwhile, the line out of the iriver H120 shows it's severe limitations even further, with a completely compressed soundstage, though the frequency range is more comfortable. I'll have to wait a while longer to test with the Monica II DAC since my builder has been having trouble getting the optical receiver to work. I won't even bother with the line-out from my M-Audio Transit because it sounded awful with the EM3, so I'll wait for the Monica. Ironically, the line-out from my IBM PC's built-in sound card sounds best at the moment (playing audio through Amarok on Ubuntu Linux).
On the bright side, I'd been getting worried lately that the Monica II DAC might not be a great match for the warmer sound of the EM3. Given the Atrio's more even frequency response, it might be a better match. That's a great relief.
I do have to say that I think the Atrio is easier to recommend to the audiophile crowd. It *IS* more neutral than the EM3. The soundstaging is wonderful. I really don't hear any "deficiencies", which some folks might consider the EM3's treble roll-off to be. Everything is imaged effectively here. It's quite remarkable.
Now if my external drive would stop throwing a fit so I can listen to tunes with my better source I'd be a happy man.
