First off - http://www.head-fi.org/t/596233/buying-portable-or-in-ear-headphones-seeking-guidance-dont-start-a-new-thread-ask-for-advice-here
http://www.head-fi.org/t/478568/multi-iem-review-278-iems-compared-astrotec-am-800-dx-60-added-03-31-13-p-659
The Sonys have far more kick and texture (and emphasis), just a more expansive sound in terms of dynamics and stage size. Both sort of have a upper mid peak but it goes on into the treble with the Sonys while the Etys remain relatively more linear. But the lighter, more up-front and focused presentation of the ER4s make individual details and tracks easier to discern. tl;dr - pretty disparate sigs.
Interesting. I thought they would be similar considering their graphs are very close, and they're both analytical studio models. And the 7550s have been described with terms that usually describe the Etys. Only difference I expected were bass and soundstage due to the different designs. Thanks for the insight though.
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