I own Eidolons and listened to the Diamonds about 3 years ago at the dealership where I bought the Eidolons. This was not a back-to-back comparison. However it was immediately clear that where the Eidolons are laid back, the Diamonds were considerably more resolute throughout the spectrum, and a bit more dynamic. They had more, and deeper, bass due to the longer throw woofers, and the tops were quite a bit more open and extended. It wasn't possible in the room to judge issues like bass integration around the crossovers. The Diamonds sounded like the more refined and expensive of the two, however the dealer owned Eidolons himself, and said he personally preferred them to the Diamonds, which he found to be more agressive and less musical than Eidolons. YMMV of course.
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