I know this is an old thread but I believe that Eosone 400s (which I own) didn't get their fair shake due to the fact that Snell has already made this exact same speaker model "E" a decade earlier and the Snell still sounds better. I own the Snell E3 and when you copy a speaker that highly praised and as well known as that, you leave little room for praise. Especially when you can't even improve on the stolen idea plus made a larger cabinet to boot.
So if Def Tech made a close copy of the eosone then they too attempted to borrow existing design from Snell E series. The Snell E is one of the only manufactured speakers that are not intolerable, of course they still can't compete with my main speakers, but they will hang with the best of them made before 2000.
The eosone are not bad but lack the control of a well designed speaker, I'm not a polk fan although I own a pile of them, I did not buy them for my own use but rather took them in for cheap in hopes to resell for a few extra $.
I can say that I thought the overall design was terrible and they needed some rethinking of how they were constructed. Making the top piece removable was nonsense plus the huge ledge they had looked awkward.i made a new top in black lacquer finish and glued and screwed it on. The bottom was just a bad so it too was removed are placed with a much more modern wrapp around foot the front grill was remade to just cover the speakers and not go to the bottom giving it a smaller look. They wete Herman Munster big and ugly so that's why they failed. Can't expect much when you copy another speaker and can't even match the sound.
The Snell does provide biwure and also has a control for the rear tweeter