Great comments Skyline! You nailed it w/ your description of the difference between listening in the carpeted room, vs listening in your living room w/ hardwood floors. I think hardwood, concrete, or tile floors tend to make the highs a teeny bit harsh in the ER18s. Since mine are going in a room w/ tile floors, like I said earlier, I'll be looking for some way to implement a huge area rug. It's going to be tough because I'll have to move my pool table to do it, but it'll be well worth it!
It's so difficult to describe the differences between the ER18s and the Statements w/out making one sound worse than the other. The biggest problem w/ doing a 'sound off' between those 2 speakers is the fact that they both have their own outstanding qualities. IMO, the ER18s are more detailed in the mids and highs; which would lead someone to believe the Statements lack detail, which they don't. And the Statements have more bass; which would lead someone to believe the ER18s don't have good bass... Now, this is where I'm a little undecided. I have to spend more time listening. For my personal preference, I think the ER18s could use a bit more 'thump'; but I've only had the one session at the demo, and that opinion might change completely once I get them in their intended room. One guy described the bass output of the ER18s as 'a bit schmeary'. Sounds harsh, but it's a good way to describe it if you use the term in the most mild sense.
After I listen to them, I walk away and in the back of my mind I want to say I like the Statements better. But, then I listen again to the ER18s and I'm so captivated by their definition that I can't. I think a huge part of that is my personal listening style, which is also why there's no perfect speaker; it's subjective.
Here's Paul K's comments, "I tend to listen with an average SPL in my sweet spot of ~80 dB, pretty much like you, at least for orchestral music. On smaller ensembles, like string quartets or jazz trios, I might turn it up more". (Just FYI, Paul wasn't speaking to me when he said "pretty much like you".) This is spelled out in the ER18s. For example, don't play Metallica's Dyers Eve at 3/4 volume and expect to be wowed; you won't. As a matter of fact they do it terribly, even to the point of falling apart. The Statements on the other hand were made for something like that. But, if you listen to the style of music that Paul is referring to w/ a more layed back approach, the ER18s are a better way to go.