Well I bought the E6 on a whim and it just arrived today. I'm impressed. It's definitely better than the E7 with an iPhone LOD and Triple Fi's. The soundstage feels a lot more natural - it's definitely easier to picture the instrument placement in your head while also feeling a little more spacious. The bass is a lot more tight and defined (I use EQ2 to counteract the Triple Fi's drop in bass, and Level 2 on the E7). The E6 also wins in the treble department, where it's clearer and more detailed. I really can't find a single downside to it vs the E7...

They're better than any other PC Speakers I've ever heard, and are powerful enough to fill a small room. But that's about all the praise that I can give their sound, and it's not like PC speakers set a high bar.   The sound out of these speakers is very disappointing considering their price and all the rave reviews they've gotten. The bass is extremely muddy and lacks anything that even resembles accuracy. Mids and highs are distorted to hell and back. There's no detail in any part of the spectrum. Music just doesn't sound...well..."musical".  ...