Tom Gibbs has posted a review of the Audioengine HD-6 active loudspeaker ($749/pair) at Positive Feedback. His conclusions:
“The HD-6′s, in combination with a good source signal and thoughtful room placement, are as tonally balanced as any small speaker I’ve ever heard, and just might be the last speaker you ever need to buy. Are they the be-all, end-all with regards to small monitor speakers? No, they are challenged by extreme low frequencies—that’s going to be obvious to just about anyone, but “within their limitations,” they offer an impressively good taste of what music really sounds like.”
You can read the full review here.