macaltec,
I've got the Reference threes of these (I think may be Series threes?). A 3-way design with a polycell tweeter. Look just like these minus a driver. Really nice speakers rated at 6 ohms, they don't strain my amp at all. In my opinion, they are a well-balanced and clean-sounding speaker, very neutral.
Due to a side effect of a non-ear injury (nerve damage), I've developed some hearing quirks. Occasionally, when the side effect is acting up, the tweeters in my beloved Boston Acoustics A-70s and my Design acoustics PS-10s cause me too much pain to listen to. The Infinities, sporting that Polycell tweeter, have yet to cause this reaction. The polycell isn't anything like an EMIT-R, but that doesn't make it a bad thing in my opinion- just a different presentation of the highs. most likely not as bright.
Mine may not be as sharp as mr bowties with the EMITs, as they may be the "Series", not "Reference" threes, I'll dig them out to verify tomorrow. I'm guessing the drivers are all similiar except for the tweeter- same look, the black graphite cones look the same, I'm pretty sure that's what the cones are made of. Sorry for not being able to be more specific. Maybe the "reference" moniker is reserved for the EMIT step up over the "series" poly?
Speaking of hearing issues, I played these for my uncle, who's afflicted with hearing loss from a childhood injury, said these were clear as a bell when he heard them, and smiled when I played them for him (his biggest issues with speakers are too-bright, screechy highs and boomy and/or muddy,sloppy bass).
My next test is to find something my father, who recently lost 80%+ of his hearing, can listen to. He's yet to hear these, i'll let you know how it goes.
ps- By the way, I had decided to sell these to make room for some other additions, but am now having second thoughts as they are such a pleasant sounding speaker. It might just be the neutrality that has won me over.