After spending four months abroad and having listened to a plethora of new headphones - the HD 800 and T1 headlining what I've heard (on a Beyer A1 amp) - I've come home and given my speakers a long-awaited listen.
They're definitely not in an ideal setup right now - I had to move three other pairs of speakers from in front of the right one, and both are about 4" from the wall in a very cluttered 12'x16' room.
This is my main system:
Sony DVP-NS500V CD/SACD player (replacing an NAD 5325 that died)
Carver C-11 preamp
Carver TFM-15CB amp powering the tweeter, mid, and mid-bass
Adcom GFA-555 amp powering the just the woofers
Infinity Renaissance 90 speakers (reviews
here; tech specs & photos
here)
Total spent on putting this system together: Under $1100, everything except shielded interconnects and 12 Ga speaker cable from Monoprice was bought used. Less than the cost of either the HD 800 or T1, and that's before you even get to amp'ing them or sources...
I just got an Adcom GFS-6 speaker selector today in the mail for all my speaker selecting needs, too. I'd need two if I wanted to use it for biamped speakers though. It'll be fun to use and make blind testing relatively easy to try.
Anyway, obviously the speakers are in about the worst positioning I could put them in - yet I'm blown away by them. I've forgotten how good they really are. Frankly, the HD 800 and T1 (So far as I can remember them, which admittedly isn't a very good way to compare. I do have my HD 600s, which I've listened to and compared to all parties.) don't even compare. They're inferior in every way except preference things, like portability, tonal preference, and just plain being speakers vs. headphones.
Up and down the entire spectrum, everything is more detailed - in particular, mids and highs sound so real - even sitting so far axis it's a bit unexpected to hear such realism - that it's incredible. It's kind of like those who talk about the "Sennheiser veil" being removed when trying brighter headphones - except it's removing the veil that the HD 800, T1, DT 880, K701, etc. have... Each individual sound is so much more precisely located than any of the 'phones I've tried - and of course, being speakers, I prefer the (perhaps arguably) more realistic soundstage (which, by the way, properly set up extends all around you, not just in front). The sense of depth in the soundstage is unreal. And by unreal I mean really, really realistic sounding.
Perhaps most striking to me after four months of headphones only is how effortless the sound is - granted, I haven't pumped them very loud yet, but at low to moderate volumes, it feels like the speakers aren't even trying - the sound just emanates from them. In particular - the bass is just "there" - effortless in a way that neither inferior speakers nor any headphones I've heard have provided.
I should add that they're incredibly dynamic as well. That's one of the reasons I like these hybrid planar-dynamic designs: You get your effortless super-fast transient response and "airiness" typical of planar designs, but keep the high dynamic range and monstrous bass response of good dynamic speakers. The drawback? They make Magnepans look like Klipschorns in comparison, when we're talking about the absolute need for high-current delivery and low-impedance stability. There's a reason I'm putting almost 1000 Watts RMS (they would gladly take double or triple that) into the Ren 90s - and the dynamic capability of the amps (especially the Adcom) is much, much higher than that thanks to beefy power caps. Thankfully, Adcoms and Carvers cost peanuts these days. There are plenty of people who have spent 20x more than me amp'ing these speakers - I don't have that kind of money.
Anyway, I hope my experience with coming back to speakers after a four month hiatus (a six month separation is coming up in less than a week, although I'm going to take some bookshelf speakers with me this time) adds to the discussion and collective experiences here.