Calling all Vandersteen Fans

A little over a year ago I owned he 1Cis for a short time. While I enjoyed many aspects of the speaker, I found their top-end was a bit ripe and sibilant, with multiple amps. I ended up having to attenuate the treble by 1.5db in order to enjoy them at all.

Lately I've been thinking about how well those speakers produced a realistic decay of instruments, the likes of which I haven't encountered in any other speakers. I'm wanting to give Vandersteens another chance and am considering the 2CE SigIIs, however, it appears they and the 3As have the same tweeter as the 1Cis. That and the measurements in the Stereophile review give me pause. I suppose it could be that I didn't allow the 1Cis enough break-in, or that I was actually hearing upper midrange distortion from their 8" midbass driver

I'm soliciting input from those very familiar with the brand. Would you say the 2 Sig IIs produce a warmer balance than the 1Cis? Do they in-fact share the same exact tweeter? 

Is a 100 watt/ch amp enough to drive 2CEs to satisfying levels in a 26×15' room?

I've never owned the 1's, but heard the 2ci's at a NYC audio show in 1989 and the music was magical -- it just sounded "right" to me.  So saved up my pennies and purchased a pair.  Still remember moving them to my small apartment via 5 blocks via hand truck through Manhattan from the old Sound by Singer as I was way too poor to afford shipping.  Thirty years later I've gone from those to 2ce Sig to original Quattro to the Quattro CT's and now looking forward to hearing the upcoming Kento's.  

Agree w/most of above posters, I didn't perceive what I would describe as sibilance in the highs in the 2's -- but going to the much more expensive Quattro CT's did provide what I'd describe as a more open/extended upper range.  I suspect that you'll find the 2's or 3's will be provide a "warmer" balance and probably fuller sound than the 1's but still retain the wonderful mid's.  Might also consider auditioning with a tube pre-amp and/or power amp (?).  

Can also add a 'thumbs up' to Hifi Buys in Atlanta if in the Southeast region.  Good luck!
Fwiw, I owned the 2ce sigs, and the highs seemed somewhat subdued in my setup, not bright. May have been my room, lack of skill, etc.
I owned the 2ce Sigs and loved them! Was driving them with a Peachtree 220se. I was moving from Milwaukee to NYC so I had to let them go. Switched over to KEF LS50s with a REL sub, and was more than happy for a while.

I've done a bit of an overhaul this past year. I now have the VLR CTs being driven by a Simaudio Moon ACE. Still using the REL sub as well. The CTs are incredible. They've really reconnected me to the music I listen to. I've got a friend who heard the VLR CTs and a week later traded in his 2ce Sigs. The carbon tweeter is that good.

As far as room size goes, I live in an old warehouse in Pittsburgh. My listening room is about the same size as yours. My ceilings are about 13-15 high. I was worried the VLR CTs wouldn't be enough. I was wrong.
The 2's will be fine with both your room and a hundred wpc.
I had an extremely fine sounding Krell KST100 & 2Ci set up in the 90's. I didn't want for highs, sparkle, soundstage, depth, extension or volume. In fact, I had the 2Ci tweeter control dialed at 12 o'clock for a very long time. The 2's are terrific speakers that will allow good components to be heard. 
More break-in, definitely!  I have the 2Cs and the  2CE SigIIs.  The more break-in time, the better!  Once broken in, you will never want to part with them.