Harbeth 30.1 or legacy calibre

I am shocked that you would call them thin. Big, rich and full bodied but still detailed in my experience.

while i prefer the sound of the harbeths, more natural and much more forgiving yet plenty detailed, the legacy calibres are different but quite excellent.  
the biggest difference is that you can put some serious wattage into them with biamping.  it isnt like trying to biamp a two way with an amp for just the tweeter.  one amp would drive the large midrange and tweeter, the other amp the woofer and passives.  crazy excellent bass is possible.  
they also come in active amplification mode as well, although i did not care for the occasional unforgiving sound of the class D active amp driving the ribbon tweeter.  

Planning on bi-amping my Calibres soon. Have a feeling that will be a big boost to an already amazing sound.

Calibre is a very nice speaker. I purchased a used set of the passive version and liked them. I then ordered what Legacy calls Calibre XDS. It uses the Wavelet as the crossover. It also takes the woofer passive combination and swaps them; the passive radiator on top and active woofers on each side. Two channels of factory supplied amplification per side, one for woofers, one for midrange. There is a set of binding posts for the tweeters that require an external amplifier. The inputs are wired directly from amp to driver with no passive crossover parts in the speakers. This is pretty much the ultimate expression of these speakers (each speaker is actively tri-amped) and they are really, really good. The bass that comes from them is anything but thin. They still need a sub to be truly full range, but will certainly dip to below 40 hz without breaking a sweat.

Csm, similar paths. I just got a set of passive Calibres and also moved up from Vapors(great speakers). I’m amazed by the Calibres and hope to someday step up to the XD. I bet the XDS are incredible. What are you powering the tweeters with? Can you bypass the midrange amp if you want to power the midrange and tweeter with an external amp? Would like to see some pics especially of the back.