The best speaker you ever heard?

One of the most impressive systems I ever heard was a pair of huge Soundlabs, can't remember the model as it was 20 years ago, but the amps were Classe 400W monoblocks, pre was audible illusions modulus 3a, and don't recall the front end.  The speed, detail and transparency were sublime.  I was a Maggie owner at the time so I found it easy to fall in love with those Soundlabs.

Wayne Picquet refurbed original Quad ESL's.  I've had a pair about four years now. 

Either every other speaker is right and the original Quad is wrong or...... 

I used to love the Quad ESL's with warm tube amps.  My tastes have changed greatly over the years, but I do have great memories of that speaker.  

Charney Audio companions with Lowther Dx-65 driver.  Folded, curved, back loaded horn with incredible dynamics, linearity, coherency, immediacy. After 45 years in this hobby I realize single-driver speaker systems sound so more lifelike than anything else. If your in the nyc area you must go audition these.

Funny as that's what drew me into the Vandersteen line of speakers. They were the first multi driver dynamic speakers that sound nearly point source.  That's also a reason I have never heard a subwoofer based system that is coherent to me.  Double subs, set up the way they are supposed to be etc....  I've just never heard them integrated perfectly.  I don't know if you can regardless of how it's set up with meters etc...  JMHO.  I've heard so much about Lowther, but never heard them.  I have never been in love with the AN speakers or others that are similar as they do midrange extremely well, but the highs and lows just aren't there for me as you can't ask a driver to handle that type of range.  How are the Lowther based systems on the frequency extremes?  Can they really give you sub 30hz bass that is tight and doesn't bleed into the mid bass or even mid range? I do want to hear a pair as it's so hard to believe that you get a true full range sound.  I have a friend who's system I haven't been able to hear (he's on the other coast for me) and he said he loves the Lowther driver.  He designed and made his own cabinets and crossovers.  His main system is Vandersteen though.  Very interesting designs and manufactures in this thread.  I've personally gone out can listened to many of the posters speakers that I've never heard before.  Thanks to all for sharing.  Appreciated.