If bi-amping is so great, why do some high end speakers not support it?

@co_jones

Isn’t the use of active sub-woofers bi-amping? (Yes)
I have tube amps, are people still using passive sub-woofers vs. powered ones, e.g. class-d? (I have 2 passive subwoofers with my mains with a Pass x250 powering and 2 high quality class d active subwoofers in room)
No one mentioned the quality of the active X-over. There has to be a wide range in quality. (Yes, I recommend that it operate at least 24bit/96kHz which resolves the range of human hearing) 
Like wise there was no mention of tri-amping. Wouldn’t leaving a passive X-over between the mid and high drivers and actively feeding the bass really be a hybrid? (Yes, Ex my 20.1 Maggies, there is an undefeatable crossover for the high/mid so one is really biamping mid/high and low) It can be done to defeat this crossover and add an additional channel and stereo amp  but the slopes and volume better be right or the tweeter will blow)

I agree, true balanced XLR are the best connections to reject all noise from the line. I use it in all but one (optical) connection. A high quality RCA can be used for short distances but one has to be careful to keep any noise inducing things away such as power supplies, cords, chargers, etc. Use balanced whenever possible. :)

- Steve

I use an Ayre amp and DAC run only in balanced mode.  I use Vandersteen Quatro's that are a semi active speaker (active subs built in).  Richard has been at this as long as nearly any other designer and knows what he's doing.  He measures, builds and listens.  He takes into account everything a designer needs to.  

I personally love the idea of a full y active system.  That's the way a designer wants it to sound. Now if you don't like how it sounds, move on.  My favorite system of all time, regardless of cost is the Vandersteen 7 mk2 with his own amp (speaker cable included as is the passive crossover that's built into the amp.  The amp also has the DBS unit that Audioquest uses (Richard I believe is a co inventor) as well as the well received HRS systems vibration control system and to top it all off, his amp as well as the amps in the 7's has the Audioquest Niagara technology built in.  

Folks don't often realize what's inside a speaker or amp etc...  To me, it's a fully active system as it was designed that way.  Add a pre and run a source into it and then add a top end pair of AQ balanced interconnect and you have a GREAT system, that's simple and sounds outstanding to most of us.  

Everyone talks about synergy and often forget about it when assembling their systems.  

Bi amp?  if the speaker allows, it can sound so much better than not going it.  I do feel strongly that you shouldn't go with two lesser amps as I've never heard system sound better with lesser electronics.  Again, that's just me.  Bi wire, as I said earlier, yes if it's designed that way as Vandersteen and some others are.  It's all in the implementation. 

''If bi-amping is so great, why do some high end speakers not support it? 

Very simple.
Manufacturers building bi/tri-amp speakers if lucky, perhaps, will sell 10 pair per year the most.

Really? Monitor audio sells a lot more than that--I think all their high end have 4 binding posts.