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

Biamping offers significant SQ improvements at the cost of more amps - usually the transformer is a big cost, beyond the engineering and QC.

Some speaker manfs. do not want you messing up their carefully designed cross-overs; others may worry you will not spend the $$ for multiple quality amps; and others have a narrow focus on drivers, etc. while missing the big picture.

The trend now is for manf.s to build quality class D amps into their speakers and design the amp to optimize each driver.  Meridian was a pioneer in that and in sending a digital signal as far down the listening chain as possible.

arh - the 3.7i's are worth the upgrade

AND the crossover is now very good - no biamping needed (or allowed)

Dick Vandersteen has a white paper on biwiring posted somewhere

I go bi-amp tho

ctsooner - I'll rephrase your comments a bit:

if a renowned audio engineer and speaker designer has designed their speakers to be bi wired and or bi amped, then it is very wise for a consumer to follow their directions

Dick V. is highly respected and has been working towards maximizing SQ in his given designs for decades - it took me months of careful listening for hours every day to decide to move from Vandies to Maggies (and I understand if others make the opposite move)