Why are hi-end active monitors not more popular?

You forgot another really popular option (not on this forum) but Squeezebox into Meridian digital speakers. This is the simplist system.

Most people shy away from the high price of admission for active speakers. They think it is really high but when you look at the expensive speaker cable, amplifier, interconnects, stands/shelfs/isolation/powerconditioning, power cables, and even preamp. Those components will be more expensive than an active system typically, as you move toward a full range system then the two options equal out as the choices get smaller.

The Big ATC's and the active Pass Labs Speakers are pretty impressive.

My only reason: I don't like the sound of solid state amps. Otherwise ATC would be high on my list.

Good concept / bad implementation is the usual problem.

CDC,

I am really unsure about your rationale unless you have listened to a number of active monitors (good ones). I'm not talking about bad active monitors, I'm talking about really good ones. Have you seen or heard any good ones. Thanks in advance.

i run linn espek speakers that are active, but with outboard amps. you get the active advantage, but can upgrade within linn system or use other amps with the proper equipment. the portability factor you like is not there tho. however, the linn system removes the crossover in the speaker making for a truly superior sound.