hiflyer, it's been a couple years since i've heard the extremas, &, to be honest, i don't remember the specifics re: amplification. i *do* remember they were great, & that they *do* require lotsa juice. yer monoblocs, at 150 per, may be enuff, especially w/nearfield use, but more important than watts is *current* - how many amperes of current can yer amp output? for example, my electrocompaniet aw60ftts that i'm now using, are only 60wpc, 110 into 4 ohms, but they're stable into loads below 0.5 ohms, & put out >60 amps of current... the extremas *do* demand lotsa current to sound their best.
doug s.