The original Bose idea (before they went commercial) was to make a speaker with deliberate roll-off beginning at a very high frequency (I seem to remember 200 Hz) and correct it electronically. As sean says, GOBS or SUPERGOBS of power were necessary. The electronic equalization must, of course, be exactly matched to the speaker: since Bose made both he could do it.
Marchand makes good stuff, and does not engage in highway robbery.
Marchand makes good stuff, and does not engage in highway robbery.