The Merlin VSM mentioned by Pubul uses active eq to set what is IME the standard for extention/definition from a reasonably neutral, smallish 2 way box. There certainly could be a non eq'd 2 driver, 2 way out there that can match the VSMs, but I definitely haven't heard it.
OTOH, if you want parlor tricks -and can abide more deviation from neutrality - the original Red Rose mini monitor skillfully gooses the midbass to enhance its already impressive low end output (for a tiny box) and generate a better illusion of bass than anything I've heard remotely near it's size.
The Gallo Ref3 series uses 3 drivers in a 2 way configuration (the tweeters run full range) and allow use of a 2nd amp to "co-drive" the woofers on a second pair of voice coils. These may be the champs per your specifications.
Finally, as a technical matter, you could mate a subwoofer(s) to a single driver speaker and meet your description. To give some perspective, I get flat resonse +/_ 3db (relative to 80 db) from 25hz to crossover from a pair of Velodyne SPLR 8" subs run through an SMS -1 cross/analyzer/PEQ. I use a number of different mains, but I haven't yet tried a single driver. I'm also told that the Magnepan MMG wall (which can be stand mounted) and some electrostats also operate without a crossover. This set-up will win hands down!
Marty
OTOH, if you want parlor tricks -and can abide more deviation from neutrality - the original Red Rose mini monitor skillfully gooses the midbass to enhance its already impressive low end output (for a tiny box) and generate a better illusion of bass than anything I've heard remotely near it's size.
The Gallo Ref3 series uses 3 drivers in a 2 way configuration (the tweeters run full range) and allow use of a 2nd amp to "co-drive" the woofers on a second pair of voice coils. These may be the champs per your specifications.
Finally, as a technical matter, you could mate a subwoofer(s) to a single driver speaker and meet your description. To give some perspective, I get flat resonse +/_ 3db (relative to 80 db) from 25hz to crossover from a pair of Velodyne SPLR 8" subs run through an SMS -1 cross/analyzer/PEQ. I use a number of different mains, but I haven't yet tried a single driver. I'm also told that the Magnepan MMG wall (which can be stand mounted) and some electrostats also operate without a crossover. This set-up will win hands down!
Marty