passive micro-monitor designs for desktop 2.5-channel?

Has anybody designed a teeny (as in 10cm/4" midwoof) 2-way passive with a nice accurate sealed-box response from 200Hz and up or so? I tried searching around but didn't find much except a few DSP ones. No particular budget, just looking to see what's out there in general that matches the goal.
 
Even for near field if only using 1 subwoofer, I’d target no higher an F3 of 120hz from your left and right………too much male vocal content below 200hz to share the distance and it sounds very unnatural.

You can use the quarter wavelength distance to guide you on how far away the subwoofer can be from your mains. In the case of 200hz, 16” for the sub driver……….28” at 120hz.
 
That's true mayhem, but I'm working on something that goes all on the desktop. Picture a computer monitor sitting on a bass unit pointed right at the user's head, satellite stereo units on short articulated arms, max. acoustic center spacing from the bass driver right around 16".
 
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That’s fine…..just apply the 1/4 wavelength where the center of the left or right shouldn’t be further than 16” from the center of the mono sub……that’s a 32” sound stage in the near field. If you’re going to be that acoustically small and listen at 1 meter or less, for go the two way and go with a small 4” full range solution as off axis behavior won’t matter……the phase coherence of the point source will easily trump the fwd lobe of a two way.