Clarity and minimal ringing of up to 250/300 Hz cannot be improved by subwoofers, which usually play ≤ 120 Hz [LFE]. Hence, the W371A - not a typical subwoofer, I would say - which will provide huge improvements [from 23 Hz @ -6 dB] up to 500 Hz (-6 dB); with its 14" front closed box + 12" rear reflex box woofers. This, not only with regards to lower distortion at increased max. SPL.
Certainly, one would require to match each main loudspeaker with a W371A, due to increasing directivity above 100 Hz. ^^
Yeah, for sure, the W371 is very much qualitatively different from subs. Many rooms have issues all the way up to 500hz, and subwoofers can't help you at all there... hence the motivation for that system. Only bad part is the price.
Interesting. What application? Home? Studio? Home theater?
My main system is used for both HT and music, as I live in a condo and simply don't have space for multiple systems. So they will be L/C/R there. I also love surround music. Currently I have Neumann KH80s for surrounds and heights, and the goal is to eventually have 8351B L/C/R and probably 8341A surrounds, and just use the Neumanns for heights. Budget doesn't allow buying all Genelec right out of the gate, unfortunately. This does mean I can't realistically use GLM for the entire system, though I have been pondering whether it's worth it to let GLM correct the speakers it CAN reach, before running Audyssey on top of that(restricted to 500hz or something with the app, probably).
A future upgrade will probably be Dirac + bass module via a Monoprice HTP-1, or some other similar option, although I have no idea how GLM with Genelec subs would compare to DiracBM + say, rythmik subs. I do know that the Genelec subs seem damned expensive for their speced output levels, that's for sure.