Really appreciate everyone's feedback, very helpful, especially the reading assignment!
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I've spent way too much time scouring all the pertinent forums all over the web, living vicariously through other's sub experiences. One ends up absorbing the mantras, "Buy once, cry once" and "Go large, or go home" "No replacement for displacement," etc. This can cloudy up judgment. Especially for someone who is just going to buy subs sight unseen/unheard, and just live with them, unless they flat out underperform and/or become annoying to place/tweak/master all settings.
I've gathered all the measurement spreadsheets found on the web and it surprises me just how much capability exists in subs at a price half of what I paid for mine all those many years ago (adjusted 2022 price is nearly $2K, so I started looking for single subs around that mark). Is there a "Moore's Law" equivalent for subs? I have the room and budget to put almost anything in my home. I already bought into the duals recommendation, and now going to embrace the 3-4 smaller subs setup. I would love to see a Carvana-type business model for subwoofers. Enter the tower of subs, buy or rent. Delivery robots handle the moving. OK, not a moneymaker I gather. But still....cool idea.
So I've read some well respected forum posters comment about differing subs sound/tonality. One significantly preferred the "sound" of the VTF15H-MK2 over the VTF3-MK5 (even comparing the sound (not output) of the larger Hsu to a huge Seaton or similarly expensive sub). I read another preferred the sound of the Monolith 12" over similarly priced SVS and Hsu subs. I read one person loved the SVS sound (newer 3000s), called it "deep" bass. I've read Hsu are most musical (due to the Class AB amp).
I do know my 1st sub, an M&K for $850+ in 1996, gave me headaches, so I returned it. Found out the maker of my recently installed (pricey) car speakers also made two models of subs for the home, and I went to the dealer and took one home, never heard it until I hooked it up. Satisfied enough, urge to keep looking was eliminated for quite a few years (16). Not everyone is good at that last part ;o) But the self-imposed pressure of making a good decision correctly just feeds the research lust. But I digress...
Anyone wanna take a stab at describing the differences, if any, in sound/tonality of various ID sub makers? Are there signature adjectives for describing a Hsu, or SVS, or Monolith, or Rythmik, or PSA?