I can try and fill MC’s role if you like?
@holmz - you just be you mate. Oh my word.
And you could use the valve springs if you had the correct mass loading for them to achieve <4Hz isolation. If you haven’t tried good isolation on your speakers, you should try it. And you're kinda crossing into territory of the great Geoff Kait, not seen in here of late.
How’s that for controversial?
Again, I think GaN Fet class D modules in an active speaker could be a game changer.