(air suspension) you can have them. They work great.
perhaps re-stain the wood, if you want them in living room.
I bought them in 1977... yes, I WAS ALIVE THEN !
I'd guess they'd go -as low 30 Hz...
STERO Speakers— ALL the Manufacturers LIE
when they claim they ill go to 20Hz... When you TEST them—
you'll see that -very FEW will even reach -down to 45Hz....
-FEW People -have EVER heard— any sound under 40Hz.
(perhaps artillery shells)
There is a WHOLE WORLD— of Audio, They DO NOT KNOW,
and it is very wonderful....
Wow, antoher of your great models my friend. I'm not fond of music but I can appreciate a good 3d model 
!! 
