Your choice of the most "inert" cabinets ?

The best I have heard move and breathe like an instrument. Harbeth and Audio Note come to mind. 

Those of us who've been in this hobby long enough know that 'resonance' is not a bad word when it to comes to speakers. Am listening to Govt Mule Live now, and my Spendor's resonances sound good as %$#&.

brf, nice 'note'; you're making me b'a'rf ..  tee hee

granny, I'd love to see my speakers 'move and breathe' but I think I'd need some of your LSD to assist my 'vision' tee hee

kalali, concrete is interesting and I'm going to look into it, thanks

Well I have Norh marble synthetic very heavy..I like them a lot..the Andra are also granite....

Max Townshend molds his speaker cabinets from Plaster-of-Paris I believe. That's one reason they are not available in the U.S.A.---too heavy to ship from the U.K.!