Alan Wolfe from Magico believes that Aluminum is the best material to use for a speaker cabinet, YG Acoustics also uses airplane grade aluminum to build their speakers, but if you are looking for the most advanced, most inert cabinet on the market, look no further than Rockport Tech. No one builds a better "cost no object" cabinet than Andy Payor.
look at the measurements for these two Rockport speakers, performed by Stereophile.
http://www.stereophile.com/floorloudspeakers/904rockport/index5.html
and
http://www.stereophile.com/floorloudspeakers/644/index6.html
as far as i have seen, they are by far the most inert cabinet Stereophile has ever measured. Much better than any Wilson or even the Magico, two companies that spend a lot of money advertising the quality of their speaker cabinets.
look at the measurements for these two Rockport speakers, performed by Stereophile.
http://www.stereophile.com/floorloudspeakers/904rockport/index5.html
and
http://www.stereophile.com/floorloudspeakers/644/index6.html
as far as i have seen, they are by far the most inert cabinet Stereophile has ever measured. Much better than any Wilson or even the Magico, two companies that spend a lot of money advertising the quality of their speaker cabinets.