I can scan one for you tonight, but if I believe its .75 for a a fs of 35 hz, 1 cu ft for a fs of 32 hz sealed only
if you call eclipse tech support they will fax you a copy on the spot, they are pretty good about that kind of thing
I have a paid of the 8200's and while the manual says one thing,
bass box pro says triple the sealed box requirement 3-4 cu ft sealed depending on polyfill volume
they are the same as the tc sounds LMT 4100 series just different basket and FAR cheaper on
ebay lol