d_c

I'd go no lower than 8cuft (also slightly depends on split-coil or overhung version) but I'd shoot for 10-12cuft at the least.

It's for the overhung version he has for sale above and It needs to get up to the back of the middle of the chair sitting on a riser, so that is perfect.  And no, Scott, an ass-fire riser mounted sub is not an option!     We are debating less sub and small amp vs. beastie sub and big amp.  He just wants the one driver so the xxx is my first choice for the price.  

Hey Ricci, you mentioned the xxx would perform better in a larger sealed.  What size did you have in mind?  I'm helping out a friend with a nearfield sub and am hoping to use one of these little fellas you have here.