Has anyone done a sealed setup for these woofers? How are these with sealed? Specs on these are 2.73 cubic feet for sealed. All the searching/threads I've came across are all ported. Finally decided on 4 18" PA-460 sealed, right behind the main listening position with 2 UM18's in full martys for the low end up front. Mounting depth for these are 7.8" and the best I can do is 10" for the enclosure. Will that affect it?