Phoenix Gold Phorum

I'm a new dealer for phenoix in Syracuse, n.y. getting my demo vehicle ready Does anyone have any input on a sealed enclosure . TiElite12d2 The amp will be a ti21300 or elite.5 . I like how deep the elite hits in the Sq ported enclosure but lacks output on certain higher bass notes plus the box is huge 3.7 including displacement. I would like to build a sealed box that will still get that low hit but sound smooth up the spectrum. Just looking for any input from someone who has built or heard one in a sealed box. I have enough room for about 3 cubes. Thanks.