Yeah thats what i thought i was gonna do but I think im going to do it the easy way sub up port back  i have 21"s to work with but will just 19" clearance be enough for thoses subs  Matter fact Dietz....... i will Pm you  http://www.subwoofertools.com/forum/ported...;Xmax=13&Vd =.1&NumW=3&Vb=18&Fb=28&Qts=&Vas=&Fs=&CE=0  here my newest design 19" tall 16 cubes