Im about to build my first sub with a shiva sub, 16" sonotube, and a 250w amp. My room is about 2500ft^3 with 3 openings to other rooms. Will the shiva be enough? Also, I dont quite understand anything about tuning a port. Is there a good site that I should look at? Where do I mount the Amp? Also, I want a ported box that will deliver very good SQ and lots of SPL. Any design recommendations?