ya you need to take the sub out, fill the holes. turn the sub and make new holes. and dont strip it, polly fill with decrese the net area which then changes tuning
the x, zv4, and nighshade 3 need a low tuning 32htz is good, 1 more 3100. and im almost posative 6-6.5 cubes per sub is more than plenty if there anything like the x and zv4
the 200.4 is an awesome amp. the only person i have ever seen have an issue with 1 is ken. awesome amp but my only problem with them is there the same size as a damn lincoln towncar