the inuke software can be downloaded for free, so you can play with it. while i refer to it as "e.q." it has all the common features (high and low pass filters, various slopes, delay, several bands of highly flexible parametric equalizers, limiters, and so on) and the software is pretty intuitive. the only thing that it doesn't do is allow the "corner" of the filter to be set below 20hz, which sucks if you need a highpass at 10hz or something really low, but there are some tricks than can accomplish pretty much the same thing. for a build tuned to 20hz, such as this one, that won't be a problem.
a big advantage of the mini is that being a separate component, if you add another sub and amp, you don't have to pay for eq twice or three or four or however many upgrades you do. choosing what to buy is confusing as most folks don't know things like what the output voltage is on their receivers, but several folks around here can tell you what to do. i haven't studied this one enough to make a suggestion. the software is pretty good and does all the stuff that you will likely need (high and low pass filters, several bands of parametric equalization, etc.).
while plate amps have their place, both of these solutions are in totally a different league than the "e.q." that you might read about on the plate amp.