But you're missing the point, he's not going for an all-out full blown system, he's looking for a tight daily system. When you start looking at high end subs, of course their is going to be huge differences. I mentioned the enclosures, as far as environment, again, it's a daily setup, it'll certainly be in a standalone box in the trunk of a GP. Regular, low-budget average subs, are typically going to be as i stated. I've messed with kickers 10s, 12s, and 15s, and they're pretty standard and pretty much i stated.
Again, key point: daily setup.
That's one of the reasons I stated the Skarr sub probably wasnt the best fit for him. Skarrs have huge excursion and play some pretty low frequencies. That's why the same company makes Obsidians and Sundowns, same general concepts, a few different parts meant for different applications.
I mean, in all fairness you're 100% correct, but that's looking at things from competition standpoint, hippokid is looking at things from a "give me something that works" standpoint.