Since we're taking all things into consideration you should probably note that Audionoob is, in the real world, a subwoofer salesman. My thinking is that he is trying to subtly push you toward a larger purchase which you may or may not be prepared for.

Slumpy is right. Configured properly the 5 inch woofer should yield jaw-dropping, stunning...dare I say, amazing, results.

Good luck and happy listening.