A rather common instrument, the piano, goes below 30hz. Erin's Audio measured CEA2010A and has the Micro 3000 making only 75.8 db at 20 hz, 80.6 at 25, 85.3 at 31.5, and 93.9 at 40 hz. That's inadequate until about 40 hz, and unless you're doing some seriously quiet listening, you may as well pour the money into better speakers that will hit 40 hz without help, skipping the sub entirely.
No need to get a monster sub, but this tiny box doesn't impress me as being anywhere near worth the money. An SVS SB 2000 Pro will break 100db at 20 hz and not take up a bunch more space. Get an open box from BB for $650.
But if you can take the space hit, those Klipsch RP are amazing deals. I like monster subs. No need to run them hard, and when you want to pump up the bass for exercise, you just turn the sub up.