Hey bro Dell-tech,
These come in different models, there's the Audiofile SA-3 and SA-5, and then there's the much better Daiichi LS-32 and the single cube LS-3. And as sir AV said, these have more value than Boses, mas mura na and performs just as well if not better. Better also in the sense that the drivers have a cloth-rubber combo edges, not like the cheap foams that Boses have.
To get a bit technical, the LS-32 can go as low as 200 hz, with a maximum input power of 100W, the SA-3, 300 hz, max input at 80 W. I have both models, they sound very clear and detailed. I can't recall the specs on the SA-5 and the LS-3. I've tested those specs to be true, with the help of Sir Av's test files. It still even had some response below those rated specs. And as sir AV said, a bookshelf speaker would still be better. Sattelites should at least go as low as 100 hz audibly, even better if below that. This is to ensure a good, seamless fusion of your sattelites and sub.
Oh and ahh, Daiichi has an entire line of speaker systems and subs. I'm sure you'll find something that will fit your needs and budget.