The Yamaha Sub included on your link has a 6 1/2" driver which is not capable of producing any bass. I thought that Bose was the only company that tried to make a "bass module" with drivers this small!
Look for a sub with at least a 10" driver that is capable of frequencies in the 20-30 Hz range. Check out the subs from Bic America, Cadence X-sub, or the HSU STF-1 for something in your price range with superior performance.