It certainly would be better, but it still won't be quite up to par as a regular subwoofer. Bass amps tend to have their boxes tuned to around 60 hertz, so you get lots of sound at that frequency and up, but anything lower than that and it will bottom out like crazy and may ruin the speaker. It will be a decent temporary solution, but still save up for a good sub with a lot of excursion, decent power, and goes low.

-Joey