Using car audio for home theatre

A quick FYI...

Most HT subs have a lower FS, or resonance frequency than car audio subs. They are designed that way because in room gains are not as extreme as in car gains are. In some instances, automotive woofers suffer terribly in HT applications, often lacking depth. When a HT sub is used in car, in a proper application, it may be extremely heavy on the bottom end. In car, we can mask this by shrinking the enclosure size, and creaing peaks high in the sub frequency (to level the output off, similar to boosting frequencies with an EQ). In home it is too difficult to achieve bottom end that is not there without adding mass to the cone and lowering the FS of the driver.

Are you still looking for a home sub to replace your rca? If so the velodyne 10" CHT sub costs around $400 I think and the 12" CHT sub costs around $500. I'm not sure about the dayton, but some of the sunfire subs range in the mid 1000 dollar area, but put out amazing bass for their size. Here is a review on the Velodyne CHT 10, I couldn't find a review on the Sunfire sub on the web (i have the article though) but here is a review on an Earthquake sub which is one of those compact yet extremely loud subs.