Originally Posted by makkan00
Few things to consider:
1- since sub fires in the cabin, therefore better sound and clean bass. Immediate gain in db.
2- bass is not going to be solid but a bit boomy since there will be nothing at the back of the sub to give it solid bass feeling.
However if you have that sky hole (mentioned above) and then fit a sub with the box, you will have solid deep bass.
En contraire, a properly installed IB set-up will give the most "solid" bass you will ever hear in a car. It is the relatively small enclosure (sealed or ported) that will make it sound less "solid". The keys to a successful IB install are the baffle, and the selection of the right driver.