Protection where you need it.
Crutchfield Customer Review (What's this?)
These do exactly what you would expect. Perfect for isolating the speakers from the elements. Exposure to moisture in the door made to old speakers brittle and ultimately fail. I cut a small hole in the bottom for wires, otherwise installation was plug and play. Yes, they cut the bass, but look up baffle in the dictionary before you purchase, ok? Don't complain because they cut sound since that is what a baffle is designed for. If you want full sound (and bass) but still need to shelter your speakers, build a custom fiberglass (or other non-absorbant material) enclosure.
Pros: Performs as advertised.