Some people really have a thing against baffles, but having ruined aftermarket speakers with no baffles, I can't not use them. First, they make a great gasket between the speaker and whatever it's mounted too. They're easily trimmed. Then I just start with a hole at the bottom underside of the cup for the wires, listen to how it sounds, and then increase the size of the hole. You could take off 75% of the cup and it would still keep most of the speaker dry if your window seals are less than perfect.
Good, if you need them
I installed these with new 6.5" speakers in the rear doors. I'm not sure it was necessary, but I went with the recommendation. In retrospect I probably wouldn't use these again. New cars shouldn't have water issues and I'm not convinced the sound is improved. Just make sure to cut the hole/port at the bottom (side of baffle if looking at it like a cup) so that any water would drain and bass isn't hindered.
from Sierra Vista, AZ
Perfect fit. Great product!
from San Antonio Texas
Improved sound quality.
from Oronoco Mn
Used before I really like how they clean up the music