I had 2 issues with these. 1) The door holes for the 6.5" OEM speakers were ~7". These did not fit well. 2) They reduce the size of the chamber behind the speaker, thus raising the resonant frequency of the assembly. My Polks are not known for their bass. The last thing I want to do is make them have less bass.
Since the inside of my 1.5yr old Ford Fusion was virtually clean and was totally dry after going through the car wash, I determined these were not necessary.
Unless you see signs of water or dirt infiltration inside your door, I would not recommend these. If you do have water and dirt in your door, they may be a good investment.
They do what they should do
Gasket & water protection in one
from Miami, FL
These worked out great for my application - the speakers I was installing had just a little interference with door panel, the baffle was a great gasket to use to give a good, even seal. My previous upgraded speakers did not have any kind of rain shield and the output tabs had rusted off from where they attached to the spider so I want to make sure I did not make that mistake with my new speakers. I used JL C2-650x and they fit perfectly in the shallow depth ones - there actually is room to fit the regular length and that would be a bit more optimal most likely. They appear to be waterproof, I put water in one and it did not seep in at all. My only concern is that the speaker might get hot without room to breathe - I may cutout some of the bottom to take care of that. No idea if they change the sound but my speakers sound good so I am happy.
Could not use these
from Fairfax, VA
No issue with the baffles themselves, other than there was no way to use them. Why did Crutchfield suggest them if they wouldn't fit my car? Now its more expensive to return them than to keep them.
from Kaneohe, HI
Was recommended to use these for front door Rockford Fosgate 6.5" component woofers. I'm not an audio expert enough to understand why they are not used in the stock speakers and why it was suggested for the replacements. As suggested, I did cut out a 1" diameter hole out the back "to let the speaker breathe". I did not do a with and without comparison, but am trusting they will better protect my new speakers and prevent any artifacts that could occur without them. Not sure why they were not recommended for the rear door 6.5" speakers.