well made, good fit on the speakers. seems to decrease the bass, but with a little work with the EQ, you can compensate for the loss.
May not be needed.
from Cary, NC
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.