My dashboardspeakers sound fuller
Crutchfield Customer Review (What's this?)
I felt like I needed to take the edge off of my 3 1/2 inch dashboard speakers and these did the trick. I cut a 1" by 1.5" hole in the back and one the size of a nickel on the side (for the wires) so I wouldn't smother the speakers which made a big difference.
Pros: Very thick but pliable. Good Quality.
Cons: No instructions