Helps sound quality and ability to get it louder with out distorting. They are thick though and I had problems with depth and rolling down my windows
I bought 4 of these, and could only use 2. I think the 2 speakers without them sounded better, so I cut a 2' diameter vent in the back of the baffle. In my application with just a head unit (low power) I think these sealed off the back of the speaker too much and it couldn't "breathe/flow". Probably best for high powered systems that can overpower the static air of a sealed back.
from Woodward, OK
Did exactly what I wanted it to. I installed door speakers in my classic truck, and I knew I would need something to waterproof them. Fit was great.
Good when used right
from CA Central Valley
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.