I was reading somewhere that you should protect your 6x9s because the air from the subwoofer can cause the speakers to over exert themselves or something like that.

What is meant by this? and what would I use.

 

There are foam hats or hard plastic baffles that you would use for this application. Whenever you have a speaker that is open on the backside to the same air cavity that your sub is firing into, the compression created by the sub is going to move the cone of that speaker. The baffle creates a barrier that keeps the speaker from being interfeared with by the subwoofer.

 

What Rob said. x2

I'd add fiberglass to them "foam hats" or "hard plastic baffles". The foam hats aren't bad when you saturate them with resin, but I still through a couple layers of mat on them.

 

Sounds good, thanks for the help

 

who needs rear fill?!

 

Not only for rear fill, but I also use them for mid-bass.

 

Midbass will be much improved when properly covered.