Hello, I just bough and had my JBL 14001 installed with my FoxBox, my question is does the FoxBox need polyfill? I bought a big bag of polyfill but does it sound better with polyfill our with out? Pictures of the amp installed in the back rear wall are in my album. Any help with the polyfill question will be great, thanks.

 

The general rule of thumb is 1 pound per cubic foot of airspace. So if each chamber is .6 cubes then put in a little more than half a pound in each one. And yes it will be worth it.

 

I filled mine with it. I put a 1/2 lb in each chamber.

 

Thanks for your help!! Take care.