Improving B&O subwoofer

Hi everyone,

I read this on another audi forum and just wondering if anyone’s tried it.

I’ve seen people have used sound deadening to cover the holes in the rear deck where the sub goes.

I was thinking of doing this and maybe stuffing it with polyester stuffing to improve bass.

according to this guide the sound deadening helps quite a bit, and I’ve read on focus st forums that stuffing the housing with stuffing helps with bass. So I thought maybe combining both of these could help.

unsure on wether it’s worth it so I’d like to see if anyone’s done something like this. 
 

thanks!