Infinity crescendo cs-3009 polyfill/foam?

Hi everyone, I have a pair of infinity crescendo cs-3009 speakers. They are huge 4 way speakers, ported, each cabinet has two 10" woofers, 6" midbass, 4" midrange, & a 2" tweeter. My first question is the area behind both woofers was bare, no poly fill what so ever... does anyone here know if these kind of speakers were tuned to need no poly fill sheets or should I treat the cabinet? And secondly I want to replace the polyfill in the enclosed tubes the mids sit in, I have the internal volume of each enclosure how do I go about replacing the exact correct amount? I have all the information on them if anyone needs more info also I'll provide a links to pictures.

briandumm2955.imgur.com/all/