I have built a fiberglass enclosure for my sons 2016 Jeep Renegade Trail Hawk edition. It has been built to fit inside the full size spare located in the rear. I am using a JL Audio 10TW1 sub for this enclosure. After completing the sub I have calculated volume of this closure with speaker displacement to be .45 cuft. the enclosure is recommended for .35 cuft.. Currently it sounds a little boomy with certain music and of course if you play a bass type cd is hits great(son loves that part) but It's not right in my opinion and should have some tight bass when playing those types on music. I believe its due to the enclosure being to big. My question is what kind of material can I put inside this enclosure to test this out to find out if this is the issue? Building a new enclosure is not an option. Any help with this would be appreciated. Remember this is a round enclosure that fits in a spare tire and I am wanting to test this out before I do anything permanent.
Chris
Chris