i bought a pair of subs for my truck, later to notice they sounded horrible. After many days and many checkups i came to the conclusion that i needed more air space then wat i had. since its a truck i used the skinny bos that goes under the seat. it has about .70 sqft and the subs require 1.25 sqft to operate well. the guy that sold them to me said to try putting some polyfill inside the box to increase airspace but i hesitated since it seems odd to me. does this really work or is it bolony. any help is appreciated!!!