i opened my front left and right speakers for my hts and didn't find any polyfil. my question is..would my speakers benefit from some type of filler or are they engineered to sound their best as they are? here is a link to what my speakers look like and some of their specs. http://www.circuitcity.com/frame1.jsp?BV_SessionID=@@@@1403297813.1044466985@@@@&BV_EngineID=ccegadchhhhjimlcfngcfkmdffhdffg.0&upper=head.jsp&lower=frame2.jsp&department=Home+Audio&category=Home+Speakers&right=productsearch.jsp&left=leftchildcat.jsp by the way they came with my hts package.