I had a friend send me some 6.5" woofers - one has a paper cone, one has a polypropylene cone. I thought'd be a fun test to compare the two. Have a listen to my samples below and let me know what you think. Also check out the pictures. Obviously the kick is mixed way up so hopefully you can hear (or feel) a difference.

http://www.jyaf.com/4bob/subkicktest.html
_________________________
Justin
Site Admin
http://www.elevenrackpresets.com