There is a $500 difference b/w the two. Are the Kooks really worth an extra $500? The only thing I could gather is that the Kooks are T-304 while JBA are T-409. Also JBA are only 1-7/8” which for my NA car I gather 1-3/4” is better. I also found some BBK that are 1-3/4” but not so sure on quality of those?<?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>