My E series JBL's have aluminum Dust caps. I rather have paper because obviously, I dont need the "extended" response. Also I think, Personally, that balck paper dustcaps would look much better.And about the amps, The company is just starting to sell in the U.S. but they have been around for 25 years..........
All my friends- musicians and sound guys alike are amazed at their quality and performance and even more amazed because of the fact that I payed only about $474.00 for each one!!!!!!!!!!!!!!!!!!!

-Don