One of my primary interests is JBL instrument speakers and that's what originally brought me to this forum. However, I'm finding that there's not nearly as much information offered on musical application speakers as there is on sound system drivers. Am I just looking in the wrong place here, or is there another forum somewhere that specializes more in the things I'm looking for. I recently made a change in my bass guitar speaker systems and I'm purchasing a 15" E-140 JBL. I was inquiring about matching it with other JBL drivers and luckily ran into a Mesa Engineering consultant over on Talk Bass who was helpful. But I wondered if there are other sources online I should be checking out.