What is a "transmission line" speaker?

Maybe I'm a dummy, but I don't know what differentiates a transmission line speaker from any other type of cone drive speaker. Please explain.

jphilips11-21-2002 7:26pm

jphilips OP Details Discussions Posts This discussion Message User 27 posts 11-22-2002 at 05:27pm Copy Comment URL Report Comment Edit Delete Thanks to you all, especially Sean. Another audio mystery solved for me. I am very interested in Meadowlarks for my bedroom system.
jphilips OP Details Discussions Posts This discussion Message User 27 posts 11-25-2002 at 07:02pm Copy Comment URL Report Comment Edit Delete Thanks again to everyone. Gotta pretty good thread started here and drug in several of the 'Gon faithful. As usual, thisngs are not as simple as they appear.