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

viggen Details Discussions Posts This discussion Message User 838 posts 11-22-2002 at 09:24am Copy Comment URL Report Comment Edit Delete I am not sure, but I think the speaker in the middle of this webpage is a transmission line? http://www.exoticaudio.org/PAGE12.html