A loudspeaker diaphragm that is coupled to the surrounding air mass by an acoustic impedance matching transformer; that is, a horn.
"Frankly, I had never heard of Windermere, FL until I began searching for a place to have a cherished old LP turned into a usable CD. But after listening to the conversion you just did for me I now know that Windermere, FL is the home of some miracle process that turns the sounds of my youth into the joys of my todays. Thanks. Jerry Greenberg="