The coil winding attached to the diaphragm of a dynamic microphone or loudspeaker.
"Thank you so much for your prompt and personal attention to my orders. They sound wonderful! I was especially impressed by the scratch sounds you were able to remove from the old 33 rpm and the loud on/off pops you removed from the tape recording. I'm just sorry you had to sift through the sounds of all those inane antics from my childhood! ..."