Total opposition of a medium to sound waves. Equal to the force per unit area on the surface of the medium, divided by the flux (volume velocity or linear velocity multiplied by area) through that surface. Expressed in ohms and equal to the mechanical impedance divided by the square of the surface area.
"I traveled the US and over seas with my show group and made several recordings during the 60s and 70s. I went through some of those 45records and they just were not playable due to being moved around. I really wanted to put them on cds for my kids and sent them to a couple of studios with very little luck i decided to send them to CVC and what ..."