The A.R.T. principle
The principal task of an electroacoustic transducer is to generate sound from incoming alternate current. Practically all studio monitors offered today use voice coil based drive units for this purpose. To transmit the motion of the voice coil stiff domes or cones are connected to it. Air is always moved in a 1:1 ratio between diaphragm and air, and always the diaphragm area you can see is the acoustically active area. These two properties are also valid for all the other transducer principles. As pointed out before new tweeters and midrange units have been developed based on the original works of Dr. Oskar Heil and his Air Motion Transformer.
