With this premium speaker set you can replace the defective original dashboard and rear speaker 1957 CADILLAC. The speaker contains a dual voice coil with a right and a left channel and replaces the original mono speaker in its original installation position. Thus, no special adapations are necessary and the operation of modern stereo radios or converted original radios become possible. At the same time, compared to the original full-range speaker, a much better bass foundation and crystal clear highs are produced, which significantly improve the sound.