Originally Posted by ericnova72
Factory engineered 4 speaker sound systems didn't become a standard on cars until the mid to late 1980's
Factory engineered 4 speaker stereo systems were available by the mid '60s. They may not have been standard equipment, but all the car companies offered them. My brother ordered a brand new '65 Dodge Coronet convertible that had a reverberator as part of the system he ordered with the car. My brand new '72 Dodge Charger came with a 4 speaker stereo system that even had a cassette deck with it.