Car audio has come a long way since its formative early days. When radio broadcasting began in 1920, vacuum tube radio receivers became available as well, sparking what could be referred to as a "radio craze". Everyone had to have this amazing new technology - many car owners even installed home radio sets in their vehicles as a novelty. This led to the eventual commercial introduction of the purpose-built car radio in the 1930s, and automotive stereo systems have continued to evolve in complexity and performance ever since.  

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