Anybody here remember the vibrator? No not that. How do you think they got the hundreds of volts required to run the tube type radios in those old cars with 6 volt systems?

Modern quality head units may use switching power supplies to do what the vibrators did. That is, step up the voltage of the power supply and thereby substantially increase the power output of the unit. True some power output claims are highly exagerated, but head units with true 30 watts RMS per channel into 2 ohms are available. Tod

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