I wouldn’t run it on 12v, either. What you need is voltage conversion. A series resistor will only work for a given current, and the current drain of the device could be variable.
You can install a buck converter, available at amazon among other places. In that case, you’ll want to know the standby current if you wire to your non-switched 12v (i.e., not switched off by ignition key) to avoid a battery drain while you’re parked — or wire it into a cigarette lighter plug. You could use a USB to 9v converter, except that your power requirement is too high. I’ve seen cigarette lighter buck converters in the past, but I’m not finding them now.
In every case, you need to be sure the converter will supply the current you need. The radio requires 14 Watts, so a bit above 1.5 amps. Your converter needs to provide 15 watts or ~1.6A continuously.
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