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simply all kind of home ,studio amplifiers have a transformers for power supply,example a home theatre amplifier it works with mostly12v-30v transformer but car amplifiers have no transformers that means 220v-12v transformer its only work with 12 v DC power ,home use current is AC ,So AC TO DC power supply is the one way ,using 12 v DC supply from 220v AC TO DC POWER adapter ,SO Connect ac to dc power to car amp it works very smoothly(ground is must)