common ground RCA's -> floating ground amp... Do you see a problem here?

[C-Dawg 10+ year member]

I soldered a 6pin DIN connector/ adapter for my factory Volvo H.U. into rca's for hookup to an aftermarket amp. The RCA's are connected with a common ground, the amp is a "floating ground" amp, whatever that means... Is there a problem here? IS there a common -> floating ground adapter?

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