You wanna be careful doing this. Are you planning to use a car amp?
You need the cable to be of a large enough CSA to take the load that is gonna be pulled by a 200/400/1000 watt amp.
At 230v using a 1000w amp, ohms law states I(amps)=P(watts)/V(volts)
so, 1000/230 = 4.4 amps
At 12v however
1000/12 = 83.3 amps
This is a lot of amps. This equation is dona at RMS value not peak.
I run a car sub using a standard 230v amp, i say its best to leave car audio in the car TBH.