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You should install a powercap. Not only will it smooth out the supply (and remove the buzzing) but will also aid ur amp to keep going when low on resources. Another option is a cap and an extra battery. Great for starting the car too!

All u need to do is run the audio lead down one side of the car and the power lead down the other side. Might take some work but it will be worth it. If leads must cross, ensure u cross them at 90 degrees to each other: this stops them inducing current in each other. I know all this sounds...