Annoying Buzing and humming

[Villabee]

I have installed a amp in my Speedster.
Now when i turn on the ignition and start the motor I get an annoying buzzing sound through the soundsystem
I wired the amp directly to the battery and the remote power to the positive on the stereo positive.
Any suggestions?

 

[Dr Honda]

Put a filter on the input. The charging system is dirty on these boats.

 

[Minnetonka4me]

Make sure you are using bR8es plugs too.