Oh ok...I think I see what you are looking at. Are you looking at the power connection on the amp itself?
Anyway, if you need a switched 12volt wire you can use pin 5 at the radio harness. It is violet/white at the factory radio harness. Connect this wire to the white wire at the amp and your HK amp will be on with ignition. Look at this
You could always just get the aftermarket wire adaptor to make it easier!