It sounds like you don't have enough power to run the amp, or else it is a built in (MOSFET) overload device inside the amp. the woofer is from your discription blown. when you choose a amp and woofer you need the woofer to be able to handle more watts (MAX) than the amp can give or you will blow every woofer you connect up. you can solve the power outage by fitting a "CAPACITOR" which stores power and provides it to the amp as and when it is needed, or you will need to install another battery for the amp alone.