well i turned my h/u off and turned it back on and now my sub doesn't work. so all of yesterday i checked everything. its not the rcas. i tried to blow one of my old 25w door speakers and i took like five minutes to blow it. but my nine.1 should be putting out 450w at 4 ohms . and i hooked up my fi q to my friends amp which is 600w at 4 ohms and my sub didn't work . so did my possibly broken amp break my sub too?