I have soundstream pca4.400 amplifier hooked up which turns on properly, and a clarion 600 w srw 1243 sub which wont work. I just took it down to autobahn to see if all the connections were right and they said they were. They said it might be the sub just not working, so is there any way i can check to see if the subs busted? I know i can try another sub but i am trying to find a quick fix.