subwoofer.

me and my mate wired up an amp for his sub in his car, with 50A cabling. connected it to the battery and nothing. Do we have to connect a wire from the remote connection on the amp to the head unit for it to turn on? I don't know a whole heap about amps but i assumed once a 12V supply was...

Hey guys, i've got a gas tank installed in the boot of my car and i was just wondering would installing a sub interfere with anything at all? thanks guys.