Ok I'm hooking up 2 10" subs and a 450watt amp that my friend gave me. Now I'll admit, I'm a bit of a noob when it comes to car audio, but I know what I'm doing. Here's my problem: I have power going to the amp, but no sound from the subs. Everything's hooked up, I've got the turn on lead going to the deck, and my friend said they worked fine for him. Any ideas what I'm doing wrong?