I have a 09 Ford Ranger club cab with factory radio. I just removed a Sound ordinance 8" bandpass sub that was pushing maybe 90 watts rms. I replaced it with a Fli 12" FU12A with 300 watts rms. I am running a capacitor and have checked, and had friends check my wiring several times. I dont understand why this combo sounds no diffrent than the Sound Ordinance 8" I am using a factory head unit with a line converter because I dont have rca plugs. The gain on the converter is all the way up and the gain on the amp is all the way up. I had a friend check it out and he said its my head unit I need aftermarket with rca plugs. I know there is break in period but this seems a bit much. Any ideas what it could be?