Help! Subwoofer won't work

Originally Posted by RonRizz

this doesn't make sense to me. Obviously it is a signal input issue, if you input your phone and it played ok, that rules out voltage issues, as well as incorrect input settings at amplifier (possibly) and speaker out connections. the absolute only other thing it can be is that it is not getting a signal through the rcas. did you check the voltage to see if signal was present??

Next question.. was this hooked up and working, and just died, or a new install.

next question... Did you try a DIFFERENT set of rcas from HU to amp?

next question.. Is amplifier gain turned completely down

It sounds like you have done the majority of the troubleshooting necessary. Next step is to remove all pieces from car and do bench testing.

Originally Posted by bigaudiofanat

What are the settings on your amp like? Where is the gain knob at? What is your crossover at? Is your rca's on the head unit plugged into the sub output?

Originally Posted by DeliriousClam

Yeah RCA's are the first thing that come to my mind.