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Check the speaker connections from the amp to the box and inside the box to the sub. Its possible these came loose from vibration. Also gently push in on the sub. It should move freely and feel spongy. If it drags or is stiff the sub may be bad. Use an Ohm meter and test the sub. There is an Ohm rating on the sub (usually 4) and it should be close to that. Also check the audio in. Maybe the amp/sub combo is fine but there is no sound going in. Use an MP3 player with a 3.5MM to 2M RCA cable as an input. Start with the volume all the way down and SLOWLY raise the MP3 volume. Please Rate!
there has to be sumthn hooked up wrong bc i have had same problem with my 12' subs but it was simply a matter of my rca jacks but sense you have checked them try rewiring the speakers if that does not work then your rca module may be burned out within the amp..iso then check the amp by taking the cover off and making sure nuthn is burned on the inside.or if any wires are loose or touching.
My recommendation is to get a line level converter. Go to a car audio shop or even best buy and specifically ask for a line level converter. It will have speaker wires in and RCAs out. Connect the speaker wires to the sub woofer speaker wires and then you will have the RCAs to run to your amp. I hope this helped.
Some older Pioneer radios require you to connect the Subwoofer RCA to the rear output on the back of the radio and then you have to turn on the subwoofer in the menu on the radio. What model Pioneer radio is it? Also, make sure that the RCA plugged into the amp is on the input side, not the output side.