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Sounds like there is a problem with the amp. Try switching the inputs around for that output on the amp. If that does not help, Yes I would have to say that there is a problem with the amp output circuit.
Most unit have RCA outputs that go to an amp.. There are sometimes a mute wire in the harness that goes to the control section. You need to have the service manual to work on these as there are few standards of wiring. Any home integrated amp or receiver should be able to handle the signal once it comes out to supply to speakers. Car players are many times full of broken solder joints. I looked for a picture of the unit but it must be old enough to not have much support.
1. Do you have power to the unit. I assume yes.
2. Ensure the fader and balance is set to neutral to ensure you have output going to all the speakers.
3. Ensure the speakers are connected.
4. Ensure the speakers are not out of phase, if they are they will cancel each other out, and sound muted
5. Always test new model head units with a cd. not fm radio. Using fm radio on some head units will mute the sound if the station is not coming in clear enough.
6. Set your volume up a little, like on 15 or 20 (using the digital 40 level radios) (halfway in plain language)
7. Ensure the mute isnt on
8. If running through and amplifer, ensure the power, ground, remote, gain and phase are all correct.
9. Ensure rca input is going into the correct place on the amp
10. Ensure speaker output is actually connected to speakers.
hope this helps
When it says that it usually means there is a paper scrap in the sensor flag that is under the long gray roller. It is a black plastic tab toward the right side behind the white plastic guides that the paper comes out under. You need a flashlight to see it and you need to be careful not to break the tab.
If you have tried different amps and different subs with the same result, I'd definitely suspect that you are not getting enough of an output signal from the head unit. Checking the RCA's and perhaps using a different set of preamp outs would be a good idea.
One other possibility that you may not have considered is to check the phasing. I've run into speakers that had the markings reversed and running the subs out-of-phase on a 4-channel bridged would make a huge difference in the bass.
if your power light is on then check your preamps (sub out from head-unit).Maybe you need to turn on that output thru head unit's audio menu.Also when using dual voice coils if you wire them out of phase there will be no output
To me, it sounds like your "Output Devices" in the MAIN Amp have gone faulty. BUT check the OUTPUT directly at the Head Unit & then the Amp's terminals to make sure.. if ya dont have any signal comming out of the "Head Unit" than thats ya fault.. however if that has a good signal out,there, then it's gotta be ya Main Amp. Ya can check to se if there is output with a small speaker with wires on it, or my favorite an modified earphone, with the wires ends exposed so ya can "Touch" them to the Output terminals/Plugs etc, of whatever ya wanna test. NB: Only test at a low level output.