If you have just recently installed your car subwoofer into your car and the car amp has power but there is no sound, don't panic our car audio website is hear to help. We are car audio professionals and install car audio systems on a daily basis. The first thing you need to do is verify that the car amplifier is powered on. Nearly all car amplifiers will have an power LED that will light up, usually it is green which indicates there is power going to the car amplifier. If the power light is not green, the the car amplifier is not getting power.
You need to ensure that the red power wire is connected correctly and firmly to the positive + terminal found on the car battery. Make sure both the fuse on the car amplifier and the other found inside the inline fuse holder on the power wire is not blown. You also need to make sure the car amplifier ground, the black or brown wire from the car amp, is grounded to an surface that is bear metal. Sanding down the area were you have mounted the ring terminal from the car amplifier will ensure an good electrical connection. Sometimes paint can cause connection issues, which is common. This can sometimes cause your car amplifier to go into protect mode because it defects and issue with the circuit.
If you have checked the power and ground wires, then also check the blue remote wire if your car amplifier is not powering on. This is usually labelled as turn on or remote on the car amp and sits close to the power terminals on the car amp. An blue wire is fed into this and connected an in ignition source to the fuse box. If there is no connection from an correct source, either from an fuse box or the blue remote wire on the back of an aftermarket single or double din radio, the amplifier will fail to operate.
If you are 100% certain the car amplifier is getting the power it needs, but there is no sound, then the first thing you should do is check the RCA leads found on the car amplifier. When you move them, does the sound come back? If, so then your RCA leads are faulty. You also need to make sure your RCA cables are connected for the correct set of channel you are using that the car subwoofer is connected to. Make sure the RCA cable is connected to 'Audio output' on the back of the headunit and not an aux in sockets, as this is an easy mistake to be made as they are also red and white. The other end should connect into the 'INPUT' rca sockets on the car amp. All the RCA cable does is feed signal to the car amplifier, if there is no music input signal there is no sound.
Speaker wire can become undone inside the subwoofer enclosure, it may have come loose within the speaker terminal cup mounted onto the box, it could also have de attached from the terminal's found on the subwoofer. This can happen from bass vibrations overtime, or an slight knock when moving the speaker box in and out of your garage to the vehicle. Remove your subwoofer from the wooden MDF box enclosure and verify the inside connections. If you have done everything and there is still no sound coming from your car audio system, then the car amplifier is faulty or the speakers your powering are blown. This can happen from overpowering them with more than rated rms power or provide an clipping or distorted signal to them for long periods of time.
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