If youre wire is good ang speaker the problen is inside the amplifier IC
Check your fuses. Check to see if any of the wires are loose. Could be a blown fuse or loose wire.
Possibly the following link might be of interest:
https://www.youtube.com/watch?v=xMbsieEj0UM
SOURCE: Subwoofer Ground Wire Problem
there is also the possiblity of a ground potential problem you could try running a wire from the ground point of the amp to the rear of the head unit, in this way both components have the same ground potential....second , I would take the ground loose a the point you have connected to the vehicles chassis , i then would prepare the surface by sanding a quarter <25 cent piece> area and using two washers and nylon insert lock nut, and a bolt to securely fasten your ground ,,,,also I would use a grounding wire equal too or 2x teh ga you are using for your power < battery > cable.....and lastly I would reduce the input sensitivity to your amplifier, because if u have them turned up < more sensitive> the amp will amplify abient electrical noise present in your vehicle... if this helps let me know , if it does not let me know...
SOURCE: Subwoofer rattling.
Make sure your sub is securely screwed to your box, boot build, whatever you have it sitting in. Remember subs are made to vibrate when working, check your screws are tight.
SOURCE: I have a lanzar max
In part yes it is a flexibility for wiring your speakers to match the impedance of your amp. For example if your subs are 2 ohm dvc by wiring them in parallel you can drop the impedance down to 1 ohm per speaker and if you connect two 1 ohm then you get 1/2 an ohm load. Or you can put them in series and increase the impedance to 8 ohms which I wouldn't suggest you do. Here is a link to wiring speakers:
http://www.crutchfield.com/S-cgSECUmngLm/learn/learningcenter/car/subwoofers_wiring.html
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