You possibly may consider to turn down your car amp if you are using a subwoofer that is rated to not handle the rms power. For example, if you have a 12 inch Fusion branded sub rated at 500 rms and you have a amp at 1000 rms, you will need to turn down the car amp. If you don't the voice coil inside the speaker will get damaged from too much power or over excursion beyond its designed capability. The end result of this will be a blown speaker that is more or less worthless. The best way to turn down a car amplifier is by using the gain. This is used to match the voltage output signal that comes through the RCA cables provided by the car stereo. All you need to turn down your car amp is with a screwdriver nothing else is required, which means you can turn it back up later on if you upgrade.
1) Play a music file on your car radio that has some strong bass. Rap music is a good choice for this something like Lil Wayne a Milli will do the job nicely. Place the volume half way, not too loud because your amp might be setup up too high.
2) Use the truck release leaver to pop the trunk lid.
3) Locate your car amplifier settings. Look either on the right and left side were the fuse or power, ground and speakers go into. There will be a small turn able dial that is called gain.
4) Get a flat screwdriver and adjust this to an half position. This will approximately half the power going to the connected overpowered subwoofer. If you notice that the cone is getting warm quickly at high volumes, you will need to turn down the car amp slightly lower to reduce the power more.
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