If you want your car amplifier to produce a louder sound, you can reduce the ohm load or bridge the channels on a car amplifier. One way to gain more power is to lower the ohm load is on a car amplifier, which means there is less resistance between the speaker and the amp, therefore a increase in rms output power. Some car amplifier are not designed to handle a lower ohm load below 4 ohms stable, so just to be on the safe side check the user manual for further guidance.
You can also gain more rms power, if you bridge the car amplifier. Bridging a car amplifier increase the total output power because it takes the rms power from both channels and combines it into one channel. For example on a car amplifier, there are 2 channel that are 50 watts rms each, if you bridge the both output channels together you gain a 100 watts. Always check in your user manual to make sure if your car amplifier is compatible with bridging.
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