Whether you realize it or not, every car with a stereo has an amplifier. The fact is that most of the factory amplifiers are made in the car's head unit so you don't even know they exist. At the end of the day, a stereo doesn't work without an amplifier.
In the most basic sense, an amplifier is a device that increases the signal strength. For car stereo, that means taking a weak audio signal and amplifying it so that it plays with your speakers. Naturally, the more powerful an amplifier, the better the sound it can produce - as long as your speakers handle it.
The other aspect to pay close attention to is the power of the best 4 Channel amp provides. You want to look at the RMS value, rather than what an amplifier’s maximum power rating is. Do your best to match the RMS value to the power handling of your speakers, to get the best sound out of them.
Why Do I Need a Car Amplifier? So what’s the point of purchasing an aftermarket amplifier if your car already has one, you might be asking. Well, simply put, factory amplifiers that are integrated into a head unit just aren’t very good. Most car owners didn’t make their purchasing decision based on whether or not the car’s factory stereo sounded great, which means automakers don’t necessarily have a strong reason to use high quality components.
For some vehicle owners, simply upgrading their car speakers may be enough to increase the sound quality inside their cabin. But if that’s still not enough, you’ll want to add an aftermarket amplifier to really make those new speakers shine. As we mentioned before, an aftermarket amplifier is basically a necessity if you plan on adding a best 2 channel amplifier with subwoofer outpu