The RMS power will increase but the peak will not and that is the problem. Think of an amplifier as a multiplier, because basically that is what it is. The scale of the multiplier is fixed. For example say the multiplier is 10 (it is not important to know what the factor is for your amp this is just a suppose). The input signal is 1 volt the output is 10 volts. Input is 2 output 20 and so on. There is a limit to this though. That limit is the rail voltage of the power supply. All the output devices do is modulate the voltage of the power supply. They cannot increase the the voltage beyond what they are given to work with. Say the power supply gives a 20V rail. That would mean that the top of the sinewave could be no higher than 20V. Assuming the multiplier of 10 again, the amp would be good up until an input of 2V. Beyond that input level the amp would no be able to reproduce the input signal accurately. Up to the 2V point it would be fine but beyond that it would just produce a 20V DC on the output until the input droped below 2V on the back side of the sine wave. The result is called clipping because if you look at the output wave form on an oscilloscope it looks like the nice pretty sine wave has had the top "clipped" off at the max rail voltage.which puts out approximately 30% more power than a sine wave which heats up the voice coil and could cause damage.
I've been into this for about 13 years. I went to college to be a EE because I was very interested in it. That didn't work out (I wasn't too excited about the math aspect of the application of EE theory but I know the theory from personal reading. Hell, I used to read encyclopedias for fun, amplifier design books are much more interesting than those.). I retain knowlege very well and have excellent recall.Helo, I'm curious how in the hell you know so much about car audio? I mean, right down to the physics of it.. what's your background?
They use MOSFETs rather than traditional transistors because switching speed is vital, but they can still be clipped. The amp will still try to multiply the signal by its factor and if that exceeds the max voltage then it just produces a pulse that is at its maximum voltage. Same limitations as any other.Do D class amps have the same switching as standard transistors ? If not then do you have to worry about clipping on them as well ?