The output power is a function of your volume control setting AND the input power.
If your audio source is delivering a 1 volt peak to peak input, clipping may happen before you reach max volume. If the source only inputs a .5 volt peak to peak signal then the amp will clip at a much higher volume setting, or it might not reach the output stage clipping point at all.

Edit (the input peak to peak values are for examples only and represent nothing in regards to the actual amp)

How to reduce excessive Input signal voltage coming from input source , e.g. a mobile phone ?

 

I absolutely agree. It would be a very bad design if a preceding stage were to clip before the output stage.

That is nonsense. No amplifier is going to handle av100V input without clipping before the outut stage.

Bob

 

No amplifier is going to handle av100V input without clipping before the outut stage.

You are not understanding the point being made.
Of course the input stage will clip at some point but, as the signal amplitude is increased, the output stage should be the first stage to clip, otherwise you would be losing dynamic range, and not be able to achieve the maximum output power.

 

I agree that, if the input is within the allowed range, the earlier stages should not clip.

Bob