I am working on Project to build a Bluetooth speaker. I am using only tip31c transistors and 4.7k and 1k ohm resistors along with 1uF capacitors. My simulation works for stage 1 but stage 2 &3 keeps going into saturation. Could someone please help me and explain my error.

 

The amplifier has gain so your 2V input is amplified by the first stage to some larger voltage. The second stage tries to amplify that larger voltage again but it only has 12V from the power supply so it cannot exceed that. Try reducing the input voltage until the output is not clipped.

 

Could someone please help me and explain my error.

What is the gain of the first stage at 1kHz?