Need help with three-stage transistor amplifier in LTSpice
Each of your two gain stages are in saturation.

Increase the emitter resistors to 16 thousand ohms.

To produce 2 watts across 32 ohms, use Prms= Vrms/Zload. 

Reduce your +- power from 200 volts to 20 volts.

Regarding that 10,000Hz (3dB point? 0.707 down??), what is the Miller Effect input capacity of stage1? of stage2? of stage3? That Cmiller, times the Rsource, sets the stage timeconstant and thus sets the 3dB frequency.

Regarding the output stage, I'd replace each of R13 and R14 with 2 series diodes.

And put 10 ohm resistors in emitter of Q4 and Q6.