DIY Headphone Hybrid Amplifier Schematic Simulation

To semplify last project I choose to exchange Current Generator by a simple Resistor.
Power dissipate is about 4W so this component, 60ohm, shoul be composed by 2x120ohm/5W resistors.

Semplified schematic

Distortion increase, third harmonic

Distiortion increase, Vin=1Vpk, Vout=5Vpk but the power on the Haedphone is 400mW near the maximun power admitted, 500mW.

At 3Vpk out:

3Vpk output