on 200 ohm load with 70mA bias Fourier analysis for v(out): No. Harmonics: 10, THD: 0.0402076 %, Gridsize: 200, Interpolation Degree: 1 Harmonic Frequency Magnitude Phase Norm. Mag Norm. Phase -------- --------- --------- ----- --------- ----------- 0 0.000000e+00 -2.15765e-01 0.000000e+00 0.000000e+00 0.000000e+00 1 1.000000e+04 1.065667e+01 -2.23091e-01 1.000000e+00 0.000000e+00 2 2.000000e+04 2.648180e-03 1.002893e+02 2.484997e-04 1.005124e+02 3 3.000000e+04 3.363799e-03 2.139252e+01 3.156518e-04 2.161562e+01 4 4.000000e+04 9.505072e-05 -5.31800e+01 8.919361e-06 -5.29569e+01 5 5.000000e+04 1.483406e-04 -1.20027e+02 1.391998e-05 -1.19804e+02 6 6.000000e+04 9.038702e-06 1.606560e+02 8.481729e-07 1.608791e+02 7 7.000000e+04 1.723391e-05 7.881297e+01 1.617194e-06 7.903606e+01 8 8.000000e+04 1.866338e-06 -3.13638e+01 1.751332e-07 -3.11407e+01 9 9.000000e+04 2.287575e-06 -1.01812e+02 2.146613e-07 -1.01589e+02 on 22ohm load with 70mA bias the output stage go in class AB operation Fourier analysis for v(out): No. Harmonics: 10, THD: 0.295698 %, Gridsize: 200, Interpolation Degree: 1 Harmonic Frequency Magnitude Phase Norm. Mag Norm. Phase -------- --------- --------- ----- --------- ----------- 0 0.000000e+00 -2.00760e-01 0.000000e+00 0.000000e+00 0.000000e+00 1 1.000000e+04 5.090969e+00 -2.22745e-01 1.000000e+00 0.000000e+00 2 2.000000e+04 4.032223e-03 -9.19993e+01 7.920344e-04 -9.17766e+01 3 3.000000e+04 1.428727e-02 -6.86804e-02 2.806394e-03 1.540646e-01 4 4.000000e+04 1.228811e-03 -9.04889e+01 2.413708e-04 -9.02662e+01 5 5.000000e+04 2.086553e-03 -1.14260e+00 4.098538e-04 -9.19858e-01 6 6.000000e+04 2.145174e-04 8.655970e+01 4.213686e-05 8.678244e+01 7 7.000000e+04 3.653638e-04 1.789355e+02 7.176705e-05 1.791583e+02 8 8.000000e+04 3.178136e-04 8.800366e+01 6.242693e-05 8.822640e+01 9 9.000000e+04 3.001016e-04 1.782272e+02 5.894785e-05 1.784499e+02