I built a small audio amplifier using a OPA2134PA as a pre-amp to drive a complementary pair of Mosfets (IRF9540NPBF and IRF540NPBF). I've biased my Mosfets using two 10k resistors and 6 diodes. I've also fed some of my combined Mosfet output back into the inverting input of the OpAmp. The output looks great all across the audible range of 20Hz to 20,000Hz until I place a low impedance (8-10 Ohm) load on it.
My question is: Is the return of crossover distortion expected when a load is applied and is there a way to mitigate it?
Yellow: Input signal from generator
Blue : Combined output signal from Mosfets.
Pretty accurate representation of my output stage: