Crossover Distortion
Is there an optimum idle current where distortion in minimised ?


A lot of folk will always swear by class A power amplifiers because there is no discernible cross over-distortion: -



So, how much do you want to bias the transistors from being "class B" to "class AB" to "class A" is pretty much down to how little distortion you can tolerate.

Feedback helps a lot because if you have a really fast op-amp driving the final transistor stages, the cross-over distortion is much-reduced by the op-amp actively pushing through this area but, then you get the audiophiles insisting that feedback is bad hence, they go for straight class A with very little feedback and lots of heat generated.