While working on The Cabito I looked into some other opamp + discrete buffer designs, like Rod Elliott's Project 113 and the headphone amp in the Cambridge Audio 540A v2 (shown in the service manual). I thought I'd share the sim files in case they are of use to someone. Also the NE5532 model I have, not sure where it came from, it's old.
Cheers,
Cabirio
Cheers,
Cabirio