I did not change my opinion I do confirm an ugly clipping behavior of that opamp, and I'll never use that as an output stage for the headphones amp for that reason. Also, that opamp has a fragile-unprotected input stage and its manufacturer recommend adding zeners there to clamp input at 5V or so. Hence, I'll never use that as an input stage as well. The ugly clipping is the sign of a low phase-margin, and in fact, I wasn't able to get a stable work that opamp in the composite configuration. So, this opamp is only suitable in my particular device as a buffer after the notch-filter, I see no another role for that.