What you want does not exist. Even stripped down bare bones avr's will have features you won't want.
What is wrong with features like bass managment, or room correction, or dynamic volume control (think Dolby volume or audyssey dynamic eq), or most other commonly used features on todays avrs? They really do improve sound under the right circumstances when configured and used properly.
I don't need snobs to tell me how to think, thank you!