I understand now. You can do something like that if you want. It won’t hurt it if you just want to make it 16″ either. A few minor things will change (mainly diffraction and baffle step), but nothing that your room eq won’t take care of. Baffle step would only change by around 40hz and that would be a very minimal change in that region (maybe 1db).So that will be up to you. BUt I think if you did a nice 1″ chamfer it would look really nice.