Box with double bevel edges Im trying to model the box of the amp shown. I bevel the edges of the box



When I try to cut the hole, I bevel again the edges to get the round curve marked as "painfull zone". And no way to get a decent result.

When I smooth the box, geometry gets ugly. Tried applying some faces flat, but never get the correct result.

Here is my mesh:



Can somebody point me the right way to get the correct result?

Thank you so much in advance.
Try to keep your topology as quads. Using Ngons is only going to give you trouble when you want to subdivide.

Start with a cube.

Inset the top face.

Extrude the center face and bring it down on the Z axis to get the basic shape of the box.



Select the outer loop edge (press and hold Alt and Right Click with the mouse) and bevel it (CtrlB)

Do the same with the inner edge loop.



Then select the inner edges and bevel them as well.