Firsly, Superbouncing is something to do with the 'Havok' engine that created halo. As to the location of the bounce im not sure, although to find a superbouncing spot, press start, press Y and Y again, and you will see triangles of the floor of the map briefly, and you can land on the corner of those triangles. There is no exact 'Crouch point' aslong as you crouch somewhere you can do the superbounce.
Also superbouncing has something to do with the Frame Rate of your television, i.e Pal 60 which runs on 60 ghz and NTSC which runs at 59. something.
Depending on the frame rate you can do different superbounces most common superbouncing is in Pal 60 and NTSC but it is possible to superbounce in Pal 50 aswell, you just cant do the same bounces.
Hope this helps your knowledge of Superbouncing :)