Ovalising the shell ???... C'mon surely , you know better than this drivel, you actually mean ovalising a piece of heat treated steel/aluminum 3.5 mm thick , reinforced by four tubes brazed/welded/lugged into it and only 68 mm wide ??? C'mon are you really an engineer ? an electronics engineer ?? an audio engineer ??? what ?, I merely ask this in interest ,because it seems apparent that you know very little in this field ?? But yet you must give your uneducated ?opininion !.. so I give you this opportunity to enlighten us all with your profession , as you seem very confident in the area of the chosen subject, as stated in the heading of this thread !! please feel free.... go right ahead .... take the stand Mr. Alex, Oh and speak into the microphone ! ... thank you.