Building Death Explosion Circle

[LichKingIsMe]

Hi people. Here's my problem: When I made two arcane towers making their models the arcane observatory, when they die(meaning the term of their death animation) there's a big explosion circle which covers the whole arcane observatory. I want it to be smaller because I made my towers small in the scaling value of 0.14. Even resizing the model in the Warcraft 3 Model Editor, the circle was still the same size. Can anyone please help... It's really important...