2d Sound Roll off

Hi guys,

I've got a problem with a Crushing Candy bar on my game. Basically I can add the sound to it by adding an audio source. My game is 2D and I would like to not hear the Crusher sound until I'm closer to the object in question.

I've added thumbnail of the roll off etc and as far as I'm concerned it should work fine. However, I can hear the sound looping as soon as I start the level. Any ideas?