I can hear audio source when I far away from it

In the AudioSource settings I have min/max distance. When I my audio listener far away from max distance, I still can hear audio. How can I prevent it?

Adjust your max distance number. The red curve needs to be near the bottom of the scale.

Try making your min distance 2 and your max distance 150. If thats still too loud increase the max distance more

Firstly verify if the sound is 3D. If yes,then just drag and place the red curve at x=5 (shown as triangle ) at the bottom near the blue line at y=0 .43275-screen-shot-2015-03-25-at-25641-pm.png