Unity 5 low audio volume

I have a background sound for my game, in unity4 the sound plays fine but when i switch my game in unity5, my background sound plays with very a low volume even if the setting for volume in the inspector is set to one… but other audio clips are playing normal except for my background sound, im not changing the volume setting in my script…

what do you think could be the reason? TIA :slight_smile:

In the Audio Source, set the Spatial Blend to 0 (2D).