Audio The problem with sound when two sources of sound are near.

I have two characters with machine guns, they shoot at the same time and the sound of shooting turns into a mess.

When two machine guns shoot, the sound of a tractor is obtained. The sound source lies on each machine, separately. How to fix it?

 

Many things here:

1) You need better sounds and more variation in the actual gun sounds themselves.
2) Perhaps the enemies shouldn't full-auto the guns in almost perfect sync to each other?
3) Have slight differences in the sound from each machine gun so the exact same samples aren't playing back.