Your location in relation to speakers (front and eventual delay towers) is extremely important.
Try to place yourself at the point of the equilateral triangle that points out from the speaker, you should in general get the best sound experience:
Usually that is also where you find the sound booth.
People tend to move closer, in particular if the crowd does not fill up that area. That is a great mistake (unless you get all the way up at hear actual stage and center/side fill sound.. that sometimes work well too).
Watch out for the delay towers
The delay towers are extra speakers located far away from the main speakers. The sound here is delayed by some milliseconds to compensate for the distance to the main speakers. Sometimes the engineers get that delay number right ;-) Mostly its off and you can hear weird deviations in the high end depending on where you stand. Also the wind plays a larger role here due to the greater distance from main speakers. +
If you can't get to the golden triangle point of the speakers, try the same spot for a set of delay speakers, otherwise try to avoid those.