Problem with most rigs is they are not powerful enough for most venues. Djs come on & put the volume control to max regardless of what is coming out of the speakers. If they were to look at the desk every once in a while they might see some nice flashing ligts - green - amber & red - treat them as you would traffic lights & that is how the equipment should be run. If you try to "bounce" sound off a wall 30 yards away & your rig isn't big enough all you are doing is amplifying distortion - which equals very poor (but loud!!) sound quality which also equals damage to ears & you can't nip down to your local hi-fi shop to get them repaired.
Brilliant post.......DJ's should be told not to touch anything. One person should be in charge of the sound, but they need to know what they are doing, and have some common sense.......the sound system is the most important part of an event.....it's not taken seriously enough, and I've been called a miserable **** when I have complained at certain nights.......But I won't put up with it any more, and either don't go back or take some ear plugs......people think nothing of paying thousands for records, but won't spend anything on decent PA. Most speakers that I see are set too low down, usually at head height, right in your lugholes..... If you get home from a do, and your ears are ringing. Then the PA has been set up wrong, or you've been standing with your head in a speaker. Either way it's bloody dangerous....