A lil' ol' thread for do's and dont's advice for DJs running on sound systems.
1. Keep your levels out of the RED - occasionally they'll go there either through inattention or over enthusiasm, but you need to ensure that you dont see RED, or the sound bwoy WILL! Also the sound will distort.
2. Try to ensure that the levels of each of the tracks are the same. set your EQs flat and pay attention to the gains.
There are plenty more, but i'd like to hear some input from other DJs.