Music festivals are prone to getting sound complaints of the nearby residents. EDM in particular, due to the extra loud drops and electric noises. Its quite an art to make your sound loud enough to reach the large audience, but not let the sound travel to those who perhaps do not want to hear it.
PK Sound Technology recently perfected this art through their speakers and equipment that the events production, the talent, and the audience could agree on. Now PK is being used at EDC in both Las Vegas and in Mexico City, and at the DoLab at Coachella.