The first round is no elimination, each sound plays a set time. Second round each sound system plays but one sound system being eliminated by poor performance, poor quality or by playing back a song. Elimination continues until two sounds are left, for example Bredda Hype sound vs Sound Trooper. The time interval gets shorter and shorter, with the introduction of television clashes, so when playing returns to one sound again, they may only play a shorter time, 15 minutes. Near the end of the clash they go song on song or "Dub fi dub."