A small Sound Reinforcement System could be a simple Public Address (PA) system (or Tannoy), playing sounds around a building. This could include music in a shop, announcements at a train station, or The standard chain for a Sound Reinforcement System is as follows: Inputs > Mixing Console > Amplifier > Speakers Please note: outboard devices like equalizers and limiters may be either "inserted" through insert points affiliated with the outputs of the mixing console or "inline" with cabling that goes directly from the outputs of the mixing console to the inputs of the outboard device.