Professional Public Address / Installation Amplifier The Coliseum CA1 public address amplifier has been designed specifically for installations where a versatile paging system with high quality music playback is required. Ideal for restaurants, small clubs, offices and retail environments where a simple and reliable system capable of servicing multiple paging zones is required. Multiple inputs for microphone or source material, and voice activated paging from either a microphone or telephone matrix means the CA1 can be used in virtually any application.