The Crown 180A, 280A, and 1160A are high-value amplifiers for commercial and industrial audio. They provide 4-ohm and constant-voltage outputs (70V and 100V). The amps are part of Crown's Commercial Audio Series, which also includes mixers and mixeramps. These low-cost units provide all necessary features in a simple building-block format. Some applications include schools, hospitals,factories, restaurant/retail, houses of worship,fitness facilities, A/V boardrooms, prisons, andsmall offi ces. Typical uses are paging, backgroundmusic, security and evacuation instructions.The sound system can be upgraded as a facilityexpands. For example, you can add more mixersfor more inputs, or add more power amps (ormixer-amps) to handle more zones.