When designing PA systems, especially those for fire/evacuation announcement systems, SPL at a given distance can be a critical measurement. This handy calculator allows you to determine the dB level at a given distance by inputting SPL rating 1W/1m, listening distance (such as distance to bedhead) and power tap selection. This can be used with any Redback 100V line speaker.
This calculator is provided as a guide only. Redback/Altronics takes no responsibility for its use in critical sound level applications. We recommend obtaining third party confirmation for any critical specification in a system design.