Weatherproof 100V sound projectors offer music quality audio reproduction and intelligible speech in exposed environments where horn sound quality is not adequate. Widely used in rail platforms, visitor centres and other open public spaces, WSP25 sound projectors are able to withstand the elements whilst providing reliable operation. RM-series mixer-amps have a Bluetooth receiver, mp3, FM tuner and are specified in each package based on the maximum speaker Wattage tappings. It is recommended to tap down the power of some perimeter speakers so that the total combined speaker Watts is <90% the amplifier max output power. Using lower tappings on more speakers can allow additional speakers to be added to the line, again observing the <90% rule.