Mass notification wide area sound signals up to 1.5km / 0.9 mile radius
Model CA-4 Air Alarm
This compact design is suitable for a wide range of fire alarm and general sound signal requirements where omni-directional performance is needed. The Kahlenberg Model CA-4 has a wide area warning radius of 1.5km (3km diameter) and is built of rugged bronze castings with a stainless steel diaphragm. SPL is 133 ± 1dBA @ 1m with fundamental frequency 745 Hz ± 20 Hz.