This is the 1958 RTCA 906-B DB output: 130db at 125feet The 906-B is SUPER rare because it was one of RTCA first experimental internal blower experiments for there sirens Plus, there were only 25 made There were 2 different version which are also more rare the first 1 has dampers and is able to run on 125v but still able to produce 135db and the second one also having dampers and being able to be controlled remotely
