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This siren is similar to Federal Signal's Thunderbolt series. Only a single unit remains in service in Milwaukee, WI. Screamers Electro-Mechanical 2, 5, 7.5, 10 8, 9, 9/12, 10/12 1968–1994 Omni Directional 102–115 dB at 100 ft. Series of small vertical sirens, comparable to Federal Signal Corporation's vertical sirens. Sentry 95
A Federal Signal Modulator siren in Bay Head, New Jersey.. Federal Signal Modulators (also known as Modulator Speaker Arrays) are electronic warning devices produced by Federal Signal Corporation that are used to alert the public about tornadoes, severe weather, earthquakes, fires, lahars, tsunamis, or any other disaster.
Digital Designs, or DD Audio is an American manufacturer of high-end consumer audio products. They produce home and mobile audio products, serving the sound quality and sound pressure categories of the mobile audio market. Nearly all of their products are handmade in the United States.
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Popular loudspeakers included the Altec Lansing Duplex 600-series coaxial loudspeaker, studio monitors from the 1940s to the 1980s, [9] and the Altec "Voice of the Theatre" line of loudspeakers widely used in movie theaters, concert halls, and also in rock concerts from the 1960s to the 1990s, such as custom designs used at Woodstock Festival.
The Soundstream Digital Tape Recorder (DTR) consisted of a modified Honeywell 5600E instrumentation transport and analog and digital circuitry designed and built by Soundstream. There were 2 series of DTR's built. the first series (SN 1–4) was produced from ~1977 to 1979 and the second series (SN 5- 13) produced ~1980 to 1981.