“Installation took about five days,” said Comeau. He and his two man crew could have completed installation even more quickly but there were tight spaces to access and some surfaces were slippery because oil and lubricants are used during the cutting, stamping, drawing, and other operations making physical installation slower.
The speakers are located 10 feet to 12 feet above the floor. To attach the 40 speakers, Comeau used Bogen Beam Clamps (BC1) to mount them to the I-beams. Spacing between the speakers ranges from 40 to 50 feet, according to Didow. In extreme high noise areas speakers must be installed 40 feet apart. In moderate to high-noise areas speakers can be located every 50 feet.
“There are five runs of six speakers and two runs of five speakers,” said Comeau. The runs follow the processing lines in the building. “We aimed all speakers 30 degrees down in the same direction so the sound flows from the main office to the back of the plant,” explained Comeau. The horn’s tilt and swivel base permits easy positioning. Each horn has a 100-degree sound dispersion angle to direct sound in each area.
To help hasten installation, Bogen designed its horn loudspeakers (SPT30A) with a rotary selector switch to set the particular power tap needed for each environment. “We used 3.7-watt taps for areas with 85 dB, 15-watt taps for areas with 85 to 95 dB, and 30- watt taps for locations with 95 to 104 dB,” said Comeau. After the physical installation, Comeau and his crew went through every area in the plant to ensure that understandable messages could be heard throughout by using a sound meter and tweaking speakers as needed.