User manual ELECTRO-VOICE CO90

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Manual abstract: user guide ELECTRO-VOICE CO90

Detailed instructions for use are in the User's Guide.

[. . . ] The axial frequency response will extend from 600 to 6, 500 Hz and the horn shall exhibit a low frequency cutoff of 400 Hz. Sound pressure level will be 107 dB (1 W/1 M) with a 500 to 5, 000 Hz pink noise signal applied, and the horn will produce a horizontal beamwidth of 80° and a vertical beamwidth of 50° at 2. 0 kHz. The loudspeaker shall be capable of handling a 60 watt, 500 to 5, 000 Hz pink noise signal with a 6 dB crest factor for a period of eight hours. The horn shall be molded high-impact acrylonitrile butadiene styrene (ABS), capable of satisfactory mechanical performance in the temperature range from -40°C (-40°F) to 71°C (160°F) and not subject to sunlight embrittlement. [. . . ] The horn shall be molded high-impact acrylonitrile butadiene styrene (ABS), capable of satisfactory mechanical performance in the temperature range from -40°C (-40°F) to 71°C (160°F) and not subject to sunlight embrittlement. Other major external speaker parts shall be diecast zinc finished in mesa tan baked enamel to match the molded horn parts. The Model PA60M shall have external parts of stainless steel and will be white in color. All components shall be resistant to damage from weather, moisture, and fungus. A serrated, positive-lock swivel bracket shall provide orientation adjustment in all three planes. Vertical adjustments are made by loosening a single wingnut on the mounting base. Dimensions shall be 28. 0 cm (11. 0 in. ) high by 16. 5 cm (6. 5 in. ) wide by 21. 6 cm (8. 5 in. ) deep. The loudspeaker shall be the PA60/PA60M. Specifications: Frequency Response: . . . . . . . . . . 600-6, 500 Hz ±5 dB (see Figure 3) Power Handling, 8 Hours, 6 dB Crest Factor: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 watts (500-5, 000 Hz pink noise) Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mounting the Base The removable mounting base has three evenly-spaced holes on a 60. 3 mm (2. 38 in. ) diameter circle. This diameter is small enough to be conveniently mounted on the cover of a standard 4-inch square or octagon electrical outlet box. In addition, the base is slotted for mounting with 1/2-inch steel banding material. Banding tools and materials are available commercially and permit attachment to I-beams, pillars, or similar structural supports, where screwmounting is impractical. Finally, the base may also be attached to many structural supports with small C-clamps providing appropriate safety measures are observed. Polar Response The directional characteristics of the PA60 were measured by running a set of horizontal/vertical polar responses in Electro-Voice's large anechoic chamber, at each one-third-octave center frequency. The test signal was one-third-octave pseudo-random pink noise centered at the indicated frequencies. The measurement microphone was placed 6. 1 m (20 ft. ) from the horn mouth, while rotation was about the waveguide geometric apexes. These axes of rotation are quite close to the apparent (acoustic) apexes across the frequency range of measurement. Errors attributable to the slight differences between the geometric and acoustic apexes are reduced to an inconsequential level by the relatively long, 20-foot measuring distance. The wider plot on each chart is the horizontal polar (­) and the narrower plot is the vertical polar (­ ­ ­). Beamwidth A plot of the PA60's 6-dB-down total included beamwidth angle is shown in Figure 2 for each one-third-octave center frequency. Frequency Response Figure 3 shows the axial frequency response of the PA60. [. . . ] These axes of rotation are quite close to the apparent (acoustic) apexes across the frequency range of measurement. Errors attributable to the slight differences between the geometric and acoustic apexes are reduced to an inconsequential level by the relatively long, 20-foot measuring distance. The wider plot on each chart is the horizontal polar (­) and the narrower plot is the vertical polar (­ ­ ­). Beamwidth A plot of the PA60's 6-dB-down total included beamwidth angle is shown in Figure 2 for each one-third-octave center frequency. Frequency Response Figure 3 shows the axial frequency response of the PA60. It was measured at a distance of 1 meter, using a swept sine wave. Figure 2 PA60 Beamwidth vs. [. . . ]

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