User manual ELECTRO-VOICE CO90

[. . . ] 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. [. . . ] Net weight shall not exceed 1. 8 kg (4. 1 lb). 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nominal: 8 ohms Sound Pressure Level at 1 Meter 1 Watt Input Averaged, Pink Noise Band-Limited from 800 to 5, 000 Hz: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 dB Horizontal Beamwidth: . . . . . . . . . . . . . . . . . . . . . 80° @ 2 kHz (see Figure 2) Vertical Beamwidth: . . . . . . . . . . . . . . . . . . . . . . . . . 50° @ 2 kHz (see Figure 2) Directivity Factor R (Q): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. 9 @ 2 kHz Usable Low-Frequency Limit: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 horn was suspended freely with no baffle. [. . . ] The polar plots shown in Figure 1 display the results of these tests. The center frequency is noted on each plot. 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. [. . . ]