User manual ELECTRO-VOICE DP40

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ELECTRO-VOICE DP40 : Download the complete user guide (413 Ko)

Manual abstract: user guide ELECTRO-VOICE DP40

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

[. . . ] The axial frequency response will extend from 280 to 8, 000 Hz and the horn shall exhibit a low frequency cutoff of 180 Hz. Sound pressure level will be 105 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 150° and a vertical beamwidth of 110° at 2 kHz. The horizontal coverage shall be constant over the frequency range of 3 kHz to 10 kHz. [. . . ] The loudspeaker shall be compression molded fiberglass capable of satisfactory mechanical performance in the temperature range from - 40°C to +40°C and not subject to sunlight embrittlement. Other major external speaker parts shall be diecast zinc finished in gray polyester paint to match the molded horn parts. All components shall be resistant to damage from weather, moisture and fungus. A swivel bracket capable of providing either vertical or horizontal installation and a variety of adjustments, is provided. The loudspeaker shall be 52. 0 cm (20. 5 in. ) high, 26. 5 cm (10. 5 in. ) wide and 51. 0 cm (20. 0 in. ) long. The loudspeaker shall be the 850T, which includes a 70-V transformer and weighs no more than 8. 4 kg (19. 0 lb). Specifications: Frequency Response: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280-8, 000 Hz ±5 dB (see Figure 3) Power Handling, 8 Hours, 6 dB Crest Factor: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 watts (500-5, 000 Hz pink noise) Transformer Taps and Impedances: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Table 1 Sound Pressure Level at 1 Meter, 1 Watt Input Averaged, Pink Noise Band-Limited from 500 to 5, 000 Hz: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . It was measured at a distance of 1 meter, using a swept sine wave. Transformer A transformer and power selector switch are installed in the rear housing. Power taps for the transformer are listed in Table 1. Polar Response The directional characteristics of the 850T, with driver attached, were measured by running a set of horizontal/vertical polar responses, in a 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 wave guide 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 (- - -). Low-Frequency Driver Protection When frequencies below the low-frequency cutoff for the horn assembly are fed to the driver, excessive current may be drawn by the driver. For protection of driver, amplifier, and transformer, capacitor(s) in series with driver, or transformer primary are recommended. [. . . ] The wider plot on each chart is the horizontal polar (-) and the narrower plot is the vertical polar (- - -). Low-Frequency Driver Protection When frequencies below the low-frequency cutoff for the horn assembly are fed to the driver, excessive current may be drawn by the driver. For protection of driver, amplifier, and transformer, capacitor(s) in series with driver, or transformer primary are recommended. Values for other frequencies can be determined by using the formula: C= [ C200 x 200 f ] C200 = Values shown in the following table f = New Frequency Beamwidth A plot of the 850T's 6 dB-down total included beamwidth angle is shown in Figure 2 for each one-third-octave center frequency. 70-Volt Lines Power Impedance Capacitance 60W 83 10 30W 166 5 15W 333 2 8W 625 1 TABLE 1 - Series Protection Capacitors for 200 Hz and Below Figure 2 850T Beamwidth vs. [. . . ]

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