User manual ELECTRO-VOICE DS30 DATASHEET

[. . . ] Sound pressure level will be 105 dB (1 W/1 M) with a 500-5, 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 die-cast zinc and finished in gray polyester paint to match the molded horn parts. [. . . ] All components shall be resistant to damage from weather, moisture and fungus. A steel 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 54. 6 cm (21. 5 in. ) long. The loudspeaker shall be the 848AT, which includes a 70V/25V transformer and weighs no more than 7. 0 kg (15. 5 lb). Specifications: Frequency Response: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260-10, 000 Hz ±5 dB (see Figure 3) Power Handling, 8 Hours, 6 dB Crest Factor: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 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 500-5, 000 Hz: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 dB Horizontal Beamwidth: 150° at 2 kHz (see Figure 2) Vertical Beamwidth: 110° at 2 kHz (see Figure 2) Directivity Factor R (Q): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. 4 @ 2 kHz Usable Low-Frequency Limit: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 those 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 (---). Transformer A transformer is installed in the driver housing. Power taps for the transformer are listed in Table 1. 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 the driver, amplifier and transformer, capacitor(s) in series with driver or transformer primary is recommended. Values for other frequencies can be determined by using the formula: C200 = Values shown in the following table C200 x 200 C= f f = New Frequency [ ] Table 1. Series Protection Capacitors for 200 Hz and Below . [. . . ] Values for other frequencies can be determined by using the formula: C200 = Values shown in the following table C200 x 200 C= f f = New Frequency [ ] Table 1. Series Protection Capacitors for 200 Hz and Below . Power 30 W 15 W 8W 4W 2W 1W 1/2 W 166 333 625 1250 70-Volt Lines Impedance Capacitance 5 mf 2 mf 1 mf 0. 5 mf 156 312 625 1250 70-Volt Lines Impedance Capacitance 5 mf 2 mf 1 mf . 5 mf Figure 2 848AT Beamwidth vs. Frequency Figure 1 848AT Polar Response Figure 3 848AT Frequency Response (1 watt at 1 meter) USA Canada Switzerland Germany France Australia Hong Kong Japan Singapore Mexico UK Africa, Mid-East Latin America 12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-884-4051, FAX: 952-884-0043 705 Progress Avenue, Unit 46, Scarborough, Ontario, Canada, M1H2X1, Phone: 416-431-4975, 800-881-1685, FAX: 416-431-4588 Keltenstrasse 11, CH-2563 IPSACH, Switzerland, Phone: 41/32-331-6833. [. . . ]