User manual ELECTRO-VOICE DO56 DATASHEET

[. . . ] The 80-degree horizontal by 60-degree vertical dispersion pattern is beneficial in many applications requiring a wide coverage pattern. Furthermore, excellent loading is maintained to a low-frequency cutoff of 250 Hz. The Cobreflex IIB is constructed from a high-impact acrylonitrile butadiene styrene (ABS) with an ultraviolet inhibiting grey paint finish. [. . . ] A serrated positive-lock "U" mounting bracket is provided for maximum mounting flexibility and ease of installation. Architects' and Engineers' Specifications The horn shall be of the reflex type featuring two separate air columns within the single assembly. It shall produce a horizontal beamwidth of 80-degrees and a vertical beamwidth of 60-degrees at 2 kHz. In addition, it shall provide useful acoustic loading at all frequencies above 250 Hz. The horn shall be constructed from a high impact acrylonitrile butadiene styrene (ABS) and finished with an ultraviolet inhibiting grey paint. A serrated, positive-lock "U" mounting bracket shall be affixed to the bell by self-locking nuts and shall provide orientation adjustment in all three planes. The horn shall possess a throat of 1. 91 cm (0. 75 in. ) diameter and shall be provided with a 1 3/8"-18 thread for the mounting of a compression driver. The horn shall be 23. 5 cm (9. 3 in. ) high, 47. 0 cm (18. 5 in. ) wide and 26. 0 cm (10. 3 in. ) deep. It shall weigh no more than 2. 3 kg (5. 1 lb). 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 Cobreflex IIB's 6-dB-down total included beamwidth angle is shown in Figure 2 for each one-third-octave center frequency. Directivity The axial directivity factor R (formerly Q) of the Cobreflex IIB horn was computed at each one-third-octave center frequency from the horizontal/vertical polars and is displayed in Figure 3. Figure 2. Cobreflex IIB Polar Response Figure 3. Cobreflex IIB Directivity Factor and Directivity Index vs. Frequency 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. FAX: 41/32-331-1221 Hirschberger Ring 45, D94315, Straubing, Germany, Phone: 49 9421-706 392, FAX: 49 9421-706 287 Parc de Courcerin, Alle Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: 33/1-6480-0090, FAX: 33/1-6480-4538 Unit 23, Block C, Slough Business Park, Slough Avenue, Silverwater, N. S. W. [. . . ] FAX: 41/32-331-1221 Hirschberger Ring 45, D94315, Straubing, Germany, Phone: 49 9421-706 392, FAX: 49 9421-706 287 Parc de Courcerin, Alle Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: 33/1-6480-0090, FAX: 33/1-6480-4538 Unit 23, Block C, Slough Business Park, Slough Avenue, Silverwater, N. S. W. 2128, Australia, Phone: 61/2-9648-3455, FAX: 61/2-9648-5585 Unit E & F, 21/F, Luk Hop Industrial Bldg. , 8 Luk Hop St. , San PO Kong, Kowloon, Hong Kong, Phone: 852-2351-3628, FAX: 852-2351-3329 2-5-60 Izumi, Suginami-ku, Tokyo, Japan 168, Phone: 81-3-3325-7900, FAX:81-3-3325-7789 3015A Ubi Rd 1, 05-10, Kampong Ubi Industrial Estate, Singapore 408705, Phone: 65-746-8760, FAX: 65-746-1206 Av. 53390, Phone: (52) 5358-5434, FAX: (52) 5358-5588 4, The Willows Centre, Willow Lane, Mitcham, Surrey CR4 4NX, UK, Phone: 44 181 640 9600, FAX: 44 181 646 7084 12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7424, FAX: 952-887-9212 12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7491, FAX: 952-887-9212 www. electrovoice. com · Telex Communications, Inc. [. . . ]