User manual ELECTRO-VOICE 307 DATASHEET

[. . . ] Furthermore, excellent loading is maintained to a low frequency of 500 Hz. The flat-front design makes the 307 suitable for all modern boxed and clustered systems. [. . . ] A special vaned waveguide throat detail gives the 307 unusually uniform vertical directivity control in the top octaves when compared to similar 2-inch-throat horn designs. Constant-Directivity Horn Architects' and Engineers' Specifications The horn shall be of the constant-directivity type. It shall produce a horizontal beamwidth (6-dB-down angle) of 90 degrees, deviating no more than 20 degrees from this angle over the frequency range of 500 to 20, 000 Hz. It shall produce a vertical beamwidth of 40 degrees, deviating no more than 20 degrees from this angle over the frequency range of 1, 200 to 20, 000 Hz. In addition, it shall provide useful acoustic loading at all frequencies above 500 Hz. The horn shall be of hybrid fiberglass-and-zinc construction. The horizontal beamwidth is maintained at 90° (+20°, -10°) over the range 500 Hz to 20 kHz. Vertical beamwidth control occurs only above 1. 2 kHz because of the relatively short vertical dimension of the horn's mouth. Figure 2: Directivity vesus Frequency Figure 3: 6-dB-Down Beamwidth versus Frequency USA Canada Germany France Australia Hong Kong Japan Singapore Mexico UK Africa, Mid-East Latin America www. electrovoice. com Telex Communications, Inc. www. telex. com © Telex Communications, Inc. 02/2001 Part Number 38109-963 Rev A 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 Hirschberger Ring 45, D94315, Straubing, Germany, Phone: 49 9421-706 0, 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 5-3-8 Funabashi, Setagaya-ku, Tokyo, 156-0055 Japan, Phone: +81 (0) 3-5316-5020, FAX: +81 (0) 3-5316-5031 3015A Ubi Rd 1, 05-10, Kampong Ubi Industrial Estate, Singapore 408705, Phone: 65-746-8760, FAX: 65-746-1206 Av. [. . . ] 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 5-3-8 Funabashi, Setagaya-ku, Tokyo, 156-0055 Japan, Phone: +81 (0) 3-5316-5020, FAX: +81 (0) 3-5316-5031 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 U. S. A. [. . . ]