User manual Electro-Voice Constant-Directivity Horn HP1240

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0.281 x 4  
Figure 1: Dimensions  
The axial directivity factor Rθ(formerly Q) of the HP1240 horn  
was computed at each one-third-octave center frequency from  
the horizontal/vertical polars. The graph in Figure 2 illustrates  
this data over the range 500 Hz to 20 kHz. The axial frequency  
response of the HP1240 with a particular driver is in close  
correspondence to that drivers power response above 500  
A plot of the HP1240s 6-dB-down total included beamwidth  
angle is shown in Figure 3 for each one-third-octave center  
frequency. The horizontal beamwidth is maintained at 120°  
(+20°, -40°) over the range of 500 Hz to 20 kHz. Vertical  
beamwidth control occurs only above 1.5 kHz because of  
the relatively short vertical dimension of the horns mouth.  
Figure 2: Directivity vesus Frequency  
Figure 3: 6-dB-Down Beamwidth versus Frequency  
12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-884-4051, FAX: 952-884-0043  
Hong Kong  
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. Parque Chapultepec #66-201, Col. EI. Parque Edo. Mex. 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  
U.S.A. and Canada only.  
For customer orders, contact the Customer Service department at  
00/392-3497 Fax: 800/955-6831  
For warranty repair or service information, contact the Service  
Repair department at 800/685-2606  
Africa, Mid-East 12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7424, FAX: 952-887-9212  
Latin America 12000 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7491, FAX: 952-887-9212  
For technical assistance, contact Technical Support at 866/78AUDIO  
Please refer to the Engineering Data Sheet for warranty information.  
Specifications subject to change without notice. • Telex Communications, Inc. •  
© Telex Communications, Inc. 02/2001  
Part Number 38109-951 Rev A  

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