User manual ELECTRO-VOICE T221M EDS

[. . . ] Designed for low-impedance systems, this compact horn has outstanding speech intelligibility and high efficiency. COMMERCIAL Architects' and Engineers' Specifications The loudspeaker shall be an integral driver and reentrant horn having a rugged phenolic diaphragm and a high-temperature-rated 1. 0 inch voice coil. The axial frequency response will extend from 700 to 10, 500 Hz and the horn shall exhibit a low frequency cutoff of 500 Hz. [. . . ] The loudspeaker shall be capable of handling a 12 watt, 1, 000 to 5, 000 Hz pink noise signal with a 6 dB crest factor for a period of eight hours. The horn shall be diecast zinc with inner horn components of high-impact ABS, fungus-proof, moisture-proof, and capable of satisfactory mechanical performance in extreme or inclement weather. The Model PA12F is specified. Specifications: Frequency Response: . . . . . . 700-10, 500 Hz ±5 dB (see Figure 3) Power Handling: 8 Hours, 6 dB Crest Factor: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 watts (500-5, 000 Hz pink noise) Impedance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nominal: 8 ohms Sound Pressure Level at 1 Meter, 1 Watt Input Averaged, Pink Noise Band-Limited from 1, 000 to 5, 000 Hz: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 dB Horizontal Beamwidth: . . . . . . . . . . . . . . . . . . 125° @ 2 kHz (see Figure 2) Vertical Beamwidth: . . . . . . . . . . . . . . . . . . . . . . Errors attributable to the slight differences between the geometric and acoustic apexes are reduced to an inconsequential level by the relatively long, 20foot measuring distance. 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 (---). Polar Response The directional characteristics of the PA12F were measured by running a set of horizontal/vertical polar responses, in Electro-Voice's large anechoic chamber, at each one-thirdoctave 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 Beamwidth A plot of the PA12F's 6 dB-down total included beamwidth angle is shown in Figure 2 for each one-third-octave center frequency. Frequency Response Figure 3 shows the axial frequency response of the PA12F. It was measured at a distance of 1 meter, using a swept sine wave. Figure 2 PA12F Beamwidth vs. [. . . ] It was measured at a distance of 1 meter, using a swept sine wave. Figure 2 PA12F Beamwidth vs. Frequency Figure 1 PA12F Polar Response 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. [. . . ]