Electro-Voice HT94 User's Manual
Contents
1. 8 8883883 R FREQUENCY IN HERTZ FIGURE 6 Impedance Response DH2305 on HT94 Horn IMPEDANCE IN OHMS LEVEL IN dB TA TARY AD SHNI HARMONIC SOs g 8E8883 3 FREQUENCY IN HERT 58 FIGURE 5 Distortion Response DH1506 Driver on HT94 Horn 2 Watts 1 Meter 8 8 FREQUENCY IN HERTZ AR FIGURE 7 Impedance Response DH1506 on HT94 Horn LN Igat 0 NAIA P MEN MAN INGE Sn 229 FIGURE 8 HT94 Polar Response Octave Pink Noise 4 Volts 10 Feet WARRANTY Limited For shipping address and instructions on Electro Voice also maintains complete Electro Voice Professional Sound Reinforce return of Electro Voice products for repair facilites for non warranty service ment Loudspeakers and Accessories are and locations of authorized service agencies Quaranteed for five years from date of please write Service Department Service and repair address for this product original purchase against malfunction due to Electro Voice Inc 600 Cecil Street Electro Voice 600 Cecil Street defects in workmanship and materials If Buchanan Michigan 49107 P O Box 186 Buchanan Michigan 49107 such malfunction occurs unit will be repaired Phone 616 695 6831 or replaced at our option without charge for or Electro Voice West 8234 Doe Ave2. BEAMWIDTH A plot of the HT94 s 6 dB down total includ ed beamwidth angle is shown in Figure 3 for each one third octave center frequency The horizontal beamwidth is maintained at 90 109 159 over the range 3 kHz to 16 kHz Vertical beamwidth contro occurs only above 3 kHz because of the relatively short vertical dimension of the horn s mouth POLAR RESPONSE The directional characteristics of the HT94 with driver attached were measured by running a set of horizontal vertical polar responses in EV s large anechoic chamber at each one third octave center frequency The test signal was one third octave band width limited pseudo random pink noise 1 0 Hz repetition rate centered at the indicated frequencies The measurement microphone was placed 6 1 m 20 ft from the horn mouth while rotation was about the horn rear driver flange The horn was suspended freely with no baffle The polars shown in Figure 8 display the results of these tests The center frequency and beamwidth angle are noted on each polar The top angle at the center on each chart is the horizontal beamwidth and the bottom angle is the vertical beamwidth alice IMPEDANCE IN OHMS Tt LEVEL IN dB i ee eens FREQUENCY IN HERTZ FIGURE 4 Distortion Response DH2305 Driver on HT94 Horn 2 Watts 1 Meter
3. Specifications subject to change materials or labor if delivered prepaid to the P O Box 3297 Visalia California 93277 without notice proper Electro Voice service facility Unit will Phone 209 625 1330 1 be returned prepaid Warranty does not cover finish or appearance items or malfunc tion due to abuse or operation at other than specified conditions Repair by other than Electro Voice or its authorized service agen cies will void this guarantee ELECTRO VOICE INC 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS BUCHANAN 8 NEWPORT TN SEVIERVILLE TN 8 REDMOND WA 8 GANANOQUE ONT Guiton industnes inc 1984 Litho in USA pies Part Number 530451 433 Ey
4. Th SPECIFICATIONS The following specifications are in accor dance with or exceed the AES Draft Recommended Practice for Specification of Loudspeaker Components used in Profes sional Sound Reintorcement Systems 1983 Horizontal Beamwidth 90 10 159 6 dB average 3 kHz to 16 kHz Vertical Beamwidth 40 17 09 6 dB average 3 kHz to 16 kHz Directivity Factor R Q 12 9 3 4 3 4 average 3 kHz to 16 kHz Directivity Index 11 0 dB 1 1 1 2 dB 10 log Ry average 3 kHz to 16 kHz Usable Lower Frequency Limit 1500 Hz Recommended Minimum dB Crossover Frequency for Constant Directivity 3000 Hz Construction Diecast aluminum Mechanical Connection Screw on a standard 1 34 18 thread allows the attachment of the DH2305 driver and any other standard screw thread driver Recommended Drivers DH2305 DH1506 Dimensions 24 1 cm 9 5 in 19 5 7 7 14 7 5 8 Weight 0 5 kg 1 1 Ib Shipping Weight 0 7 kg 1 5 10 and 0 vs Frequency one third octave bandwidths Freq Hz Re D dB Freq Hz Ry 0 88 Electro Voice a gultan company Model 1194 Constant Directivity Horn DESCRIPTION The Electro Voice HT94 is a rigid die cast wide angle high frequency horn that provides precise pattern contro over the ftequency range from kHz to 16 kHz The results of the latest research into theoretical hor
5. n behavior by Electro Voice engineers is incor porated in its design 115 size and the expansion of its walls are op timized to load the driver DH2305 or other screw thread mount unit smoothly to 1500 Hz such as normally expected from an ex ponential horn of similar size While providing excellent vertical and horizontal pattern con trol this horn does not exhibit a strongly reactive response in the cutoff region as would normally be expected from this class of horn design 18 0 cm 7 1 in DIRECTIVITY FACTOR BEAMWIDTH IN DEGREES 6 dB 22 6 cm 8 9 in 14 0 5 5 in 43 170 1 4 18THD 19 6 cm 7 7 in Pi 14 7 cm 5 8 in FIGURE 1 Dimensions 24 1 cm 9 5 in DIRECTIVITY INDEX D dB FREQUENCY IN HERTZ FIGURE 2 Directivity vs Frequency HT94 Whole Space Anechoic HORIZONTAL mm VERTICAL ggg E a FREQUENCY IN HERTZ FIGURE 3 _Beamwidth vs Frequency HT94 Whole Space Anechoic DIRECTIVITY The axial directivity factor R formerly Q of the HT94 horn was computed at each one third octave center frequency from the horizontal vertical polars which are displayed on the left The graph in Figure 2 illustrates this data over the range 1 5 kHz to 16 kHz Thie axial frequency response of the HT94 horn with a particular driver is in close cor respondence to that driver s power response above 1 kHz
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