Electro-Voice SH-1512 User's Manual
Contents
1. woofer Box Tuning Frequency Normal 56 Hz Step Down 39 Hz Crossover Frequency 1 500 Hz Crossover Slope 12 dB per octave Impedance Nominal 8 ohms Minimum 6 3 ohms Electro Voice a MARK IV company FIGURE 1 Axial Frequency Response 4 volts 10 feet Model SH 1512 Two Way Stage Speaker System Input Connections Parallel v4 in phone jacks allows paralleling of multiple speakers Enclosure Materials and Colors Black carpet covered Road Wood Dimensions 78 7 cm 31 in high 53 4 cm 21 in wide 37 1 cm 14 6 in deep Net Weight 35 4 kg 78 Ibs Shipping Weight 38 1 kg 84 Ibs DESCRIPTION The Electro Voice SH 1512 is a 200 watt two way high efficiency constant dir ty stage system featuring a vented direct radiating woofer section I combines professiona quality components arranged in a vertical array with an unusually durable enclosure The result is cutting tull sound quality sometimes preferred in stage system sounc reinforcement situations The enclosure is constructed of Road Wood M a structural material made of layered and selectively oriented hardwood strands strongly bonded together with phenolic resins This high strength shell is covered with densely woven abuse resistant black carpeting The high frequency section of the SH 1512 utilizes a 90 x 40 constant directivity horn driven by a one inch throat wide bandwidth titanium diaphragm driver This drive2. 8234 Doe Avenue Visalia CA 93291 AC 209 651 7777 This warranty gives you specific legal rights and you may also have other rights which vary from state to state Service and repair address for this product Electro Voice inc 600 Cecil Street Buchanan Michigan 49107 Specifications subject to change without notice ELECTRO VOICE INC 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS AT ll BUCHANAN MI ll NEWPORT TN I SEVIERVILLE TN lil REDMOND WA lil GANANOQUE ONT lectro Voice Inc 1987 IB Litho In USA Part Number 530598 547 MARK IV company
3. until _the flange touches the bafile board insuring an airtight seal Because of the friction fit the port plug will remain in place during normal operation and transportation The plug may be removed by prying the flange outward and pulling WARRANTY Limited Electro Voice Speakers and Speaker Systems excluding active electronics are guaranteed for five years from date of original purchase against malfunction due to defects in workmanship and materials If such malfunc tion occurs unit will be repaired or replaced at our option without charge for materials or labor if delivered prepaid to the proper Electro Voice service facility Unit will be returned prepaid Warranty does not extend to finish appearance items burned coils or malfunction due to abuse or operation under other than specified conditions including cone and or coil damage resulting from improperly designed enclosures nor does it extend to incidental or consequential damages Some states do not allow the exclusion or limitation of incidental or consequential damages so the above exclusion may not apply to you Repair by other than Electro Voice or its authorized service agencies will void this guarantee A list of authorized warranty service agencies is available from Electro Voice Inc 600 Cecil Street Buchanan MI 49107 AC 616 695 6831 Electro Voice Inc 3810 148th Avenue N E Redmond WA 98052 AC 206 881 9555 and or Electro Voice West
4. zones at certain frequencies The 90 x 40 dispersion characteristic also helps avoid early reflections from nearby floor or side wall surfaces which could BEAMWIDTH IN DEGREES Se a degrade performance The controlled 5000 10000 20000 directivity of the high and low frequency transducers also eliminates response FREQUENCY IN HERTZ irregularities caused by diffraction off nearby HORIZONTAL O enclosure edges VERTICAL A FIGURE 4 Beamwidth vs Frequency SELECTABLE LOW FREQUENCY Whole Space anechoic RESPONSE The unique design of the SH 1512 provides a selection of two low frequency response curves by the optional use of a removable port plug In the normal configuration port plug out the low frequency output is maximized in the 50 to 100 Hz region In the step down configuration port plug in the output below 60 Hz is increased by 3096 NUMBERS INDICATE with the response leveling out in the octave SPECIFIC R VALUES above This means that the system can be tailored to match the low frequency requirements of the program material Experimentation is recommended for particular applications D dB ENCLOSURE CONSTRUCTION The SH 1512 enclosure utilizes a structural material that combines the strength of high quality plywood with the density and acoustic damping of particle board without brittleness DIRECTIVITY FACTOR DIRECTIVITY INDEX Road Wood uses the same principle of FREQUENCY IN HERTZ crossbanding veneer
5. SPECIFICATIONS Frequency Response 10 Feet on Axis Swept s Octave Half Space Anechoic Environment see Figure 1 50 20 000 Hz Low Frequency 3 dB Down Point Normal 55 Hz Step Down 50 Hz Usable Low Frequency Limit 10 dB down point Normal 49 Hz Step Down 44 Hz Half Space Reference Efficiency 1 8 Long Term Average Power Handling Capacity per EIA Standard RS 426A see Power Handling Capacity section 200 watts Maximum Woofer Acoustic Output 3 6 watts Sound Pressure Level at 1 Meter 1 Watt Input Anechoic Environment Band Limited Pink Noise Signal 300 2 000 Hz 99 dB Dispersion Angle Included by 6 dB Down Points on Polar Responses Indicated One Third Octave Bands of Pink Noise 250 20 000 Hz Horizontal see Figure 4 1109 509 5 000 20 000 Hz Vertical see Figure 4 469 t5 Directivity Factor Ra Q 800 16 000 Hz Median see Figure 5 10 5 3 5 4 0 Directivity Index D 800 16 000 Hz Median see Figure 4 10 0 dB 41 0 dB 2 0 dB Distortion 0 1 Full Power Input Second Harmonic 100 Hz 396 1 000 Hz 3 10 000 Hz 14 Third Harmonic 100 Hz 1 1 000 Hz 196 10 000 Hz 3 5 Distortion 0 01 Full Power Input Second Harmonic 100 Hz 196 1 000 Hz lt 1 10 000 Hz 4 5 Third Harmonic 100 Hz lt 1 1 000 Hz lt 1 10 000 Hz lt 1 Transducer Complement High Frequency One inch titanium diaphragm driver 90 x 40 constant directivity horn Low Frequency Special design 15
6. elected v3 octave bandwidths is shown in Figure 3 These polar responses were measured in an anechoic environment at 10 feet using octave pink noise inputs The frequencies selected are fully representative of the polar response of the system Beamwidth of the system utilizing the complete V5 octave polar data is shown in Figure 4 Rg Q and directivity index Dj are plotted in Figure 5 POWER HANDLING CAPACITY Te our knowledge Electro Voice was the first U S manufacturer to develop and publish a power test closely related to real life conditions First we use a random noise input signal because it contains many frequencies simultaneously just like real voice or instrument program Second our Signal contains more energy at extremely high and low frequencies than typical actual program adding an extra measure of reliability Third the test signal includes not only the overall long term average or continuous level which our ears interpret as loudness but also short duration peaks which are many times higher than the average just like actual program The long term average level stresses the speaker thermally heat The instantaneous peaks test mechanical reliability cone and diaphragm excursion Note that the sine wave test signals sometimes used have a much less demanding peak value relative to their average level In actual use long term average levels exist from several seconds on up but we apply the long
7. r uses unique convex drive Time PathTM phasing plug structure patent pending for smooth and extended high frequency performance LLL EL fate LN NI ASIN SPL in dB 5000 10000 20000 40000 NORMAL STEP DOWN FREQUENCY IN HERTZ FIGURE 2 Axial Frequency Response 4 volts 10 feet Half Space Anechoic Environment HORIZONTAL 5 dB per Division FIGURE 3 Polar Response octave pink noise 4 volts 10 feet M The bass section of the SH 1512 is designed using Thiele Small parameters for efficient performance to below 55 Hz with provisions for stepping down the tuning to extend performance to below 50 Hz The 15 inch woofer used is a specially designed unit featuring an extended length voice coil and high temperature construction materials CONSTANT DIRECTIVITY SPEAKER SYSTEM The crossover frequency and speaker component geometries have been selected so that the directional characteristics of the woofer and constant directivity horn match at the crossover frequency approximately 909 circular coverage patterns for each to create a special system type the constant directivity system At higher frequencies the horizontal coverage pattern remains constant and the vertical pattern smoothly transitions to a 40 to 50 angle above 5 000 Hz Response within the 90 x 40 rated coverage angle is uniform which means dependable audience coverage without hot spots or dead
8. s as in plywood in order to achieve its very high rigidity A FIGURE 5 Directivity vs Frequency tough liquid phenolic resin is blended with Whole Space anechoic long narrow strands of hardwood Alternate layers are perpendicularly bonded under intense heat and pressure to form panels of superior uniformity Unlike many grades of plywood Road Wood is dimensionally stable water resistant and free from voids A combination of dado cut joints tough adhesives and proper bracing ensure a sonically dead enclosure free from panel resonances The densely woven industrial grade abuse resistant carpeting provides a finish that is both attractive and highly durable Large heavy duty metal corner protectors firmly secured rubber feet recessed handles and a protective metal grille complete the picture and ensure that the SH 1512 speaker system is ideally suited to a long and reliable life on the road FREQUENCY RESPONSE The combination of a 15 inch woofer wide bandwidth high frequency driver and an equalized crossover results in the wide and smooth overall response shown in Figure 2 Curves are shown for both normal box tuning and optional step down This response was measured at 10 feet using a swept Va octave input of 4 volts no external equalization was used DIRECTIVITY A unique feature of the SH 1512 is the constant directivity dispersion provided by the 90 x 40 horn The polar response of the system at s
9. term average for several hours adding another extra measure of reliability Specifically the SH 1512 is designed to withstand the power test described in the revised EIA Standard RS 426A The EIA test spectrum is applied for eight hours To obtain the spectrum the output of a white noise generator white noise is a particular type of random noise with equal energy per bandwidth in Hz is fed to a shaping filter with 6 dB per octave slopes below 40 Hz and above 318 Hz When measured with the usual constant percentage bandwidth analyzer one third octave this shaping filter produces a spectrum whose 3 dB down points are at 100 Hz and 1 200 Hz with a 3 dB per octave slope above 1 200 Hz This shaped signal is sent to the power amplifier with the continuous power set at 200 watts into the 6 0 ohms EIA equivalent impedance 34 6 volts true RMS Amplifier clipping sets instantaneous peaks at 6 dB above the continous power or 800 watt peak 69 2 volts peak This procedure provides a rigorous test of both thermal and mechanical failure modes PORT PLUG INSTALLATION The step down tuning for extended low frequency response can be achieved by the installation of the port plug supplied with the SH 1512 First the grille must be removed by removing the six grille mounting screws The port plug is then inserted into either one of the port holes with the port plug flange remaining on the outside of the cabinet The plug should be pressed in
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