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****** Page 1 ****** o MARK IV company FIGUFE t Axial Fremsency Respon% 4.votWtO SH-1512 SPECIFICATIONS Frequency Response, 10 Feet on Axis, Swept %-Octave, HaifSpace Anechoic Environment (see Figure 1): 50-20.000 Hz Low-Frequency a-dB-Down Point, Normal: 55 Hz Step-Down: 50 Hz Usable Low-Frequency Limit (10-dB•down point), Normal: Step-Down: 44 Hz Half-Space Reference Efficiency: Long-Term Average Power Handling Capacity per ElA 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): 5,000-20,000 Hz Vertical (see Figure 4): 460±50 Directivity Factor R9 800-16,000 Hz Median (see Figure 5): 105 (+35, -40) Directivity Index Di, 800-16,000 Hz Median (see Figure 4): 10.0 dB (+1.0 dB. -20 dE) Distortion, 0.1 Full Power Input Second Harmonic, 100 Hz: 3% t tooo Hz: 10,000 Hz: Third Harmonic, 100 Hz: 1,000 Hz 10/0 10,000 Hz: 350/0 Distortion, 0.01 Full Power Input Second Harmonic, 100 Hz: 1,000 Hz: < 10/0 10,000 Hz: 480/0 Third Harmonic, 100 Hz: 1 ,oco Hz: < 10.000 Hz: Transducer Complement, High-Frequency: One-inch titanium diaphragm drjver 900 x400 constant-directivity horn Low-Frequency: Speceal desjgn 15" 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. Two-Way Stagg Speaker System Input Connections: Parallel VA in, phone Jacks (allows paralleling of multipee speakers) Enclosure Materials and Colors: Black carpet covered Dimensions: 7B 7 cm (31 high cm (21 in.) vade 37t cm (14.6 in.) deep Net Weight: 354 kg (78 lbs) Shipping Weight: 38t kg (84 lbs) DESCRIPTION The Electro-Votce SH-1512 •s a 2C0-watt, two-way. high-efficiency. constant-directivity stage system featunng a venteddirect-radtatiro woofer section. It combines professional quality components arranged in a vertical array With an unusually durabie encosure. The result IS cutting, "tuff' • sound quality somettmes preferred In stage system sounc reinforcement situations. The enclosure IS constructed of Rcad- WoodTM. a structural material made of layered and selectively ortented hardwood strands strongly bonded together With phenolic resins. Th's high•strength shell is covered With densely woven, abuse-resent black carpeting. The high-frequency section of the SH'1512 utilizes a 900 x 400 constant-drectw•ty horn driven by a onæncn throat. wtde.bandwic:h. titantum diaphragm dnver Tims dnvet uses a unique convex drive Time PathTM phas;rg plug structure (patent pending) tor smooth and extended high-frequency performance. ****** Page 2 ****** 100 90 80 70 100 200 20 30 so 500 1 ooo 2000 5000 10000 20000 40000 NORMAL FREOUENCY IN HERTZ STEP-DOWN 200 Hz 315 Hz 630 Hz FIGURE 2 — Axial Frequency Response, 4-volts/10 feet Half-Space Anechoic Environment HORIZONTAL Level Adjusted 3.150 Hz 1,250 Hz —— — 2.000 Hz VERTICAL Level Adjusted (5 dB per Division) FIGURE 3 Polar Response (%-octave pink noise, 4-volts/10 feet) 10.000 Hz 20.000 Hz ****** Page 3 ****** The bass section of the SH-1512 is designed using Thiele-Small parameters for efficient performance to below 55 Hz, With provtsions for stepping down the turung 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 900 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 400 to 500 angle above 5,000 Hz. ResponSe within the 900 x 400 rated coverage angle is uniform. which means dependable audience coverage without "hot spots" or dead zones at certain frequencies. The 900 x 400 dispersion characteristic also helps avoid early reflections from nearby floor or side wall surfaces which could degrade performance, The controlled directivity Of the high• and low-frequency transducers also eliminates response irregularities caused by diffraction off nearby enclosure edges. SELECTABLE LOW FREQUENCY 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 300/0 with the response leveling out in the octave above. This means that the system can be tailored to match the low frequency of the program material. Experimentation is recommended for particular applications. 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. Road-WoodlM uses the same principle of crossbandtng veneers, as jn plywood, In order to achieve its very high rigidity. A tough liquid•phenolic ren is blended with 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 JS dimensionally stable. water-resistant and free from voids. A combination of dado cut joints. tough adhesives and proper braccng ensure a sonically dead enclosure free from panel resonances. o a: 360 300 200 100 80 60 30 20 100 100 10 a: 100 200 500 1000 2000 FAECUENCY IN HERTZ 10000 20000 5000 HORIZONTAL O VERTICAL FIGURE 4 Beamwidth vs Frequency Whole Space (anechoic) NUMBERS INDICATE SPECIFIC R? VALUES + 20 z 200 2000 500 1000 FAEOUENCY IN HERTZ 20000 5000 10000 FIGURE 5 Directivity vs Frequency Whole Space (anechoic) ****** Page 4 ****** The densely-woven, industrial-grade. abuse- res;stant carpeting provides a finish that 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 combjnaton ot a 15-nch woofer, wide- bardwldth, high-frequency driver and an equalized crossover results in the wide and smccth overall response shown In Ftgure 2, Cuues are shown for both normal box tuning and optional ste$own. This response was measured at 10 feet, using a swept V3-octave input of 4-volts; nc external equalization was used DIRECTIVITY A unique feature of the SH-1512 is the constant-directivity dispersion provided by the goo x 400 horn. The polar response of the system at selected t/3-octave bandwidths is shown In Figure These polar responses were measured in an anechoic environment at feet using 1/3-octave Pink noise inputs. The frequencies selected are fully representative of the polar response of the system. Beamwidth of the system utiliztng the complete %octave polar data is shown in Figure 4, (Q) and directivity index (D,) are plotted in Figure 5. powen HANDLING CAPACITY Tc our knowledge, Electro-Votce was the first LIS. manufacturer to develop and publish a pcwer test closely related to real-life conditions, First, we use a random noise input signal because it contains many frequenctes simultaneously, just like real voce or Instrument program. Second. our segnal contans more energy at extremely high and low frequencies than typical actual program, adding an extra measure of rele$iiity. 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 enst from several seconds on up, but we apply the long-term average for several hours, adding another extra measure of reliability. Specifically, the SH-1512 is destgned to withstand the power test described in the revised ElA Standard FS-426A. The ElA 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 tilter with slopes below 40 Hz and above 318 Hz. When measured with the usual constant-percentage bandwath analyzer (one-third-octave), this shaptng filter produces a spectrum whose points are at 100 Hz and 1.200 Hz with a 3-dB-per-octave slope above 900 Hz. This shaped signal is sent to the power amplfier with the continuous power set at 200 watts tnto the 6.0 ohms ElA equivalent Impedance. (34.6 volts true RMS)/ Amplifier clipping sets instantaneous peaks at 6 dE above the continous power, or 800 watt peak (69.2 voits 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 removtng the SIX grille mounting screws. The port plug 's then inser:ed 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 until the flange touches the baffle board Insuring an airtight seal. Because of the friction fit the MARK IV company port plug reman 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 workmanshp and materials. If such malfunc- tion occurs, unit will be repaired or replaced (at our option) without charge for matertais or labor f deitvered 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 resuiting from improperly designed enclosures, nor does it extend to incidental or consequential damages. Some states do not allow the excuston or limitation of incidental or consequential damages, so the above exclusion may not apply to you. Repair by other than Electro-Vo•ce or its authorized service agencies void this guarantee. A list of authorized warranty service agencies is avadabie from Electro-Votce, Inc.. 600 Ceci Street, Buchanan, MI 49107 (AC/616-695-6831); Electro-Voice, Inc., 3810 148th Avenue N e Redmond. WA 98052 (AC/2C6-881-9555); and/or E!ectro-Voice West. 8234 Ooe Avenue. Visalia. CA 93291 (AC1209-651-7777). This warranty oves you specific legal rights, and you may also have other rights which vary from state to state. Service and repair address for this product: Etectt&Voice, Inc., 600 Cecil Street, Buchanan, Michigan 49107. Specifications subject to change without notice.








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