Electro-Voice FM-1502ER User's Manual
Contents
1. SPECIFICATIONS Frequency Response 10 Feet on Axis Swept 1 s Octave Half Space Anechoic Environment see Figure 1 65 20 000 Hz Low Frequency 3 dB Down Point 65 Hz Usable Low Frequency Limit 10 dB down point 47 Hz Half Space Reference Efficiency 4 5 Long Term Average Power Handling Capacity per EIA Standard RS 426A see Power Handling Capacity section 300 watts Maximum Woofer Acoustic Output 13 5 watts Sound Pressure Level at 1 Meter 1 Watt Input Anechoic Environment Band Limited Pink Noise Signal 300 to 2 000 Hz 102 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 3 106 60 5 000 20 000 Hz Vertical see Figure 3 50 11 Directivity Factor Rg Q 800 16 000 Hz Median see Figure 4 13 5 4 75 8 75 Directivity Index D 800 16 000 Hz Median see Figure 4 12 3 dB 0 3 dB 5 5 dB Distortion 0 1 Full Power Input Second Harmonic 100 Hz 5 1 000 Hz 4 10 000 Hz 7 Third Harmonic 100 Hz 2 5 1 000 Hz 2 5 10 000 Hz 1 8 Distortion 0 01 Full Power Input Second Harmonic 100 Hz 2 5 1 000 Hz 1 2 10 000 Hz 2 5 Third Harmonic 100 Hz 0 4 1 000 Hz 1 10 000 Hz 0 3 Transducer Complement High Frequency DH2010A driver HT94 horn Low Frequency High excursion EVM 15B Pro Line Box Tuning Frequency 55 Hz Crossover Frequency 1 600 Hz Crossover Slope 122. dB per octave Impedance Nominal 8 ohms Minimum 7 ohms Input Connections Parallel in phone jacks allows paralleling of multiple speakers Enclosure Materials and Colors Black carpet covered Road Wood Dimensions 55 9 cm 22 in high 57 1 cm 22 5 in wide 70 8 cm 27 9 deep Net Weight 34 2 kg 72 2 lb Shipping Weight 36 9 kg 81 2 10 Electro Voice a MARK IV company FIGURE 1 Axial Frequency Response 4 volts 10 feet Model FM 1502ER Floor Monitor Speaker System DESCRIPTION The compact Electro Voice FM 1502ER is a 300 watt two way high efficiency constant directivity stage monitor Possible system orientations are at 35 45 or perpendicular to the floor The system combines professional quality components arranged in a time coherent vertical array with an unusually durable Thiele Small aligned vented enclosure The result is clear and articulate high quality sound The enclosure is constructed of Road Wood a structural material made of layered and selectively oriented hardwood strands strongly bonded together with phenolic resins This high strength shell U S Patent 4 624 338 is covered with densely woven abuse resistant black carpeting The high frequency section of the FM 1502ER utilizes a 90 x 40 constant directivity horn driven by a one inch throat wide bandwiath titanium diaphragm driver This driver uses a unique convex drive Time Path phasing plug
3. 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 term average for several hours adding another extra measure of reliability Specifically the FM 1502ER 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 300 watts into the 6 4 ohms EIA equivalent impedance 43 8 volts true RMS Amplifier clipping sets instantaneous peaks at 6 dB above the continuous power or 1 200 watts peak 87 6 volts peak This procedure provides a rigorous test of both thermal and mechanical failure modes GRILLE REMOVAL The grille assembly of the FM 1502ER is fastened to the enclosure using four sturdy dual lock fasteners The grille assembly can be removed quickly and easily a
4. EVM 15B Pro Line unit featuring beryllium copper lead wires an extended length edgewound voice coil further protected by the unique EV Ther mo Inductive Ring TIR The part of the magnetic structure adjacent to the coil is insulated using the exclusive EV PROTEF process U S Patent 4 547 632 The coil is driven by a massive 16 10 magnetic structure 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 90 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 zones at certain frequencies The 90 x 40 dispersion characteristic also helps avoid early reflections from nearby floor or side wall surfaces which could degrade performance The controlled direc tivity of the high and low frequency transducers also eliminates response irregularities caused by diffraction off nearby enclosure edges and in combination with an essentially flat on axis frequency response produces a total acoustic powe
5. c 600 Cecil Street Buchanan Michigan 49107 Specifications subject to change without notice ELECTRO VOICE INC 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS AT BUCHANAN lB NEWPORT TN lB SEVIERVILLE TN lG REDMOND WA E GANANOQUE Electro Voice Inc 1989 Litho In U S A Part Nurnber 531212 913 MARK IV compon
6. llowing access to the drivers by firmly pulling on the two black polyester ribbon loops provided 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 49107 AC 616 695 6831 and or Electro Voice West 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 In
7. pt 7 octave No external equalization was used DIRECTIVITY A unique feature of the FM 1502ER is the constant directivity dispersion provided by the 90 x 40 horn The polar response of the system at selected 4 octave bandwidths is shown in Figure 2 These polar responses were measured in an anechoic environment at 10 feet using Ys octave pink noise inputs The frequencies selected are fully represen tative of the polar response of the system Beamwidth of the system utilizing the complete s octave polar data is shown in Figure 3 Rg and directivity index 0 are plotted in Figure 4 POWER HANDLING CAPACITY To 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
8. r output that is uniform with frequency ENCLOSURE CONSTRUCTION The FM 1502ER enclosure utilizes a struc tural material that combines the strength of high quality plywood with the density and acoustic damping of particle board without brittleness Road Wood uses the same principle of crossbanding veneers as in plywood in order to achieve its very high rigidity A tough liquid phenolic resin is blended with long narrow strands of hard wood 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 form pane 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 and recessed handles complete the picture and ensure that the FM 1502ER speaker system is ideally suited to a long and reliable life 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 1 This response was measured at 10 feet using 4 volt input in an anechoic chamber and was measured using swe
9. structure U S Patent 4 525 604 for smooth and extended high frequency performance The voice coil is coupled to the diaphragm with EV s exclusive Resonant Drive technology patent pending This increases and smooths the high frequency response and reduces the amount of internal equalization required for flat frequency response A self resetting high frequency protection circuit has been added to the FM 1502ER to prevent against accidental overdrive and improve system reliability lf the input power 10 000 Hz 16 000 2000 Hz 8 20 000 Hz Tas VERTICAL _ FIGURE 2 Polar Response octave pink noise 4 volts 10 feet L L 100 200 500 1000 2000 5000 10000 20000 40 HORIZONTAL FREQUENCY IN HERTZ FIGURE 3 Beamwidth vs Frequency Whole Space anechoic eee SPECIFIC As VALUES DIRECTIVITY FACTOR Ra Q DIRECTIVITY INDEX D dB sooo 10000 20000 FREQUENCY IN HERTZ FIGURE 4 Directivity vs Frequency Whole Space anechoic to the high frequency driver exceeds the nominal rating the protection circuit is activated and reduces the power delivered to the driver by 6 dB The system will remain in this mode of operation until the input power is reduced to a safe level The bass section of the FM 1502ER is designed using Thiele Small parameters for efficient performance to below 65 Hz The 15 inch woofer is a high excursion
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