Electro-Voice FM-1202 User's Manual
Contents
1. SPECIFICATIONS Frequency Response 10 Feet on Axis Swept 1 3 Octave Half Space Anechoic Environment see Figure 1 75 20 000 Hz Low Frequency 3 dB Down Point 75 Hz Usable Low Freauency Limit 10 dB down point 60 Hz Half Space Reference Efficiency 5 9 Long Term Average Power Handling Capacity per EIA Standard RS 426A see Power Handling Capacity section 300 watts Maximum Woofer Acoustic Output 17 7 watts Sound Pressure Level at 1 Meter 1 Watt Input Anechoic Environment Band Limited Pink Noise Signal 300 to 2 000 Hz 101 5 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 3 109 4 60 5 000 20 000 Hz Vertical see Figure 3 44 210 Directivity Factor Rg Q 800 16 000 Hz Median see Figure 4 12 5 5 5 10 Directivity Index Dj 800 16 000 Hz Median see Figure 4 11 dB 1 5 dB 7 dB Distortion 0 1 Full Power Input Second Harmonic 100 Hz 3 1000 Hz 6 10 000 Hz 10 Third Harmonic 100 Hz 1 1000 Hz 2 10 000 Hz 3 5 Distortion 0 01 Full Power Input Second Harmonic 100 Hz 1 1000 Hz 2 10 000 Hz 3 Third Harmonic 100 Hz lt 1 1000 Hz 2 10 000 Hz lt 1 Transducer Complement High Frequency One inch titanium diaphragm driver 90 x 40 constant directivity horn Low Frequency EVM 12S Pro Line Box Tuning Frequency 70 Hz Crossover Slope 12 dB per octave I2. abuse resistant carpeting provides a finish that is both attractive and highly durable Large heavy duty meta corner protectors firmly secured rubber feet and recessed handles complete the picture and ensure that the FM 1202 speaker system is ideally suited to a long and reliable life on the road FREQUENCY RESPONSE The combination of a 12 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 a 4 volt input in an anechoic chamber and was measured using swept 1 3 octave No external equalization was used DIRECTIVITY A unique feature of the FM 1202 is the constant directivity dispersion provided by the 90 x 40 horn The polar response of the system at selected 1 3 octave bandwidths is shown in Figure 2 These polar responses were measured in an anechoic environment at 10 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 utilizing the complete 1 3 octave polar data is shown in Figure 3 Rg Q and directivity index Dj 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 freque
3. elow 75 Hz The 12 inch woofer used in the system is an EVM 12S Pro Line unit featuring beryllium copper lead wires and an edgewound voice coil The part of the magnetic structure adjacent to the coil is insulated using the exclusive EV PROTEF process The coi is driven by a massive 16 lb magnetic structure Rez PEE EES ES SER RS de R A J lj H Va BEAMWIDTH IN DEGREES 6 dB HORIZONTAL O VERTICAL A DIRECTIVITY FACTOR Rg Q J Wy jy SEZ D gem ke HH CE VEE Y Ed 5 dB per Division FIGURE 2 Polar Response 1 3 octave pink noise 4 volts 10 feet b N A FA Wenta rR T SOOTY Y SERS rT TR age R Y 8 8883885 Y g ggZ Z MEE FREQUENCY IN HERTZ FIGURE 3 Beamwidth vs Frequency Whole Space anechoic FEIT B 8 8 BBaABEE WETTE IT FREQUENCY IN HEATZ FIGURE 4 Directivity vs Frequency Whole Space anechoic Eg Va dd DIRECTIVITY INDEX CONSTANT DIRECTIVITY SPEAKER SYSTEM The crossover frequency and speaker component geometries have been selected so that the directional charac teristics 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 transiti
4. mpedance Nominal 8 ohms Minimum 5 4 ohms Input Connections Parallel 1 4 in phone jacks allows paralleling of multiple speakers Enclosure Materials and Colors Black carpet covered Road Wood Dimensions 49 2 cm 19 4 in high 49 2 cm 19 4 in wide 61 9 cm 24 4 in deep Net Weight 29 5 kg 65 Ib Shipping Weight 32 2 kg 71 Ib ElectoVoice a on COMPANY dy Model FM 1202 Floor Monitor Speaker System DESCRIPTION The compact Electro Voice FM 1202 is a 300 watt two way high efficiency constant directivity stage monitor Possible system orientations are at 35 45 or perpendicular to the floor It 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 hard wood strands The covering is abuse resistant black carpeting The high frequency section of the FM 1202 utilizes a die cast 90 x 40 constant directivity horn driven by a one inch throat wide bandwidth titanium diaphragm driver This driver uses a unique convex drive Time Path phasing plug structure patent pending for smooth and extended high frequency performance The bass section of the FM 1202 is designed using Thiele Small parameters for efficient performance to b
5. ncies 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 term average for several hours adding another extra measure of reliability Specifically the FM 1202 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 point
6. ons to a 40 to 50 angle above 5000 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 wail surfaces which could degrade performance The controlled directivity of the high and low frequency transducers also eliminates response irreqularities caused by diffraction off nearby enclosure edges and in combination with an essentially flat on axis frequency response produces a total acoustic power output that is uniform with frequency ENCLOSURE CONSTRUCTION The FM 1202 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 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 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
7. s are at 100 Hz and 1200 Hz with a 3 dB per octave slope above 1200 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 1200 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 1202 is fastened to the enclosure using four sturdy dual lock fasteners The grille assembly can be removed quickly and easily allowing access to the drivers by firmly pulling on the two black polyester ribbon loops provided
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