Electro-Voice EVX-150A User's Manual
Contents
1. is usually realized in properly designed vented enclosures In such designs the vent or port actually provides the lowest octave of output The vent is driven to full acoustic output by a relatively small motion of the speaker cone itself acting through tha air contained within the enclosure The excursion of the EVX 150A at these frequencies is much reduced compared to sealed or open back enclosures directly reducing harmonic distortion and the possibility of speaker bottoming Several specific vented enclo sure recommendations are shown on the previous page Alternate tunings are given so that designers can tailor the low frequency response to their specific needs Figure 5 shows the maximum long term SPL versus frequency The maximum output is limited by either 1 the long term thermal power handling capacity or 2 the speaker s maximum cone excursion capability whichever occurs first Also provided are recommended enclosures for multiple driver configurations STEP DOWN OPERATION For extended low frequency operation the vent area can be reduced by one half thereby tuning the enclosure to the step down mode In step down the tuning frequency is reduced by one half octave a factor of 0 7 The resulting alignment is then equalized for flat response This procedure results in one half octave lower bass ARCHITECTS AND ENGINEERS SPECIFI CATIONS The low frequency transducer shall have a nominal diameter of 3812. mm 15 in overall depth not greater than 168 mm 6 71 in and weigh no more than 10 kg 22 Ibs The frame shall be made of die cast aluminum to resist deformation The magnetic assembly shall have an extended pole piece to reduce inductive variances with excursion and provide a symmetrical magnetic field at the voice coil gap Two aluminum rings shall encircle the pole piece above and below the magnetic gap and shall have internal diameters concentric with the internal diameter of the steel top plate The upper ring shall be part of the loudspeaker frame Both rings act to reduce flux modulation and provide a heat transfer path from the outer diameter of the voice coil The inside diameter of the lower aluminum ring and the inside diameter of the steel top plate shall be Teflon coated The voice coil shall be 100 mm 4 in in diameter and 20 3 mm 0 8 in in winding length and shall be made of edgewound aluminum ribbon When centered in the magnetic gap the voice coil shall produce a force of not less than 20 64 Newtons Tesla Ampere Meters with a dc current of 1 ampere Performance specifications of a typical production unit shall be as follows Measured sensitivity SPL at 1 m 3 3 ft with 1 watt input averaged between 100 800 Hz pink noise shall be at least 98 dB The half space reference efficiency shall be at least 3 7 The usable response frequency shall be 30 Hz to 1 8 kHz and the nominal impedance shall be
3. 8 ohms The rated power for the loudspeaker shall be 1000 watts normal program material The low frequency transducer shall be the Electro Voice EVX 150A AES SPECIFICATIONS The following specifications are in accordance with the AES Draft Recommended Practice for Specification of Loudspeaker Components Used in Professional Sound Reinforcement Systems 1983 Dimension and Weight Outer Diameter 38 8 mm 15 28 in Depth 168 mm 6 71 in Bolt Hole Diameter 7 1 mm 0 281 in Net Weight 10 kg 22 Ib Shipping Weight 12 3 kg 27 Ib Mounting The EVX 150A may be front or rear mounted against either surface of its mounting flange and requires a 353 mm 13 9 in diameter cutout and a 371 mm 14 6 in bolt circle Normal fasteners up to 6 mm in will fit through the eight holes in the frame Front mounting is simplest using the optional SMH 1 speaker mounting kit Electrical Connections The EVX 150A is fitted with a pair of chrome plated frame mounted connectors with color coded ends Electrical connection is made by pushing down inserting wire completely through the rectangular slot and releasing pressure One conductor of 9 AWG stranded 8 AWG solid a pair of twisted 15 AWG stranded or a pair of 14 AWG solid conductors will fit A positive electrical signal applied to the red terminal will displace the cone away from the magnet thus producing a positive acoustic pressure ADDIT
4. IONAL DESCRIPTIVE INFORMATION Voice Coil Material Aluminum Voice Coil Insulation Polyimide 220 degree C rating Coil Form Polyimide Frame Cast aluminum Plating of Steel Parts Bright cadmium Thermal Rise after Power Test 82 degrees C 147 degrees F Recommended Enclosures 3 7 cubic foot 85 L 198 L Physical Constants Effective Piston Diameter 318 mm 12 5 in Total Moving Mass 0 069 kg Voice Coil Winding Depth 20 3 mm 0 8 in Voice Coil Winding Length 35 22 m 115 52 ft Top Plate Thickness at Voice Coil 8 89 mm 0 35 in Zo 7 2 ohms BI Factor 20 4 T m Thiele Small Parameters f 35 4 Hz R 5 8 ohms V 220 L 7 77 cu ft S 079 sq m 123 sq in X max 6 35 mm 0 25 in n 3 72 P 600 watts EIA RS 426A 500 watts continuous sine wave Response in Standard Bafile ani LIT TII iW AM a ACT Un TRH EE AHH ANNAA BANIE NEO DANN IRR A ANN TETES m ett NOTE AES requires a large planar baffle for this test WHICH IS INTENDED TO SHOW SMOOTHNESS AND OFF AXIS RE SPONSE NOT BASS RESPONSE This has proven to be inconvenient and prohibitive due to its size Here we have chosen our lab standard low diffraction 12 cubic foot test enclosure which will demonstrate the same characteristics as the AES standard baffle Distortion Response INI afb jo LETT Lt Y nupt i 5 Ati B T ct a LEUTE ee A CN XM IAM INNO BEI Peau aE SASL WUT A
5. SPECIFICATIONS Power Handling 1000 watts continuous program Voice Coil Diameter 102 mm 4 in Sensitivity SPL 1 W 1 M 100 800 Hz Average 98 dB Impedance 8 ohms Frequency Response see Figure 1 30 1800 Hz Highest Recommended Crossover 800 Hz Magnet Assembly Weight 7 7 kg 17 ibs THIELE SMALL PARAMETERS f 35 4 Hz R 5 8 ohms Q 0 240 Q 5 65 Q 0 251 V 220 L 7 77 cu ft S 0 079 sq m 123 sq in X ns 9 395 mm 0 25 in Displacement Limit 36 mm 1 41 in peak to peak n 3 72 P 600 watts EIA RS 426A 500 watts continuous sine wave VJ 30 15 i S DESCRIPTION The EVX 150A series low frequency transducers are designed for professional sound reinforcement or studio monitoring applications that require maximum output with low distortion EVX 150A provides unprecedented power capacity linearity and excursion made possible by the HeatWick total thermal engineering design The proprietary HeatWick design actually wicks heat away from the voice coil significantly increasing power handling and long term reliability A special frame extension and elongated pole piece provide a metal surface with close proximity to the entire length of the voice coil providing a major heat transfer path Also the 100 mm 4 in diameter voice coil is longer than conventional high efficiency woofers to give additional power handling and virtually eliminate dynamic range power co
6. TT FREQUENCY M HERT ACO CS UNA eT TA 60 WATTS Impedance Response a IMPEDANCE IN OHMS MULTIPLE DRIVER APPLICATION When used in arrays and multiple driver bass boxes the system Thiele Small parameters can be synthesized as follows This data should be used for multiple driver configura tions Two 2 Drivers f 34 3 Hz Q 0 248 Va 15 5 cu ft 439 L Four 4 Drivers f 32 9 Hz 0 258 V 31 1 cu ft 880 L Designers will find the following equation useful in tuning their enclosures S Lo CaTXTOWAR C Where L Length of vent or thickness of baffle for hole in baffle in inches Area of vent in square inches a Volume of box in cubic feet f Box tuning in Hz r Radius of vent in inches K 1 7 for a hole in baffle 1 5 for a tube WARRANTY Limited Electro Voice products are guaranteed against malfunction due to defects in materials or workmanship for a specified period as noted in the individual product line statement s below or in the individual product data sheet or owner s manual beginning with the date of original purchase If such malfunction occurs during the specified period the product will be repaired or replaced at our option without charge The product will be returned to the customer prepaid Exclusions and Limitations The Limited Warranty does not apply to a exterior finish or appearance b certain
7. URE 2C EVX 150A Single Driver Low Frequency Performance 99 L 3 5 ft Enclosure Single Driver Low Frequency Performance 141 L 5 0 ft Enclosure FIGURE 2E EVX 150A Multiple Driver Low Frequency Performance 4 Drivers in a 566 L 20 f Box or 2 283 L 10 ft Boxes in Close Proximity Tuned to 42 Hz D dB DIRECTIVITY INDEX FIGURE 4 Directivity Index vs Frequency EVX 150A TL606A in a 90 L 3 2 ft Enclosure REVERBERENT FIE ROOM CONSTANT FIGURE 6 Polar Response The curves show horizontal side to side dispersion when the enclosure s long axis is vertical The vertical up and down polar responses deviate only slightly from the horizontal responses due to box geometry Typical data is provided in Figures 3 and 4 which indicate 6 dB down beamwidth versus frequency and directivity factor respectively for an EVX 150A in the TL606A enclosure POWER HANDLING TEST 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 t
8. est 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 Specifically the EVX 150A model is designed to withstand the power test described in 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 band width 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 1200 Hz with a 3 dB per octave slope above 1200 Hz The signal has a 6 dB crest factor This procedure provides a rigorous test of both thermal and mechanical failure modes The EVX 150A has also been power tested with a two hour sine wave at minimum impedance so that competitive comparisons can be made using consistent methods Continuous program power is defined as 3 dB above double the continuous sine wave power rating RECOMMENDED ENCLOSURES The most extended bass lowest distortion and best control
9. lifier signal modulation of the static magnetic field Rubber Mounting Flange Gasket Provides a reusable seal for front or rear mounting completely surrounding the frame flange 1 000 Watt Continuous Program Power capacity without efficiency sacrifice for extremely high output with low distortion DIRECTIONAL PERFORMANCE The directional characteristics of the EVX 150A in a 90 L 3 2 f vented enclosure were measured by running a set of polar responses in EV s large anechoic chamber see Figure 6 The test signal was octave band limited pseudo random pink noise centered at the ISO standard frequencies SPL in dB jz tuning W T FREQUENCY IN MERTZ FIGURE 2A EVX 150A Single Driver Low Frequency Performance 71 L 2 5 f Enclosure M wo iw x FREQUENCY IN HERTZ FIGURE 2D EVX 150A Multiple Driver Low Frequency Performance 2 Drivers in a 283 L 10 ft Box or 2 141 L 5 ft Boxes in Close Proximity Tuned to 44 Hz LT mi s ii i BEAMWIDTH IN DEGREES FREQUENCY Hz FIGURE 3 Beamwidth vs Frequency EVX 150A TL606A in a 90 L 3 2 ft Enclosure 3 200 FREQUENCY IN HERTZ FIGURE 5 Theoretical Low Frequency Maximum SPL vs Frequency 283 L 5 ft Enclosure Tuned to 45 Hz FIGURE 2B EVX 150A FIG
10. mpression Additionally a Flux Demodulation Device FDD reduces distortion in the critical midband by providing a short circuit effect to prevent amplifier signal modulation of the static magnetic field To further increase reliability PROTEF Teflon coating is applied to the internal diameter of the FDD and top plate PROTEF lubricates any rubbing contact and electrically insulates the coil from the FDD and top plate to guard against violent short term power peaks A ribbed Kevlar fiber composite cone with an extremely high stiffness to weight ratio and exceptional strength gives the EVX 150A increased resistance to cone collapse and deformation without sacrificing efficiency or midrange response Patent 44 547 632 Electo Voice a MARK IV company FIGURE 1 Axial Frequency Response 1 Watt 1 Meter 5 0 Cubic Foot Enclosure EVX 150A 15 Inch Low Frequency Reproducer FEATURE HIGHLIGHTS o HeatWick Design Provides advanced thermal engineering to wick heat away from the voice coil for increased power handling and reliability Extended Length 100 mm 4 in Voice Coil Has nearly twice the surface area of any other woofer to virtually eliminate dynamic range power compression Kevlar Fiber Composite Cone For added protection against cone collapse and breakup without adding efficiency robbing weight Flux Demodulaton Device FDD Considerably reduces midband distortion by preventing amp
11. specific items described in the individual product line statement s below or in the individual product data sheet or owner s manual c malfunction resulting from use or operation of the product other than as specified in the product data sheet or owner s manual d malfunction resulting from misuse or abuse of the product or e malfunction occurring at any time after repairs have been made to the product by anyone other than Electro Voice or any of its authorized service representatives Obtaining Warranty Service To obtain warranty service a customer must deliver the product prepaid to Electro Voice or any of its authorized service representatives together with proof of purchase of the product in the form of a bill of sale or receipted invoice A list of authorized service representatives is available from Electro Voice at 600 Cecil Street Buchanan MI 49107 616 695 6831 and or Electro Voice West at B234 Doe Avenue Visalia CA 93291 209 651 7777 Incidental and Consequential Damages Excluded Product repair or replacement and return to the customer are the only remedies provided to the customer Electro Voice shall not be liable for any incidental or consequential damages including without limitation injury to persons or property or loss of use Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you Other Rights This warrant
12. y gives you specific legal rights and you may also have other rights which vary from state to state Electro Voice Speakers and Speaker Systems are guaranteed against malfunction due to defects in materials or workmanship for a period of five 5 years from the date of original purchase The Limited Warranty does not apply to burned voice coils or malfunc tions such as cone and or coil damage resulting from improperly designed enclo sures Electro Voice active electronics associated with the speaker systems are guaranteed for three 3 years from the date of original purchase Additional details are included in the Uniform Limited Warranty statement Service and repair address for this product Electro Voice Inc 600 Cecil Street Buchanan Michigan 49107 Specifications subject to change without notice Teflon is a registered trademark of Du Pont Corporation Kevlar is a registered trademark of Du Pont Corporation ELECTRO VOICE INC 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS AT BI BUCHANAN MI lI NEWPORT TN MB SEVIERVILLE TN BI OKLAHOMA CITY OK lll GANANOQUE ONT Part Number 531642 221 GElectro Voice Inc 1992 W Litho ip U S A MARK IV company
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