Electro-Voice EVX-1800 User's Manual
Contents
1. FIGURE 2A EVX 1800 Single FIGURE 2B EVX 1800 FIGURE 2C EVX 1800 Single Driver Low Frequency Performance Single Driver Low Frequency Driver Low Frequency Performance 223 L 8 ft Enclosure Performance 283 1 10 ft Enclosure 336 1 12 5 ft Enclosure 25 Hz tuning 30 Hz tuning z tun z tuning un t 30 Hz tuning TU LIT JA LUI LE EET FEET ETT we Pal SPL in dB SPL in gB FIGURE 2D EVX 1800 FIGURE 2E EVX 1800 Multiple Driver Low Frequency Multiple Driver Low Frequency Performance 2 Driversina Performance 4 Drivers in a 566 1 20 93 Boxor2 1132 L 40 ft Box or 4 283 1 10 113 Boxes in Close 283 1 10 ft Boxes in Close Proximity Tuned to 25 Hz Proximity Tuned to 22 Hz BEAMWIDTH IN DEGREES Meet il 100 200 500 1000 2000 FREQUENCY IN HERTZ _ FIGURE 4 Directivity Index vs Frequency ve EVX 1800 TL3512 in a 255 1 9 0 ft Enclosure lt FIGURE 3 Beamwidth vs Frequency 7 EVX 1800 TL3512 in 255 1 9 0 ft Enclo X S adum ul Tos vm dm tra d EE Mee NS oy oe 24 ru d ta A x 2 v dr E DN CC i E C C a r tx E MAE wr a E zs yi A Peco Men P CK gt 22. 20 Hz R 5 0 ohms 0 264 Qing 7 53 Qas 0 274 Vas 767 L 27 3 cu ft 54 0 125 sq m 194 sq in Xmax 15 mm 0 60 in No 2 16 P 850 watts RS 426A 750 watts continuous sine wave iesponse in Standard Baffle Ahh HT m 4 4 i ERY E dL LLLI M I l i IJ 7 uf 1 P E AM XXX mE Gti CU NOTE AES requires a large planar baffle or this test WHICH IS INTENDED TO 3HOW SMOOTHNESS AND OFF AXIS 3ESPONSE NOT BASS RESPONSE This yas proven to be inconvenient and wohibitive due to its size Here we have shosen our lab standard low diffraction 12 cubic foot test enclosure which will jemonstrate the same characteristics as the AES standard baffle Distortion Response tm E NL SB Lu Lu d 1 LI ILI LE S n 220 mer 3 Bar EE ID 85 WATTS Impedance Response TEE TETTE TO geo S LN CHIC TT CAUTE T TETTE LNO HA i UNKT 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 configurations Two 2 Drivers f 19 5 Hz Q 0 274 Vas 53 8 cu ft 1522 L Four 4 Drivers f 18 7 Hz Q 0 282 109 0 cu ft 3085 L vesigners will find the following equation useful in tuning thei
3. SPECIFICATIONS Power Handling 1500 watts continuous program Voice Coil Diameter 102 mm 4 in Sensitivity SPL 1 W 1 M 100 800 Hz Average 95 dB Impedance 8 ohms Frequency Response 20 1 kHz Highest Recommended Crossover 200 Hz Magnet Assembly Weight 11 3 kg 25 Ibs THIELE SMALL PARAMETERS f 20 Hz R 5 0 ohms Qis 0 264 7 53 Qas 0 274 Vas 767 L 27 cu ft Sp 0 125 sq m 193 sq in Xmax 19 mm 0 60 in Displacement Limit 56 mm 2 2 in peak to peak No 2 16 850 watts RS 426A 750 watts continuous sine wave DESCRIPTION The EVX 1800 very low frequency transducer is designed for professional sound reinforce ment or studio monitoring applications that require maximum subwoofer output with extremely low distortion EVX 1800 provides unprecedented high power capacity and linear cone excursion ability made possible by the HeatWick total thermal engineering design and the revolutionary Internal Tandem Disk voice coil suspension The result is low frequency impact and punch that is simply not provided by traditional professional designs The 18 inch EVX 1800 has more output capability than any high performance 18 inch woofer 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 t
4. The EVX 1800 may be front or rear mounted against either surface of the mounting flange and requires a 422 mm 16 6 in diameter cutout and a 438 mm 17 25 in bolt circle Normal fasteners up to 6 mm Va 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 1800 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 releasng pressure One conductor of 9 AWG stranded 8 AWG solid a par of twisted 15 AWG stranded or a pair of 14 AWG solid conduc tors 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 DDITIONAL DESCRIPTIVE INFORMATION Voice Coil Material Aluminum Voice Coil Insulation Polyimide 220 degree C rating Coil Form Polyimide Magnet Frame Cast aluminum Thermal Rise after Power Test 82 degrees C 147 degrees F Recommended Enclosures 6 15 cubic foot 170 L 424 L Magnet Plating Bright cadmium hysical Constants Effective Piston Diameter 398 15 7 in Total Moving Mass 0 155 kg Voice Coil Winding Depth 36 mm 1 4 in Top Plate Thickness at Voice Coil 8 9 mm 0 35 in Z min 7 ohms BI Factor 20 3 Tm hiele Small Parameters f
5. aluminum ring shall be Teflon coated The voice coil shall be 102 mm 4 in in diameter and 35 5 mm 1 4 in in winding length and shall be made of edgewound aluminum ribbon The vorce coil shall be suspended in the magnetic gap by two spiders The spiders shall be attached to the inside diameter of the coil form and center of the pole piece The spiders shall be made of G 10 equivalent The voice coil shall produce a force of not less than 20 3 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 95 dB The half space reference efficiency shall be at least 2 1 The usable frequency response shall be 15 Hz to 1500 Hz and the nominal impedance shall be 8 ohms The rated power for the loudspeaker shall be 1500 watts normal program material The low frequency transducer shall be the Electro Voice EVX 1800 AES SPECIFICATIONS The following specifications are in accor dance with the AES Draft Recommended Practice for Specification of Loudspeaker Components Used in Professional Sound Reinforcement Systems 1983 Dimension and Weight Outer Diameter 46 cm 18 3 in Depth 21 cm 8 46 in Bolt Hole Diameter 7 1 mm 0 281 in Net Weight 14 kg 31 Ib Shipping Weight 16 8 ka 37 Ib Mounting
6. 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 1800 in the TL3512 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 ike 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 averge 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 1800 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 bandwidth in Hz is fed to a shaping filter with 6 dB per octave siopes below 40 Hz and above 318 Hz When m
7. is limited by either 1 the thermal power handling capacity or 2 the speaker s maximum cone excursion capabilities 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 half an octave a factor of 0 7 The resulting alignment is then equalized for flat response This procedure results in one half octave lower bass without any excursion penalty ARCHITECTS AND ENGINEERS SPECIFICATIONS The low frequency transducer shall have a nominal diameter of 460 mm 18 in overall depth not greater than 211 mm 8 42 in and weigh no more than 14 kg 31 Ib 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 transter path from the outer diarneter of the voice coil The inner diameter of the steel top plate and the lower
8. 4 a ey f Ra M s gt gt VA TAE he D any be Th 5 zd ace A Aes oe c z M e Sy EL IR nC or A a T x d E KA gt P CER FRE wor sf z eee f pe bur Pus gun Para E ja B 20 a y S NE te OF ELE ee x S MOX Sie es Se TEAT ET NG Po SAEs eee ee p WO 4 ce 4 WE gt ae E o os 5 RM gt Y y Sorts MEOS Midi dat 4 ean DES More E kun lt mou TE v VR As at 4 M ois T3 uu Ee 4 4 55 t4 X SAPE x sees 72 80 730 0 200 500 71000 2000 000 10000 gt 20000 o 2 x iS es Pee het FREQUENCYINMERTZ o FIGURE 5 Theoretical Low Frequency _ Maximum Acoustic Output vs Frequency 283 L 10 ft Enclosure Tuned to 30 Hz 400 Hz 180 800 Hz FIGURE 6 Polar Response DIRECTIONAL PERFORMANCE The directional characteristics of the EVX 1800 in the TL3512 256 L 9 ft vented enclosure were measured Dy running a set of polar responses in EV s large anechoic chamber The test signal was octave band limited pseudo random pink norse centered at the ISO standard frequencies 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
9. easured 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 1800 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 lowest distortion and best controlled bass performance 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 the air contained within the enclosure The excursion of the EVX 1800 at these frequen cies is much reduced compared to sealed or open back enclosures directly reducing harmonic distortion and the possibility of speaker bottoming Several specific vented enclosure retommendations are 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 acoustic power output versus frequency The maximum output
10. he entire length of the voice coil providing a major heat transfer path Also the 102 mm 4 in diameter voice Coil is 50 longer than conventional long throw coils to give additional power handling and virtually eliminate dynamic range power compression The EVX 1800 Internal Tandem Disk suspen sion provides the highest excursion capability over 2 inches peak to peak of any woofer for greatly increased low bass output and the lowest distortion possible at high levels The unique fiberglass epoxy suspension is formed from concentric cantilever disks attached inside the voice coil former This suspen sion voice coil assembly is fixed to the pole piece with cone excursion allowed by the flexure of the suspension disks Careful choices of materials and disk geometry allow high radia rigidity to reduce the risk of voice coil rubs and provide higher reliability than conventional cloth spider suspensions Additionally a Flux Demodulation Device FDD reduces distortion in the critical midband by providing a short circuit effect to prevent modulation of the static magnetic field To further increase reliability PROTEF a Teflon based coating is applied to the inner diameter ofthe top plate and FDD PROTEF Electro Voice a MARK IV COMO TT i LE S i PEE FREQUENCY H MERTZ FIGURE 1 Axial Frequency Response 1 Watt 1 Meter 12 Cubic Foo
11. r enclosures Sy 3 7 x 10 V f Where Ly Length of vent or thickness of baffle for hole in baffle in inches S Area of vent in square inches Vg Volume of box in cubic feet fa z Box tuning in Hz r z Radius of vent in inches K 1 7 for a hole in baffe 1 5 for a tube in inches IMPORTANT NOTE ON GRILLE COVERS Because of the extremely high excursion capability of the EVX 1800 it is important that users leave at least 1 1 inch clearance between the front gasket and a grille cover A suggested grille cover that will provide this protection is Middle Atlantic Audio part SGP EV 18 or equivalent WARRANTY Limited Electro Voice Speakers and Speaker Systems excluding active electronics are quaranteed for five years from date of original purchase against malfunction due to defects in workmanship and materials If such maifunc 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 excl
12. t Enciosure Tuned to 27 Hz EVX 1800 18 11011 Very Low Frequency Reproducer lubricates any rubbing contact and electrically insulates the coil to quard against violent short term power peaks A ribbed carbon fiber composite cone with an extremely high stiffness to weight ratio gives the EVX 1800 increased resistance to cone collapse and breakup without added efficiency robbing mass as compared to conventional paper designs FEATURE HIGHLIGHTS HeatWick Design Provides advanced thermal engineering to wick heat away from the voice coil for increased power handling and reliability Internal Tandem Disk Voice coil suspension provides a 50 mm 2 in peak to peak excursion for unprecendented low bass output High radial rigidity keeps coil centered in the gap at explosive volumes Extended Length 102 mm 4 in Voice Coil Has nearly twice the surface area of any other woofer to virtually eliminate dynamic range power compression Carbon Fiber Composite Cone For added protection against cone collapse and breakup without adding efficency robbing weight Rubber Mounting Flange Gasket Provides a reusable seal for front or rear fnounting completely surrounding the frame flange 1 500 Watt Continuous Program Power capacity without efficiency sacrifice for extremely high output with low distortion i 4 3 ill 35 Hz tuning
13. usion 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 Electro Voice Inc 3810 148th Avenue N E Redmond WA 98052 AC 206 881 9555 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 Inc 600 Cecil Street Buchanan Michigan 49107 Specifications subject to change without notice m ELECTRO VOICE 600 Cecil Street Buchanan Michigan 49107
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