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Telex 18BX User's Manual

1. ElectoVoice SPECIFICATIONS Usable Frequency Response in a Typical Vented 8 0 Cubic Foot Enclosure 1 watt 1 meter see Figure 1 30 4 000 Hz Sound Pressure Level 1 watt 1 meter 101 dB Long Term Average Power Handling Capacity per EIA RS 426 A 1980 see Power Handling section 400 watts Nominal Impedance 8 ohms Voice Coil Diameter 63 5 mm 2 5 in Thiele Small Driver Parameters f free air resonance frequency 31 Hz Q electromagnetic Q at f 0 33 Q mechanical Q at f 6 98 Q total Q at f ee 0 31 V volume of air having same acoustic compliance as driver suspension 623 0 liters 22 0 ft 1 half space reference efficiency 5 2 V peak displacement volume of diaphragm S x X nax 0 463 liters 0 0164 ft S effective diaphragm area 0 114 m 176 7 in X ax peak linear displacement of diaphragm 4 06 mm 0 16 in R de resistance of voice coil 6 0 ohms 10 eee error rrerer e e STS E eee Wlenebereceeecccccecsss sss OEE ENE 1 RY THOS See ewe w es Mounting Information see Installation section Mounting Hole Diameter eight evenly spaced holes 7 1 mm 0 28 in etter L drill Bolt Circle Diameter 370 mm 14 56 in Baffle Opening Diameter Front Mounting 422 mm 16 63 in Rear Mounting 416 mm 16 38 in Optional Mounting Accessory SMH 1 mounting hardware kit Dimensions see Figure 2 Overall Diameter 460 mm 18 10 in Overall
2. Machine Screw for Front Mounting 8 0 ft 1 Watt 1 Meter not to scale m 110 SPL In dB 8 n 3 FREQUENCY IN HERTZ BUTTON HEAD MACHINE SCREW FIGURE 2 18BX Dimensions 203 mm ikiss FIGURE6 Connection of Two 18BX Speakers in Parallel net impedance is 4 ohms 190 mm 7 5 in FIGURE 7 Connection of Two 188X Speakers in Series A FIGURE 3 Front Mounting Detail not to scale net impedance is 16 ohms FIGURE 8 Connection of Four 18BX Speakers in Series Paralle net impedance is 8 ohms RED _ BLACK rep ___ BLACK ame neo aLack Reo BLACK FIGURE 4 Rear Mounting Detail not to scale T NUT FLAT WASHER LOCK WASHER lowest notes that will be played through it For standard tuning four string bass a 44 Hz tuning is recommended The low E on a bass guitar actually vibrates at 41 2 Hz but a 44 Hz tuning will provide a reasonable amount of vent contri bution or additional output at 41 2 Hz Similarly an enclosure tuning of 34 Hz is recommended for a system that will reproduce standard five or six string signals If a four string bass with a dropped D is used the recommended tuning frequency is 40 Hz For any of the above examples the recommended enclosure inter nal volume is between five and ten cubic feet The larger the volume the less equalization will be required An enclosure volume of eight cubic feet is ample for
3. Some states do not allow the exclusion or limitation of incidental or consequential dam ages so the above limitation or exclusion may not apply to you Other Rights This warranty gives you specific legal rights and you may also have other rights which vary from state to state Electro Voice Speakers and Speaker Sys tems are guaranteed against malfunction due to defects in materials or workmanship for a period of five 5 years from the date of origina purchase The Limited Warranty does notapply to burned voice coils or malfunctions such as cone and or coil damage resulting from improp erly designed enclosures Electro Voice active electronics associated with the speaker sys tems 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 616 695 6831 or 800 234 6831 Specifications subject to change without notice
4. most situations INSTALLATION The 18BX may be front or rear mounted al though front mounting is preferred because of convenience For simple front mounting the convenient SMH 1 mounting accessory is rec ommended Complete mounting instructions are included with the SMH 1 Instructions for standard front mounting are given below It is important that recommended baffle openings and mounting hole locations be followed Front Mounting Front mounting requires a 422 mm 16 63 in diameter cutout and a 438 mm 17 25 in bolt circle Mark the baffle opening and screw loca tions on the blank panel first Drill the screw holes before cutting the large baffle opening if 4 20 screws are used four screws are sufficient for secure mounting of the speaker T nuts are recommended for simple secure mounting If T nuts are used the holes should be 7 1 mm 0 281 in diameter letter L drill Apply glue to the flanges of s 20 long shank T nuts before driving into the rear of the holes Sealing of the front mounted speaker is accom plished with the adhesive backed foam gasket segments that are included with yournew 18BX Strip off the protective paper and apply the gasket to the rear mounting surface of the speaker rim making certain that the holes in the gasket line up with the mounting holes in the speaker frame Length of the 4 20 screws should be 2 inch plus the panel thickness when using T nuts The screws should be
5. Depth 203 mm 8 0 in Net Weight 9 9 kg 22 Ib Shipping Weight 12 0 kg 26 5 Ib DESCRIPTION The Electro Voice 18BX is an 18 inch speaker designed for professional high level high qual ity musical instrument systems For bass guitar use the 18BX can provide stronger than usual output at the lowest bass tones 30 50 Hz and its high frequency response is tailored for a traditional bass sound The 18BX incorporates voice coil and suspension refinements includ ing beryllium copper flatwire leads that have improved performance Power capacity is 400 watts per EIA RS 426 A 1980 The Power Handling section describes these ratings in detail The construction of the 18BX features an over hung low mass edge wound voice coil on a rugged laminated polyimide coil form driven by 18BX 18 Inch Long Throw Bass Guitar Loudspeaker e Contoured response for bass guitar e improved low frequency performance tess distortion at low frequencies e Ideal upgrade speaker e 400 watts long term power capacity e Edge wound flat aluminum wire for maximum output and bulletproof reliability e 101 0B sensitivity our large 16 lb magnetic structure Also fea tured are a heavy duty curvilinear cone and a fatigue resistant cone suspension Both the coil and magnetic structure are vented All of this is packaged around a rugged eight spoke diecast aluminum frame The 18BX may be front or rear mounted with out
6. an adapter The optional SMH 1 speaker mounting kit facilitates front mounting see In stallation section RECOMMENDED ENCLOSURES Replacement Use in Existing Enclosures The 18BX will often be used to replace inferior speakers in existing enclosures Mechanical and electrical characteristics are such that the superior efficiency sound quality and reliability of the 18BX will be realized in virtually any sealed vented bass reflex or horn loaded enclosure Vented 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 repro duces the lowest octave or so of bass re sponse 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 18BX at these frequencies is much reduced com pared to sealed or open backed enclosures directly reducing harmonic distortion Often in bass guitar systems a perfectly flat response is not as important as a controlled response Typical sound reinforcement sys tems are tuned so the enclosure provides the flattest possible response Generally bass guitar system performance is improved if the enclosure is vented or tuned for roughly the 18BX SPECIFICATION GRAPHICS FIGURE 1 18BX Frequency Response in Typical Enclosure FIGURE 5 Button Head
7. as measured with the 18BX in a 8 0 cubic foot vented enclosure tuned to 34 Hz placed in an anechoic echoless environment at 1 meter on axis with a 1 watt swept sine wave input The frequency response curve is shown in Figure 1 POWER HANDLING In musical instrument systems unlike sound reinforcement systems it is advisable to use speakers that are rated for at least as much power as your amplifier output rating To our knowledge Electro Voice was the first U S manufacturer to develop and publish a power test closely related to real life conditions Specifically the 18BX is designed to withstand the power test described in EIA RS 426 A 1980 The EIA test spectrum is applied for eight hours This shaped signal is sent to a power amplifier with the continuous power set at 400 watts into the 6 9 ohms EIA equivalent imped ance 52 5 volts true rms Amplifier clipping sets instantaneous peaks at 6 dB above the continuous power or 1 600 watts peak 105 1 volts peak This procedure provides a rigorous test of both thermal and mechanical failure modes UNIFORM LIMITED WARRANTY Electro Voice products are guaranteed against malfunction due to defects in materials or work eet manship for a specified period as noted in the individual product line statement s below orin 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 p
8. button head machine screws to seat down in the recess of the speaker frame gasket see Figure 3 Screws should be tightened evenly and securely Maximum torque possible with a proper size screwdriver should be sufficient IMPORTANT When front mounting the screw head must fit down into the front gasket cutout see Figure 3 Rear Mounting Rear mounting requires a 416 mm 16 38 in cutout with a screw circle the same diameter as front mounting 438 mm 17 25 in Other com ments regarding the use of T nuts apply to rear mounting as well Screw length should be 3 4 inch plus panel thickness if using T nuts ionger for standard hex nuts If hex nuts are used a second nut should be tightened against the first nut to prevent loosening during operation A lock washer and flat washer are recommended be tween the screw head and frame see Figure 4 Screws should be tightened evenly but not excessively Maximum torque possible with a proper size screwdriver should be sufficient Do not use adhesive back gasket segments for rear mounting Custom Enclosures If a cabinet is to be constructed from scratch 3 4 inch solid and jointed or marine plywood is recommended After construction be certain interior is completely free of metal filings wood chips etc Electrical Connections Use no 18 or larger stranded wire to connect the two terminals on the loudspeaker to the amplifier output FREQUENCY RESPONSE Frequency response w
9. roduct will be repaired or replaced at our option without charge The product will be returned to the customer pre paid Exclusions and Limitations The Limited Warranty does not apply to a exterior finish or appearance b certain specific items described in the individual product line statement s be low 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 productin 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 or 800 234 6831 Incidental and Consequential Damages Excluded Product repair or replace ment 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 limi tation injury to persons or property or loss of use

Telex 18BX User's Manual

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