Electro-Voice 18WK User's Manual
Contents
1. cps Power Handling Capacity Program Material 30 watts 30 watts Peak 60 watts 60 watts Critical Damping Factor 1 in infinite baffle 10 in Patrician or Residence Entertain ment Center Nominal Impedance 16 ohms 16 ohms D C Resistance 11 6 ohms 3 2 ohms Voice Coil Diameter 2 inches 2 inches Magnet Weight 5 Ibs Ibs Size 18 in dia x 18 in dia x 10 in deep overall 10 in deep overall Mounting Four 4 in holes equally spaced on 17 4 in circle Baffle Opening 16 in Depends on horn throat crea Net Weight 38 Ib 38 Ib Shipping Weight 43 b 43 b INSTALLATION Optimum bass response with E V low frequency driver units is obtained in the recommended baffles Where a baffle is available of the infinite type such as a closet or a wall with large volumetric capacity available behind the cone ex cellent results will be obtained in the accomplishment of the bass range The ideal volume for the 18W is 28 cubic feet or more for with this volume the low free space resonance of the bass cone becomes the controlling factor in achieving reproduction of the first octaves The response will be flat to 25 35 cps The 18SWK is recommended for use only in K type enclosures in which the back air load volume is restricted to approximately 6000 cubic inches In this applica tion the front radiation must be horn loaded Ww v Je a O a o e a a a Qu gt c a e 3 A WML pue MBL2. or glass block is good but should be covered with cheese cloth to confine the fibers Blankets jute and rug pads are satisfactory substitutes The rear cavity for the 18WK must be completely sealed and air tight for best bass response In this application padding is not needed The pre cise size of this cavity is dependent on the design application For further in formation refer to the bulletins om the construction of the Patrician and the Residence Entertainment Center MOUNTING THE SPEAKER Cut a circular hole 163 inches in diameter Four 4 inch mounting holes are provided on the outer periphery of the speaker frame Use four 12 x 114 inch long wood screws or preferably drill four 14 inch holes on a 17 4 inch circle spaced 90 degrees apart See Fig 1 for the hole arrange ment and employ four 4g inch carriage bolts 2 inches long with hex nuts and washers Secure the speaker to the front baffle and tighten the retaining screws just enough to compress the speaker gasket Do not tighten too much or the frame may be sprung out of line thus damaging the speaker unit OPERATION CONNECTIONS Use No 22 fixture wire or larger to connect the two terminals on the low frequency drivers to the Low and Common output terminals on the crossover network The exact crossover frequency is dependent on the appli cation bur it is recommended to be 600 cps or below The 16 ohm impedance of the driver units is a standard RETMA rat
3. SIaPOw 30104 04 19373 43 LOE T POS UACHE FI TO a NES gt Q lt a MK rs SH BPB 3 i 7 33 AT 37 O Pa O pezi 7 aeni Fig 2 Schematic Wiring Diagram Separate 3 Way System Residence Entertainment Center T35 BHOE DESTA PRESENCE AT 3 7 i Fig 3 Schematic Wiring Diagram Indirect Radiator 4 way System Patrician IV Where only a restricted space is available for housing the 18W low frequency driver bass response will suffer and the low range will be compressed by about 1 octave This deficiency may be offset somewhat by reinforcing the bass through porting the enclosure Start with an opening of about 130 square inches and gradually decrease this area until the most pleasing response is obtained The minimum volume advisable for such an enclosure is 12 cubic feet More accurate design data on this form of enclosure is available from the Reproducing Com ponents Division of Electro Voice and in the many articles on enclosure design now published Reflections on the interior cavity will cause ragged response indicated by undue reinforcement at certain frequencies and cancellation at others unless sound absorbent material is used on at least three of the opposing interior sides The material may be Kimsul 2 inches thick or equivalent Kimsul is available from any building supply house as a product of the Kimberly Clark Manufactur ing Company Glass wool
4. SlocheVorce ELECTRO VOICE INC a BUCHANAN MICHIGAN E j 18W and 18WK Fig 1 Dimensions Specifications and Instructions Models 18W and 18WK Low Frequency Drivers Incorporating all the design advantages of piston type low frequency drivers the E V 18 inch reproducers include also the latest developments in the electro acoustic art Bass response is phenomenal affording for the first time pleasing musical balance without the masking effects previously experienced from high cone resonance and inefficient voice coil gap designs E V low frequency drivers have special cone and spider suspensions as well as one piece welded magnetic structures of exclusive design Tailored to optimum listening requirements these new developments insure smooth even coverage of the entire bass spectrum FEATURES Exclusive E V engineered features include true concentric centering of the voice coil augmented balanced bass response in conjunction with the pro duction of a plane wave front especially rugged voice coil cone juncture edge wise wound aluminum voice coil design affording 18 more efficiency and con sequent damping of transient distortion heavy magnet structure with one piece all welded construction SPECIFICATIONS 18W 18WK Frequency Response Essentially flat to 600 cps Exact response depends on enclosure RETMA Sensitivity Rating 53 db 53 db Free Space Cone Resonance 25 35 cps 20 30
5. ing and is indicative of the voice coil impedance at crossover frequency A mismatch by as much as 40 may be made without affecting the reproduction or efficiency of the unit AMPLIFIER DAMPING CONTROL SETTING If your amplifier has a variable damping control as do all E V units set this control in accordance with the critical damping factor listed under specifications Gy ELECTRO VOICE INC BUCHANAN MICHIGAN Part No 53285 Printed in U S A C
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