Electro-Voice SP12B User's Manual
Contents
1. ay System 3355 He rioa 5P128 r23 ant F254 FIR _ _ connection WO CONNECT ON 4 AREO POS ALACH NEG Fig 3 Schematic Wiring Diagram Separate 3 way System EY ELECTRO VOICE INC Part No 53141 INSTALLATION Optimum bass response with the SP12 and SP12B units is obtained in the E V Aristocrat direct radiator Klipsch licensed corner horn Where a baffe is avail able of the infinite type such as a closet or a wall with large volumetric capacity available behind the cone excellent results will be obtained in the accom plishment of the bass range The ideal volume is 15 cubic feet or more for with this volume the low free space resonance of the bass cone becomes the controlling factor in achieving the first octaves This response will be flat to 35 45 cps Where restricted space of only 4 to 8 cubic feet is available for housing the speaker 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 most pleasing response is obtained More accurate design data on this form of enclosure is available from the Reproducing Components Division of Electro Voice and in the many articles on enclosure design now published Reflections on the interior cavity will cause ragged response i2. he unit If only an 8 ohm tap is available on the amplifier a loss of efficiency will be just noticeable Connected to a 4 ohm ter minal a loss of overall efficiency will be observed 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 denoted under Specifications THE BUILBING BLOCK METHOD All Electro Voice enclosures incorporate facilities for later addition of high frequency and midrange reproducers and their associated crossover networks The suggested optimum enclosure for the SP12 and SP12B the Aristocrat direct radiator corner horn has these features preinstalled Further details are covered in Bulletin SA10 the Building Block Select O Guide and the Aristocrat instruc tion brochure Installation data and instructions are packed with the individual units BASIC COAXIAL ORIVER SEPARATE SEPARATE FULL RAMGE WITH SEPARATE 2 WAY 3 WAY SYSTEM VHF DRIVER SYSTEM SYSTEM TY yY i H E V Building Block Method Compatibility Chart COAXIAL 2 WAY SYSTEMS BUCHANAN MICHIGAN Printed in U S A C
3. ndicated 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 or glass block is good but must be covered with cheese cloth to confine the fibers Blankets jute and rug pads are satisfactory substitutes MOUNTING THE SPEAKER Cut a circular hole 11 inches in diameter Four 14 inch mounting holes are provided on the outer periphery of the speaker frame Use four 12 x 1 4 inch long wood screws or preferably drill four inch holes on a 111 inch circle spaced 90 degrees apart See Fig 1 for hole arrange ment and employ four g 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 resulting in damage to the speaker unit OPERATION CONNECTIONS Use No 22 fixture wire or larger to connect the two terminals on the loudspeaker to the 16 ohm and Common output terminals on your amplifier The 16 ohm impedance of the SP12 and SP12B is a standard RETMA rating A mismatch by as much as 40 may be made without affecting the re production or efficiency of t
4. nusually heavy magnet structure is used The Models SP12 and SP12B may be used as low frequency drivers in expanded separate 2 and 3 way systems In this application the operation of these units is comparable to the E V Models 12W and 12BW LF drivers Compatible com ponents for use with these drivers are shown on the Building Block Method Compatibility Chart St SPECIFICATIONS K S mT m O ATS SP12 SP12B ee Yh gh See Frequency Response 30 to 13 000 cps 30 to 13 000 cps a8 J aE I RETMA Sensitivity Rating 48 db 46 5 db Pa SP12 Free Space Cone Resonance 35 45 cps 40 50 cps O m Power Handling Capacity TH Program material 25 watts 20 watts D Peak 50 watts 40 watts a Critical Damping Factor In Aristocrat enclosure 2 0 4 0 ies 2 zua In an infinite baffle 1 0 2 5 Impedance 16 ohms 16 ohms Mechanical Crossover 3000 cps 3500 cps x Voice Coil Diameter 2 2inches 2 inches Magnet Weight 3 Ibs 1 Ib Size 12 in dia x7 in 12 in dia x in overall depth overall depth Mounting Four 4 in holes equally spaced on 11 4 in circle Baffle Opening 11 inches 11 inches Net Weight 19 Ib 8 Ib Shipping Weight 25 Ib 12 Ib s DIA Fig 1 Dimensions Gyo Tica 3ng d Lesa ar _ gt Iz z CONNECTION a2 NO CONNECTION 4825 REO POS BLACA NEG Fig 2 Schematic Wiring Diagram Separate 2 w
5. oy Specifications and Elecho Vores s Instructions ELECTRO VOICE INC EE Models SP12 and SP12B AA A a Radax Coaxial Loudspeakers Incorporating all the design advantages of the famous E V Radax coaxial prin ciple the E V Models SP12 and SP12B full range coaxial reproducers include the latest developments in the electro acoustic art Bass response is extended afford ing for the first time pleasing musical balance without the masking effects pre viously experienced from increased high frequency reproduction Tailored to optimum listening requirements these new developments insure smooth even coverage of the entire listening area FEATURES Exclusive E V engineered features include true coaxial mounting of both reproducing elements insuring smooth room coverage augmented balanced bass response in conjunction with smooth extended high frequency reproduction The carefully tailored midrange characteristic provides realism and presence at usual sound levels offsetting ear insensitivity at low volume The exclusive Radax design features a true acoustical crossover in which the mass of the bass cone and its voice coil coupling compliance is so proportioned as to de couple the woofer above crossover The Radax unit is free from phasing dips and displays less than 14 harmonic distortion above crossover The edgewise wound aluminum voice coil design affords 18 more efficiency and consequent damping of transient distortion An u
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