Electro-Voice SRO/15 User's Manual
Contents
1. DESCRIPTION Speakers used with amplified instruments are subjected to the severest possible operational and handling conditions Even so failure of a speaker in live performance is in tolerable The SRO 1S musical instrument speaker com bines reliability with high efficiency A massive die cast speaker basket and epoxy bonded magnetic structure as sure precise alignment of moving parts regardless of the amount of handling encountered during normal usage The powerful magnet structure combines with an ex tremely efficient edgewise wound copper voice coil to produce greater sound pressure level for the same ampli fier input Efficiency of the SRO 15 is up to 3 db greater tham original equipment music speakers and that is the equivalent of doubling your amplifier output Efforts to improve the reliability of musical instrument speakers center on two main causes of failure destruction of the voice coil assembly from excessive power dissipa tion and mechanical failure caused by over driving the mechanical suspension Careful attention to detail in design and construction of the SRO I5 speaker allow unsurpassed power ratings The continuous sine wave rating of 60 watts applies to continuous output instru ments such as electronic organs The initial pulse of a plucked guitar string on the other hand produces many times the power of a continuous tone In such cases the mechanical power limit is of greater importance than the averag2. Oz Indox Ceramic Magnet Structure 16 Ibs EIA Sensitivity Rating 54 db Dimensions 15 1 8 dia x 8 1 4 overall depth Baffle Opening 13 Mounting Four 9 32 holes equally spaced ona 147 16 circle Net Weight 25 Ibs If speaker depth is excessive for a particular cabinet it may be reduced to 6 3 8 by removing the rear cover Pry off the nameplate with a knife blade and remove large machine screw Neither operation nor warranty is affected if cover is properly removed However because the cover does provide some additional protection against foreign particles it should not be removed unless space limitations require it CONNECTIONS Use No 18 or larger fixture wire to connect the two terminals on the loudspeaker to the amplifier output If a choice of amplifier output impedance is available 4 8 16 ohms a single SRO 15 speaker should be connected to the 8 ohm tap If two SRO 15 speakers are used they should be connected in parallel Be sure to connect the red terminals together as shown in Figure 2 If a choice of amplifier taps is available connection should be made to the 4 ohm tap If an array of four speakers is desired wiring and polarity should follow Figure 3 The correct impedance tap for this configura tion is 8 ohms If a choice of amplifier impedance taps is not available as in the case of solid state amps following the above wiring directions will provide the correct im pedance for most a
3. e power A single SRO 15 will handle with ease guitar amplifiers of up to 300 watts peak output as normally rated So reliable is the SRO I5 that it is guaranteed for life against failure under normal operating conditions INSTALLATION The SRO 15 is an excellent choice for replacing the present speakers in your system upgrading sound quality as well as reliability Cabinet requirements are not critical you need not worry about modifications to your existing DSRU ID 1D INGN MUSICAL INSTRUMENT LOUDSPEAKER 5 16 DIA THAU 4 HOLES EQUALLY a SPACED ON 147 16 B C Rr xe sia OIA 4 Dia m PTS Figure Dimensions cabinet However if a system is being built from scratch a properly designed enclosure will insure that your sys tem benefits from the full performance of the SRO 15 Specific enclosure recommendations are available directly from Electro Voice Secure the speaker to the baffle board just tightly enough to compress the speaker gasket Excessive tightening is not necessary as the compressible gasket will form an acousti cal seal with nominal pressure A second nut should be run on the mounting bolt and tightened down against the first nut to prevent its loosening during operation SPECIFICATIONS Nominal Impedance 8 16 ohms Power Handling Capacity Continuous Sine Wave 60 watts Pulsed Program 150 watts Peak 300 watts Peak to Peak 600 watts Voice Coil Diameter 2 inches Magnet Weight 4 Ib 10
4. mps Figure 2 Connection of two SRO 15 speakers in paralle 8 OHMS Figure 3 Connection of four SRO 15 speakers in series paralle CUSTOMER SERVICE SRO 15 speakers are packed to provide maximum pro tection well in excess of the shipping requirements of af the Interstate Commerce Commission If shipping damage does occur contact the carrier immediately requesting inspection and instructions or contact the dealer from whom the unit was purchased E ELECTRO VOICE INC Buchanan Michigan 268 Part No 533629 e A Subsidiary of Gulton industries Inc Litho in U S A
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