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/15 musical instrument speaker com-
bines reliabilitv with high efficiency. À 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
than 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/15 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
average power. À single SRO/15 will handle with ease
guitar amplifiers of up to 300 watts peak output, as
normally rated. So reliable is the SRO/15 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
эко 11 -INGH NUSIVAL
INSTRUMENT LOUDSPEAKER
5/16 Dia THAL, 4 HOLES EDUALLY
Te SPACED ON 147/16 B.C
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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: 8B — 16 ohms
Power Handling Capacity
Continuous Sine Wave: 60 watts
Pulsed Program: 150 watts
Peak: 300 warts
Peak-to-Peak: 600 watts
Voice Coil Diameter: 2% inches
Magnet Weight: 4 Ib. 10 Oz. Indox Ceramic
Magnet Structure: 16 165.
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 lbs.
*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 15
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 | E : 7
Use No. 18 or larger fixture wire to connect the two Red Black] Hed Black]
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 chm tap. If an array of four à ao +
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 amps. LEE Yo e
Red Black Red Black
Figure 2 - Connection of two
SRO/15 speakers in parallel
I A pf
BE ||
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 >
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.
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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