Electro-Voice S-181 Data Sheet

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Electro-Voice S-181 Data Sheet | Manualzz
 SPECIFICATIONS
Frequency Response, Measured At 10 Feet
on Axis, Swept '/1-Octave, Half-Space
Anechoic Environment (see Figure 1.
Curve shown has been normalized for 1
Watt/i Meter):
43-200 Hz
Low-Frequency 3-dB-Cown Point:
48 Hz
Usable Low-Frequency Limit (10-dB-down
point):
38 Hz
Half-Space Helerence Efficiency:
3.3%
Long-Term Average Power Handling
Capacity per EIA Standard AS-425A (see
Power Handling Capacity section):
400 watts
Maximum Woofer Acoustic Output:
16 watts
Sound Pressure Level at 1 Meter, 1 Watt
Input, Anechoic Environment, Sand-
Limited Pink Noise Signal, 50 to 200 Hz:
98 dB:
Dispersion Angle Included by 5-dB Down
Points on Polar Responses:
Essentially omnidirectional
Distortion, 0.1 Full Power Input,
Second Harmonic,
100 Hz: 1.0%
Third Harmonic,
100 Hz: 1.0%
Distortion, 0.01 Full Power Input,
Second Harmonic,
100 Hz: <1.0%
Third Harmonic,
100 Hz: <1.0%
Transducer Complement:
DL18mt
Recommended Crossover Frequency:
200 Hz
Impedance,
Nominal:
8 ohms
Minimum:
8.0 ohms
Input Connections:
Parallel '/a-in. phene ¡acks (allows
paralleling of multiple speakers)
Enclosure Materials and Colors:
Black carpet covered 3/s-in. Roadwood™
Parforated matal grille
enclosure Dimensions,
Height: 70.4 cm (27.7 in.)
Width: 53.8 cm (21.2 in.)
Depth: 58.1 cm (22.9 in.)
Shipping Dimensions,
Height: 71.1 cm (28.0 in.)
Width: 56.9 cm (22.4 in.)
Depth: 59.7 cm (23.5 in.)
Net Weight:
35.9 kg (79 Ib)
Shipping Weight:
40.5 kg (89 Ib)
DESCRIPTION
Tha Electro-Voica S-181 is a compact
subwoofer designed for sound rainforcement.
Tha single DL18mt 18-inch woofer is loaded
into an enclosure based upcn manifold
principles, yielding efficient performance in
the 50 Hz to 200 Hz frequency range. The
design creates a bandpass for the
subwoofer's output, providing a natural rollo
of 24 dB per octave at 200 Hz
The 3-d5-down point of the 5-181 subwoofer
is 48 Hz, and usable response (-19 dB) is 36
Hz. The enclosure venting provides control of
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FIGURE 1 — Axial Amplitude Response
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the wocfer's excursion at ihe lowest reg.
cies of the subwoofer s output. Excursión
minimized at 43 Hz, with the majority of th
output coming from ths vents. For most
efficient operation and protaction from
subsonic frequencies, a high sass filter at 32
Hz is recommended.
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The OL13mt woofer used in the S-181 is
idantical lo that used in tha MTL-4 and MTL-2
Manifoid Technology (U.S. Patant Nc.
4,733,749) low-frequency speaker systems,
widely Used in concert sound reinforcemant
The woofer was designed specifically for
manifolding. The nigh-powar, hign-excursion
drive of the DL18mt is augmented by two
exclusive Electro-Voice features, the Thermo
Inductive Ring, TIR™, and FROTEF™ coating
(U.S. Patent No. 4,547 532). The TIR acts as
a control drive inductance and, mora
importantly, providas a major neat-transfar
path from the top of the drive coll, reducing
thermal dynamic-range compressicn.
PROTEF™ is a Teflon®-basad coating apoliad
to the insida diameter of tha top plats to
physically protect the veice coil from rubbing
during viclent power peaks. Tha magnetic
structure is specially designed to both
concentrate magnetic flux in tha gap and
draw excess heat from the coil. Power
handling is 400 watts long-term and 1,500
watts peak, per ElA Standard RS-425A
MULTIPLE USE
The $-181 may be used in multiples to
increase acoustic output. A 6-08 increase in
maximum acoustic output occurs when two
speaker systems ara placed sida by side and
paralleled, yielding a 4-ohm load. For
oparation at very-low-frequencias, the woofer
power-handling capacity of & single system.
Efficiency is doubled by the increased cone
area to provide 3 dB more output, while the
doubled power capacity provides the potential
for an additional 3-dB gain in maximum
acoustic output.
Mutual coupling occurs when the center-to-
center distance between woofer is less than
one-half the wavelength. When the woofers
are spaced greater than one-half the
wavelength, the level increase is limited to the
3-dB input power increase. The woofer is
connected using one of the 1/4-inch phone
jacks marked “input.” A parallel woofer can be
connected using the other jack. Care must be
taken not to abuse the amplifier by connecting
impedances which are too low (see amplifier
specifications).
CROSSOVERS AND AMPLIFIERS
To optimize performance, the S-181 should
be used in conjunction with an active
crossover with a minimum slope of 12-dB-per-
octave and a crossover frequency in the
range of 100 to 200 Hz. The high power-
handling capability of the S-181 permits the
use of amplifiers with a rating of up to 800
watts rms into 8 ohms.
SPEAKER PROTECTION
When in the vented-box mode, the S-181, like
all other vented systems, experiences rapidly
increasing cone excursion below the box-
tuning frequency. The acoustic output is also
decreasing rapidly; therefore, it is sensible to
protect the 8-181 and maximize the power
output of the subwoofer by inserting an active
32 Hz high-pass filter with a slope of at least
12-dB-per-octave into the circuit. Such
subpass-band filters are found in many
commercially available crossovers and
equalizers including items manufactured by
Electro-Voice.
FREQUENCY RESPONSE
The 5-181 frequency response was meas-
ured at ten feet, using four-volt input in the EV
large anechoic chamber, and was measured
using a swept '/3-octave pink noise signal. No
external equalization was used.
ENCLOSURE CONSTRUCTION
Intended to be used as a portable speaker
system, the 5-181 is ruggediy constructed of
3/a-inch Roadwood™ (U.S. Patent No.
4,624,338). All joints are dado cut and the
cabinet is finished with a densely-woven,
abuse-resistant carpet that is both attractive
and highly durable. A steel grille protects the
woofer from damage. Large metal heavy-duty
corner protectors, firmly secured rubber feet,
and recessed handles complete the picture
and ensure that the S-181 speaker system is
ideally suited for a long and reliable life on the
road.
POWER HANDLING CAPACITY
To our knowledge, Electro-Voice was the first
U.S. manufacturer to develop and publish a
power test related to real-life conditions. First,
a random noise input signal is used because
it contains many frequencies simultaneously,
just like the real voice or instrument program.
Second, our signal contains more energy at
extremely high and low frequencies than the
typical program, adding an extra measure of
reliability. Third, the test signal includes not
only the overall “long-term” average or
“continuous” level — which our ears interpret
as loudness — but also short-term peaks
which are many times higher than the
average, just like the actual program. The
long-term average level stresses the speaker
thermally (heat). The instantaneous peaks
test mechanical reliability (cone and dia-
phragm excursion). Note that the sine wave
test signals sometimes used have a much
less demanding peak value relative to their
average level. In actual use, long-term
average levels exist from several seconds on
up, but we apply the long-term average for
several hours, adding another extra measure
of reliability. Specifically, the S-181 is
designed to withstand the power test
described in the EIA Standard RS-426A. The
EIA test spectrum is applied for eight hours,
To obtain the spectrum, the output of a white
noise generator (white noise is a particular
type of random noise with equal energy per
bandwidth in Hz) is fed to a shaping filter with
6-dB-per-octave slopes below 40 Hz and
above 318 Hz. When measured with the usual
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constant-percentage bandwidth analyzer ('/s-
octave), this shaping filler produces a
spectrum whose 3-dB-down points are at 100
Hz and 1,200 Hz with a 3-dB-per-octave slope
above 1,200 Hz. This shaped signal is sent to
the power amplifier set at 400 watts into 9,2
ohms EIA equivalent impedance, (60.7 volts
true rms). Amplifier clipping sels instantane-
ous peaks at 6 dB above the continuous
power, or 1,200 watts peak (121.4 volts
peak). This procedure provides a rigorous test
of both thermal and mechanical failure
models.
WARRANTY (Limited) —
Electro-Voice Speakers and Speaker
Systems (excluding active electronics) are
guaranteed for five years form date of original
purchase against malfunction due to defects
in workmanship and materials. If such
malfunction occurs, unit will be repaired or
replaced (at our option) without charge for
materials or labor if delivered prepaid to the
proper Electro-Voice service facility. Unit will
be returned prepaid. Warranty does not
extend tc finish, appearance items, burned
coils, or malfunction due to abuse or
operation under other than specified
conditions, including cone and/or coil damage
resulting from improperly designed enclo-
sures, nor does it extend to incidental or
consequential damages. Some states do not
allow the exclusion or limitation of incidental
or conseguenlial damages, so the above
exclusion may not apply to you. Repair by
other than Electro-Voice or its authorized
service agencies will void this guarantee. A
list of authorized warranty service agencies is
available from Electro-Voice, Inc., 600 Cecil
Street, Buchanan, MI 49107 (AC/615-695-
6831); and/or Electro-Voice West, 8234 Doe
Avenue, Visalia, CA 93291 (AC/209-651-
7777). This warranty gives you specific legal
rights, and you may alse have other rights
which vary from state to state.
Service and repair address for this product:
Electro-Voice, Inc., 600 Cecil Street,
Buchanan, MI 49107.
Specification subject to change without notice.
ELECTRO-VOICE, INC., 600 Cecil Street, Buchanan, Michigan 49107
MANUFACTURING PLANTS AT BB BUCHANAN sl BE NEWPORT, TH EE SEVHERVILLE, TN HE OKLAHOMA CITY, OK E GANANOQUE, ONT.
©llectro-Voice Inc. 1991
Part Number 531828 — 150

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