Electro-Voice EVX-1800 User manual

Electro-Voice EVX-1800 User manual
 SPECIFICATIONS
Power Handling:
1500 watts continuous program
Voice Coil Diameter:
102 mm (4 in.)
Sensitivity (SPL/1 W/1 M),
100-800-Hz Average:
95 dB
Impedance,
8 ohms
Frequency Response:
20-1 kHz
Highest Recommended Crossover:
200 Hz
Magnet Assembly Weight:
11.3 kg (25 Ibs)
THIELE-SMALL PARAMETERS
fe: 20 Hz
R,: 5.0 ohms
Que: 0.264
Que: 7.53
Que: 0.274
Vas: 767 L (27 cu. ft.)
Sp: 0.125 sq. m (193 sq. in.)
Xmax: 15 mm (0.60 in.)
Displacement Limit:
56 mm (2.2 in.) peak to peak
No: 2.16%
Pg: 850 watts EIA RS-426A
790 watts continuous sine wave
DESCRIPTION
The EVX-1800 very-low-frequency transducer
is designed for professional sound reinforce-
ment or studio monitoring applications that
require maximum subwoofer output with
extremely low distortion. EVX-1800 provides
unprecedented high power capacity and linear
cone-excursion ability made possible by the
HealWick™ total-thermal-engineering design
and the revolutionary Internal Tandem
Disk™ voice-coil suspension. The result is low-
frequency impact and “punch” that is simply
not provided by traditional professional
designs. The 18-inch EVX-1800 has more
output capability than any high-performance
18-inch wooler,
The proprietary HeatWick design actually
“wicks” heat away from the voice coil,
significantly increasing power handling and
long-term reliability. A special frame extension
and elongated pole piece provide a metal
surface with close proximity to the entire length
of the voice coil, providing a major heat-transfer
path. Also, the 102-mm (4-in.) diameter voice
coil is 50% longer than conventional “long-
throw" coils, to give additional power handling
and virtually eliminate dynamic-range power
compression.
The EVX-1800 Internal Tandem Disk suspen-
sion provides the highest excursion capability
(over 2 inches peak-to-peak) of any woofer, for
greatly increased low-bass output and the
lowest distortion possible at high levels. The
unique fiberglass-epoxy suspension is formed
from concentric cantilever disks attached
inside the voice-coil former. This suspen-
sion/voice-coil assembly is fixed to the pole
piece, with cone excursion allowed by the
flexure of the suspension disks. Careful choices
of materials and disk geometry allow high radial
rigidity to reduce the risk of voice-coil “rubs”
and provide higher reliability than conventional
cloth-spider suspensions.
Additionally, a Flux Demodulation Device
(FDD™) reduces distartion in the critical
midband by providing a “short circuit” effect to
prevent modulation of the static magnetic field.
To further increase reliability, PROTEF™, a
Teflon® -based coating, 1s applied to the inner
diameter of the top plate and FDD. PROTEF
Electro:Voice”
a MARK IV company
СТО ТТ
EEE O AS PENE
OO UN O
eiii me НИ НТ! АННО RE
MAN O EL NO
Ti AR a
Le [5]
pl AS TEA
FIGURE 1
Axlal Frequency Response, 1 Walt/1 Meter
12 Cuble Foot Enclosure Tuned to 27 Hz
EVX-1800
18-Inch
Very-Low-Freguency
Reproducer
lubricates any rubbing contact and electrically
insulates the coil to guard against violent short-
term power peaks.
A ribbed carbon-fiber composite cone with an
extremely high stiffness-to-weight ratio gives
the EVX-1800 increased resistance to cone
collapse and breakup, without added
efficiency-robbing mass, as compared to
conventional paper designs
FEATURE HIGHLIGHTS
® HeatWick™ Design
Provides advanced thermal engineering
to "wick” heat away from the voice-coil
for increased power handling and
reliability,
® Internal Tandem Disk™
Voice-coil suspension provides a 50-mm
(2-in.) peak-to-peak excursion for
unprecendented low-bass output. High
radial rigidity keeps coil centered in the
gap at explosive volumes,
® Extended-Length 102-mm (4-in.)
Voice Coil
Has nearly twice the surface area of any
other woofer to virtually eliminate
dynamic-range power compression.
® Carbon-Fiber Composite Cone
For added protection against cone
collapse and breakup, without adding
efficency-robbing weight.
e Rubber Mounting-Flange Gaskel
Provides a reusable seal for front or
rear mounting, completely surrounding
the frame flange
e 1,500-Watl Continuous Program
Power capacity, without efficiency
sacrifice, for extremely high output with
low distortion
ra ui
mm
ENT
SPL in de
-. BEAMWIDTH IN DEGREES
лота) A E
FIGURE 2A — EVX-1800 Single-
Driver Low-Frequency Performance:
«BOB ¥en
| влет 800/TL3512 in a 255-L. (9. oe
je
Ea
Hz tuning- - -
30 Hz tuning — — — —
Hz
M DC Ea e eg TN ea TE ] us X a + >
FREQUEMCT y HERTZ
223-L (8-ft?) Enclosure
SPL in d8
FREQUENCY IN HERTZ у
FIGURE 2D — EVX-1800
Multiple-Driver Low-Frequency
Performance: 2 Drivers in a.
—566-L (20-ft3) Box or 2
283-L (10-ft3) Boxes in Close
Proximity Tuned to 25 Hz
200 uma 2000
FREQUENCY на
: FIGURE 3- a Beamwidth vs.
hize
- (ROOM
Si ries
. A 1708 “2000 -
FREQUENCY IN HERTZ ra e
“FIGURE 5 — Theoretical Low-Frequency :
Maximum Acoustic Output vs. Frequency
‚| 283-L (10-ft3) Enclosure Tuned to 30 Hz
FIGURE 2B — EVX-1800
Single-Driver Low-Frequency
Performance: 283-L (10-ft3) Enclosure
ALCALA "
| DIRECTIVITY INDEX
Di (dB)
se E th
ty Te
50 Hz
100 Hz—
800 Н:— —
1500 Hz---
Hz Hz
30 Hz tuning 25 Hz tuning
Hz Hz
Fa Ba Lig Fa 5000 Eo — 5 = *5 To Te well TA вы A ale
FREQUENCY IN HERTZ FACOUE hc éd HERTZ
FIGURE 2C — EVX-1800 Single-
Driver Low-Frequency Performance:
336-L (12.5-f13) Enclosure
*
*
SPL in dB
FREQUENCY IN HERTZ
FIGURE 2E — EVX-1800
Multiple-Driver Low-Frequency
Performance: 4 Drivers in a
1132-L (40-ft3) Box or 4
283-L (10-ft3) Boxes in Close
Proximity Tuned to 22 Hz
à = = 20 » _ = 100.200 500 1000 2000 S000 10000 20000
a ; FREQUENCY IN HERTZ... ;
= FIGURE 4 — Directivity Index \ vs. Frequency
— EVA 1800/TL3512 in a 255-L (9. 0-1t:) Enclosure
0°
330° к 30°
60°
90°
120°
150°
180°
… FIGURE 6 — Polar Response
DIRECTIONAL PERFORMANCE
The directional characteristics of the
EVX-1800 in the TL3512 256-L (9-13) vented
enclosure were measured By running a set
of polar responses in EV's large anechoic
chamber. The test signal was octave-band-
limited pseudo-random pink noise centered
al the ISO standard frequencies.
The curves show horizontal (side-to-side)
dispersion when the enclosure s long axis is
vertical. The vertical (up-and-down) polar
responses deviate only slightly from the
horizontal responses due to box geometry.
Typical data is provided in Figures 3 and 4
which indicale 6-dB-down beamwidth versus
frequency and directivity factor, respectively,
for an EVX-1800 in the TL3512 enclosure,
POWER HANDLING TEST
To our knowledge, Electro-Voice was the first
U.S. manufacturer to develop and publish a
power test closely related to real-life
conditions. First, we use a random noise
input signal because it contains many
frequencies simultaneously, just ike real voice
or instrument program. Second, our signal
contains more energy at extremely high and
low frequencies than typical actual program,
adding an extra measure of reliability. Third,
the test signal includes not only the overall
“long-term averge” or “continuous” level —
which our ears interpret as loudness — bul
also short-duration peaks which are many
times higher than the average, just like actual
program. The long-term average level
stresses the speaker thermally (heat). The
instantaneous peaks test mechanical reliability
(cone and diaphragm excursion).
Specifically, the EVX-1800 is designed to
withstand the power test described in 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 constant-percentage-bandwidth
analyzer (one-third octave), this shaping filter
produces a spectrum whose 3-dB-down
points are at 100 Hz and 1200 Hz with a
3-dB-per-oclave slope above 1200 Hz. The
signal has a 6-dB crest factor. This
procedure provides a rigorous test of both
thermal and mechanical failure modes.
The EVX-1800 has also been power tested
with a two hour sine wave at minimum
impedance so that competitive comparisons
can be made using consistent methods.
Continuous program power is defined as
3-dB above (double) the continuous sine-
wave power rating.
RECOMMENDED ENCLOSURES
The most extended, lowest distortion and
best controlled bass periormance 15 usually
realized in properly designed vented
enclosures In such designs, the vent, or
port, actually provides the lowest octave ol
output. The vent 1s driven to full acoustic
output by a relatively small motion of the
speaker cone itself, acting through the air
contained within the enclosure. The
excursion of the EVX-1800 at these frequen-
cies is much reduced compared to sealed or
open back enclosures, directly reducing
harmonic distortion and the possibility of
speaker “botioming.” Several specific
vented-enciosure recommendations are on
the previous page. Alternate tunings are
given so that designers can tailor the low-
frequency response to their specific needs.
Figure 5 shows the maximum acoustic
power output versus frequency. The
maximum output is imited by either. 1) the
thermal, power handling capacity, or, 2) the
Speaker's maximum Cone excursion
capabilities, whichever occurs first. Also
provided are recommended enclosures for
multiple driver configurations.
STEP-DOWN OPERATION
For extended low-frequency operation, the
vent area can be reduced by one-half,
thereby tuning the enclosure to the "step
down” mode. In step-down, the tuning
frequency 1s reduced by half an octave (a
factor of 0.7). The resulting alignment is then
equalized for flat response. This procedure
results in one-half octave lower bass without
any excursion penalty.
ARCHITECTS' AND ENGINEERS’
SPECIFICATIONS
The low-frequency transducer shall have a
nominal diameter of 460 mm (18 in.), overall
depth not greater than 211 mm (8.42 in),
and weigh no more than 14 kg (31 Ib)
The frame shall be made of die-cast
aluminum to resist deformation. The
magnetic assembly shall have an extended
pole-piece to reduce inductive variances with
excursion, and provide a symmetrical
magnetic field at the voice coil gap. Two
aluminum rings shall encircle the pole piece
above and below the magnetic gap, and
shall have internal diameters concentric with
the internal diameter of the steel top-plate.
The upper ring shall be par of the
loudspeaker frame. Both rings act to reduce
flux modulation and provide a heat-transter
path from the outer diameter of the voice
coil. The inner diameter of the steel top plate
and the lower aluminum ring shall be
Teflon® coated.
The voice coil shall be 102 mm (4 in.) in
diameter and 355 mm (1.4 in.) in winding
length, and shall be made of edgewound
aluminum ribbon. The voice coil shall be
suspended тп the magnetic gap by two
spiders. The spiders shall be attached to the
inside diameter of the coil form and center of
the pole piece. The spiders shall be made of
FRP G-10 or equivalent. The voice coil shall
produce a force of not less than 20 3
Newtons (Tesla-Ampere-Meters) with à dc
current ot 1 ampere
Performance specifications of a typical
production unit shall be as follows. Measured
sensitivity [SPL at 1 m (3.3 ft.) with 1-watt
input, averaged between 100-800-Hz pink
noise] shall be at least 95 dB. The half
space reference efficiency shall be at least
2.1%. The usable frequency response shall
be 15 Hz to 1500 Hz, and the nominal
impedance shall be 8 ohms. The rated
power for the loudspeaker shall be 1500
watts normal program material.
The low-frequency transducer shall be the
Electro-Voice EVX-1800.
AES SPECIFICATIONS
The following specifications are in accor-
dance with the "AES Draft Recommended
Practice for Specification of Loudspeaker
Components Used in Professional Sound
Reinforcement Systems — 1983."
Dimension and Weight,
Outer Diameter:
46 cm (18.3 in.)
Depth:
21 cm (8.46 in)
Bolt Hole Diameter:
TA mm (0.281 in)
Net Weight:
14 kg (31 Ib)
Shipping Weight:
16.8 kg (37 Ib)
Mounting:
The EVX-1800 may be front- or rear-mounted
agains! either surface of the mounting flange
and requires a 422-mm (16.6-in.) diameter
cutout and a 438-mm (17.25-in.) bolt circle
Normal fasteners up to 6 mm (Va in.) will fit
through the eight holes in the frame. Front
mounting is simplest using the optional
SMH-1 speaker mounting kit.
Electrical Connections:
The EVX-1800 is fitted with a pair of chrome-
plated frame-mounted connectors with color-
coded ends. Electrical connection is made by
pushing down, inserting wire completely
through the rectangular slot and releasing
pressure, One conductor of #9 AWG stranded.
#8 AWG solid, a par of twisted #15 AWG
stranded or a par of #14 AWG sold conduc:
tors will fit. A positive electrical signal applied
lo the red (+) terminal will displace the cone
away from the magnet, thus producing a
positive acoustic pressure
DDITIONAL DESCRIPTIVE INFORMATION:
Voice-Coil Material:
Aluminum
Voice-Coil Insulation:
Polyimide, 220 degree C rating
Coil Form:
Polyimide
Magnet Frame:
Cast aluminum
Thermal Rise after Power Test:
B82 degrees C (147 degrees F)
Recommended Enclosures:
6-15 cubic foot (170 L-424 |)
Magnet Plating:
Bright cadmium
*hysical Constants,
Effective Piston Diameter;
398 (15.7 in.)
Total Moving Mass:
0.155 kg
Voice-Coil Winding Depth:
36 mm (1.4 in.)
Top Plate Thickness at Voice Coil:
8.9 mm (0.35 in.)
Z min:
7 ohms
BI Factor:
20.3 Tm
"hiele-Small Parameters:
fe: 20 Hz
Rg: 5.0 ohms
Que: 0.264
Qe: 7.53
Que: 0.274
Vas: 767 L (27.3 cu. ft.)
Sa: 0.125 sq. m (194. sa. in.)
Xmax: 15 mm (0.60 in.)
Mg: 2.16%0
Pg: 850 watts EIA RS-426A
750 watts continuous sine wave
lesponse in Standard Baffle
FREQUENCY A HEAT
NOTE: AES requires a large, planar baffle
or this test, WHICH IS INTENDED TO
SHOW SMOOTHNESS AND OFF-AXIS
IESPONSE, NOT BASS RESPONSE. This
1as proven to be inconvenient and
srohibitive, due to its size. Here, we have
zhosen our lab standard low-diffraction
| 2-cubic-foot test enclosure, which will
jemonstrate the same characteristics as the
“AES standard baffle."
Distortion Response
8.5 WATTS
85 WATTS
Impedance Response:
= © = ча лик
MULTIPLE DRIVER APPLICATION:
When used in arrays and multiple driver
bass boxes, the system Thiele-Small
parameters can be synthesized as follows.
This data should be used for multiple-driver
configurations.
Two (2) Drivers:
f,: 19.5 Hz
О: 0.274
Vas! 53.8 cu. ft. (1522 L)
Four (4) Drivers:
f.: 18,7 Hz
Q,.: 0.282
Va; 109.0 cu. ft. (3085 |)
vesigners will find the followng equation
useful in tuning their enclosures:
_ Sy
37 x WYN RE
L — Kr
Vv
Where:
Ly = Length of vent or thickness of
baffle, for hole in baffle,
in inches
Sy = Area of vent in square inches
Vg = Volume of box in cubic feet
la = Box tuning in Hz
r = Radius of vent in inches
K = 1.7 for a hole in baffle 1.5 for a
tube in inches
IMPORTANT NOTE ON GRILLE COVERS:
Because of the extremely high excursion
capability of the EVX-1800 it is important that
users leave at least 1.1 inch clearance
between the front gasket and a grille cover. A
suggested grille cover that will provide this
protection is Middle Atlantic Audio part -
# SGP-EV-18 or equivalent.
WARRANTY (Limited)
Electro-Voice Speakers and Speaker Systems
(excluding active electronics) are guaranteed
for five years from date of original purchase
against malfunction due to delects in
workmanship and materials. I! such maifunc-
tion 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
lo 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 enclosures, nor does it extend to
incidental or consequential damages. Some
states do not allow the exclusion or limitation
of incidental or consequential 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/616-695-5831); Electro-Voice, Inc.,
3810 148th Avenue N.E., Redmond,
WA 98052 (AC/206-881-9555); 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 also have other rights which vary
from state to state.
Service and repair address for this product:
Electro-Voice, Inc., 600 Cecil Street,
Buchanan, Michigan 49107.
Specifications subject to change
without notice.
lee ll ELECTRO-VOICE. INC.. 600 Cecil Street Buchanan. Michloan 49107 |
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