Electro-Voice EVX-180B User Manual

General Product Description

The EVX-180B low-frequency transducer is designed for professional
sound reinforcement or studio monitoring applications that require
maximum output with low distortion.

The EVX-180B woofer provides unprecedented power capacity, linearity
and excursion, made possible by the HeatWick
total-thermal-engineering design. 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 100-mm (4-in.) diameter voice coil is longer than conventional
medium efficiency woofers to give additional power handling and virtually
eliminate dynamic-range power compression.

Additionally, a Flux Demodulation Device (FDD™) reduces distortion
in the critical mid-band by providing a “short circuit” effect to prevent
amplifier-signal modulation of the static magnetic field.

A ribbed, Kevlar® fiber composite cone with an extremely high
stiffness-to-weight ratio and exceptional strength gives the EVX-180B
increased resistance to cone collapse and deformation, without
sacrificing efficiency.

Architects’ and Engineers’ Specifications

The low-frequency transducer shall have a nominal diameter of 460
mm (18 in.), overall depth not greater than 198 mm (7.92 in.), and weigh
no more than 11 kg (25 lb). 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 part of the loudspeaker
frame. Both rings act to reduce flux modulation and provide a heat
transfer path from the outer diameter of the voice coil.

The voice coil shall be 100 mm (4 in.) in diameter and 20 mm (0.8 in.)
in winding length, and shall be made of edge-wound aluminum ribbon.
When centered in the magnetic gap, the voice coil shall produce a
force of not less than 21.9 newtons (tesla-ampere-meters) with a dc
current of 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, 100 to 800 Hz pink noise) shall be at least 96 dB. The
half-space reference efficiency shall be at least 3.0%. The usable
frequency response shall be 20 Hz to 2,000 Hz, and the nominal
impedance shall be 8 ohms. The rated power for the loudspeaker shall
be 1,000 watts continuous power.

The low-frequency transducer shall be the Electro- Voice® EVX-180B.

Directional Characteristics

The directional characteristics of the EVX-180B in the TL3512 256-liter
(9-ft³) 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 at the ISO
standard frequencies.

EVX-180B

18 Inch Low-Frequency

Reproducer

®

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 1 and 2, which indicate
6-dB-down beamwidth versus frequency and directivity factor,
respectively, for an EVX-180B in the TL3512 enclosure.

Electrical Connections

The EVX-180B 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 pair of twisted #15 AWG stranded or a pair of #14 AWG solid
conductors will fit. A positive electrical signal applied to the red (+)
terminal will displace the cone away from the magnet, thus producing a
positive acoustic pressure.

Recommended Enclosures

The most extended bass, lowest distortion and best control is usually
realized in properly designed vented enclosures. In such designs, the
vent, or port, actually provides the lowest octave of output. The vent is
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-180B at these frequencies is much reduced
compared to sealed or open-back enclosures, directly reducing harmonic
distortion and the possibility of speaker “bottoming.” The maximum output
is limited by either: (1) the long-term thermal power-handling capacity
or (2) the speaker’s maximum cone-excursion capability, whichever
occurs first.-excursion capability, whichever occurs first.

Figure 1. Beamwidth vs. Frequency

Specifications:

Power Handling:.................................................... 1000 watts continuous

Per AES2-1984/ANSI S4.26-1984,

50-500 Hz: ........................................................................... 600 watts

Sensitivity (SPL at 1 W/1 m), 100-800-Hz average: ...................... 98 dB

Impedance Response:

Minimum (Zmin): ..................................................................... 7 ohms

Nominal: ..................................................................................8 ohms

Distortion Response (on axis in standard baffle, 10% rated input
power):

Second Harmonic:

100 Hz: ......................................................................... -45 dB (0.6%)

1,000 Hz: ...................................................................... -41 dB (0.9%)

Third Harmonic:

100 Hz: ......................................................................... -41 dB (0.9%)

1,000 Hz: ...................................................................... -38 dB (1.3%)

Beamwidth (angle included by 6-dB-down points on polar
responses for octave bands of pink noise):

500 Hz: .......................................................................................... 90°

1,000 Hz: ....................................................................................... 70°

2,000 Hz: ....................................................................................... 45°

Physical Constants,

Effective Piston Diameter: ................................... 406.0 mm (16.0 in.)

Moving Mass (MMo): .............................................. 0.151 kg (0.333 lb)

Voice-Coil Winding Depth: ....................................... 20.3 mm (0.8 in.)

Voice-Coil Diameter: ............................................... 63.5 mm (2.5 in.)

Voice-Coil Winding Length: ........................................ 26.9 m (88.4 ft)

Top Plate Thickness at Voice Coil: ........................ 10.9 mm (0.43 in.)

BL Factor: ................................................................. 22.5 tesla meter

Thiele-Small Parameters (broken in),

fS : .............................................................................................. 29 Hz

VAS: ......................................................................... 416 liters (14.7 ft3)

QES: ............................................................................................... 0.29

O

: ...............................................................................................

MS

QTS: ............................................................................................... 0.27

RE: ......................................................................................... 5.0 ohms

η0: ............................................................................................... 3.4%

SD: .......................................................................... 0.122 m2 (189 in.2)

MMD: ...................................................................... 0.127 kg (0.280 lb)

LE : ........................................................................................... 1.6 mH

CMS: ................................................................................. .0.200 mm/N

RMS: ................................................................. 6.86 mechanical ohms

4.00

P

: .................................................................................. 600 watts

E(max)

1

: ........................................................................ 6.4 mm (0.25 in.)

X

MAX

2

X

: .......................................................................... 25 mm (0.98 in.)

lim

Connector Type:

Push Terminals for bare wires.

Polarity:

A positive voltage applies to the positive (red) terminal produces a
positive pressure at the front of the cone.

Additional Descriptive Information,

Magnet Weight: ............................................................ 3.2 kg (7.0 lb)

Magnet Material: ............................................................ Barium ferrite

Frame: ........................................................................ Cast aluminum

Frame Finish: ..................................................... Textured black epoxy

Plating of Steel Parts: .............................................................. E-coat

Voice-Coil Material: ............................................................ Aluminum

Voice-Coil Insulation:...................................... Polyimide 220°C rating

Voice-Coil Form: .................................................................. Polyimide

Back Cover: ............................. Black, advanced synthetic elastomer

Net Weight: ......................................................................... 11.3 kg (25 lb)

Optional Accessories:

SMH-1 mounting hardware kit

1. X

is the one-way peak excursion which produces 10% THD of

max

the current waveform when driven at fs.

2. Displacement limit is the one-way peak excursion which, when
exceeded, will cause physical damage to the drive mechanism.

Figure 2. Directivity Index vs. Frequency

)ni(:snoisnemiD

A2.81

B287.0

C881.8

D05.0

E24.7

F83.71

G8x182.0

Dimensions

USA 12000 Portland Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]
Canada 705 Progress Avenue, Unit 46,Scarborough, Ontario, Canada, M1H2X1,Phone: [phone], FAX: [phone]
Germany Hirschberger Ring 45, D94315, Straubing, Germany, Phone: [phone], FAX: [phone]
France Parc de Courcerin, Alle Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: [phone], FAX: [phone]
Australia Unit 23, Block C, Slough Business Park, Slough Avenue, Silverwater, N.S.W. 2128, Australia, Phone: [phone], FAX: [phone]
Hong Kong Unit E & F, 21/F, Luk Hop Industrial Bldg., 8 Luk Hop St., San PO Kong, Kowloon, Hong Kong, Phone: [phone], FAX: [phone]
Japan 5-3-8 Funabashi, Setagaya-ku, Tokyo, 156-0055 Japan, Phone: [phone], FAX: [phone]
Singapore 3015A Ubi Rd 1, 05-10, Kampong Ubi Industrial Estate, Singapore 408705, Phone: [phone], FAX: [phone]
Mexico Av. Parque Chapultepec #66-201, Col. EI. Parque Edo. Mex. 53390, Phone: [phone], FAX: [phone]
UK 4, The Willows Centre, Willow Lane, Mitcham, Surrey CR4 4NX, UK, Phone: [phone], FAX: [phone]
Africa, Mid-East 12000 Portland Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]
Latin America 12000 Portland Ave South, Burnsville, MN 55337, Phone: [phone], FAX: [phone]

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© Telex Communications, Inc. 11/2006
Part Number 38109-950 Rev B

For customer orders, contact the Customer Service department at

For warranty repair or service information, contact the Service

For technical assistance, contact Technical Support at 866/78AUDIO

Please refer to the Engineering Data Sheet for warranty information.

Specifications subject to change without notice.

U.S.A. and Canada only.

800/392-3497 Fax: [phone]

Repair department at 800/685-2606