Electro-Voice EVX-155 EDS User Manual

EVX-155

General Product Description

The EVX-155 low-frequency transducer is designed for professional
sound reinforcement or studio monitoring applications that require
maximum output with low distortion.

The EVX-155 woofer provides unprecedented power capacity, linearity
and excursion, made possible by the HeatWick™ total-thermal­engineering 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 100mm
(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. To further increase
reliability, PROTEF
diameter of the FDD™ and top plate. PROTEF™ lubricates any rubbing
contact and electrically insulates the coil from the FDD™ and top plate
to guard against violent short-term power peaks.

A ribbed, Kevlar
stiffness-to-weight ratio and exceptional strength gives the EVX-155
increased resistance to cone collapse and deformation, without
sacrificing efficiency. A rubber mounting flange gasket provides a
reusable seal for front or rear mounting, completely surrounding the
frame flange.

™

, a Teflon® based coating, is applied to the internal

®

fiber composite cone with an extremely high

Architects’ and Engineers’ Specifications

The low-frequency transducer shall have a nominal diameter of 381
mm (15 in.), overall depth not greater than 168 mm (6.61 in.), and weigh
no more than 10 kg (22 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 inner
diameter of the steel top plate and the lower aluminum ring shall be
Teflon® coated.

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 20.4 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 98 dB. The half-space reference
efficiency shall be at least 4.3%. The usable frequency response shall
be 30 Hz to 1,800 Hz, and the nominal impedance shall be 8 ohms. The
rated power for the loudspeaker shall be 1,000 watts continuous program
power.

The low-frequency transducer shall be the Electro-Voice® EVX-155.

1

Directional Characteristics

The directional characteristics of the EVX-155 in the TL606A 90-liter
(3.2-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.

15 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-155 in the TL606A enclosure.

Electrical Connections

The EVX-155 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-155 at these frequencies is much reduced
compared to sealed or open-back enclosures, directly reducing harmonic
distortion and the possibility of speaker “bottoming.” Several specific
vented-enclosure recommendations are shown on the previous page.
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.

Figure 1. Beamwidth vs. Frequency

EVX-155/TL606A In a 90-Liter (3.2-ft³) Enclosure

1

PROTEF- is covered by U.S. Patent No. 4,547,632;

Teflon® and Kevlar® are registered trademarks of DuPont.

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: ................................... 318.0 mm (12.5 in.)

Moving Mass (MMo): .............................................. 0.069 kg (0.152 lb)

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

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

Voice-Coil Winding Length: ...................................... 20.3 m (0.80 in.)

Top Plate Thickness at Voice Coil: .......................... 8.9 mm (0.35 in.)

BL Factor: ................................................................. 20.4 tesla meter

Thiele-Small Parameters (broken in):

fS : ........................................................................................... 35.4 Hz

VAS: ......................................................................... 220 liters (7.77 ft3)

QES: ............................................................................................. 0.216

O

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

MS

QTS: ............................................................................................. 0.208

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

η0: ............................................................................................. 4.32%

SD: .......................................................................... 0.079 m2 (123 in.2)

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

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

5.56

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

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

R

MS

P

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

E(max)

1

X

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

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: .............................................. Bright Cadmium

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

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

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

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

Net Weight: ............................................................................ 10 kg (22 lb)

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

EVX-155/TL606A In a 90-Liter (3.2-ft³) Enclosure

)ni(:snoisnemiD

A82.51

B585.0

C881.8

D05.0

E17.6

F06.41

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]

www.electrovoice.com  Telex Communications, Inc.  www.telex.com

© Telex Communications, Inc. 11/2006
Part Number 38109-949 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