Electro-Voice evx-155 eds Manual De Usuario
EVX-155
15 Inch Low-Frequency
Reproducer
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.
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
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 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.
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
amplifier signal modulation of the static magnetic field. To further increase
reliability, PROTEF
™
, a Teflon
®
based coating, is applied to the internal
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.
contact and electrically insulates the coil from the FDD™ and top plate
to guard against violent short-term power peaks.
A ribbed, Kevlar
®
fiber composite cone with an extremely high
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.
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.
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
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.
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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.
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.
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.
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.
(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.
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.
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.
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.
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
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PROTEF- is covered by U.S. Patent No. 4,547,632;
Teflon® and Kevlar® are registered trademarks of DuPont.