Electro Voice Speaker EVX 180B User Manual

EVX-180B  
18 Inch Low-Frequency  
Reproducer  
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.  
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.  
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.  
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.  
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.  
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.  
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.  
Figure 1. Beamwidth vs. Frequency  
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