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The design goals called for the highest acoustic output capability with the highest fidelity in lightweight, compact enclosures that were easy to array. The development began with a clean sheet of paper and took an integrated approach. The individual loudspeaker drivers, horns, enclosures, rigging hardware and system configurations were designed from the ground up specifically for this high-performance application. The Xi-2181 is a manifolded, vented-box bass system utilizing two 457-mm (18-in.) woofers. The two woofers face each other in a manifold chamber at the center of the enclosure. This manifolding technique (U.S. Patent Number 4,733,749) increases the acoustic loading, resulting in increased low- frequency efficiency (at slightly above box tuning) and reduced distortion compared to conventional direct-radiating designs. The woofers were designed as part of the Xi-2181 development and represent a step forward in state-of-the-art loudspeaker design in terms of high acoustic output with low distortion and low power compression. Electro-Voice engineers developed a new technology dubbed Ring-Mode Decoupling (RMD™) to substantially improve clarity and intelligibility by reducing both linear and nonlinear resonance modes that color the sound. The low-frequency driver in the Xi-2181 is the EVX-180B. An improved version of the industry-standard EVX-180A high-excursion 467-mm (18-in.) woofer that has distinguished itself as an industry standard for high-power, low-frequency reproduction. During the X-Array™ development, the thermal conduction of the motor was improved and the suspension was redesigned, giving the EVX-180B even lower power compression and a longer mechanical lifetime. In the Xi-2181, the woofers are manifolded in a vented enclosure optimized for maximized output from 37-160 Hz with minimized distortion. Ring-Mode Decoupling, (RMD™), is a technique utilized and named by Electro-Voice to describe a process used to improve sound quality in loudspeaker systems. RMD™ offers a solution to a very fundamental problem. It has long been recognized that two different loudspeaker systems can sound different even though they both may be equalized to have the same frequency response. This difference is due to a variety of resonances, or ring modes that color the sound. Although this ringing may be very low in level compared to the program material, it is still audible. The source of these resonances may be mechanical or acoustical in nature, or a combination of both. In addition, they may be linear or nonlinear, resulting in their character changing with level. Furthermore, these ring-modes may be aggravated when multiple loudspeaker enclosures are assembled into arrays. The result is a coloration that decreases intelligibility and clarity, with the nature of that coloration varying with level. Often, the listener perceives that coloration as imbalance in the frequency response, and will attempt to electronically adjust the system to restore the spectral balance. However this electronic equalization has the negative effect of changing the program material itself. Ring-Mode Decoupling (RMD™) addresses mechanical resonances with mechanical solutions, and acoustical resonances with acoustical solutions. In the Xi-2181 development, RMD™ was applied at every level – to the individual low-frequency drivers, the low-frequency enclosure chambers and the interaction between multiple enclosures. The design process included, for example, the driver cone, suspension geometry and materials, enclosure geometry and materials, absorptive materials, etc. The result is a dramatic improvement in clarity and with a much more neutral sound (a lack of coloration) with the loudspeaker system maintain Xi-2181 Bass System Xi-2181 Bass System Xi-2181 Bass System ing its sonic integrity from the very-lowest sound pressure levels to the very-highest sound pressure levels. This means that the front-of-house engineer will not have to retune the EQ and level settings as the SPL is increased throughout the show. This also means that the sound-system performance will remain consistent in different array configurations and from venue to venue. The X-Array Install™ systems utilizes full top/bottom L-track. The durable Xi-2181 enclosure is constructed of 18-mm, 13-ply birch plywood and has a wear-resistant black, textured paint finish. The system is trapezoidal, forming an 18° wedge and includes a heavy-duty steel grille with a water-resistant charcoal-gray foam interlining. Applications The X-Array Install™ loudspeaker systems were designed for optimal performance in both concert-sound and permanent-installation applications where studio-monitor sound quality is required at concert-sound levels. The X-Array Install™ loudspeaker systems work well individually, in small arrays and in large arrays. The high acoustic output from these compact, lightweight systems provide the highest acoustic-power-toweight ratio, the highest acoustic-power-tofro...
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