User manual ELECTRO-VOICE 637S DATASHEET

[. . . ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 The EVID C8. 2HC ­ Wide spectrum Pattern Control in a Compact Package. . . . . . . . . . . 3 The EVID 4. 2 and 8. 2 ­ Full Range Models with Punch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 The 10. 1 - Finally a Compact True Ceiling Subwoofer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] An EVID system "pays for itself" very quickly. Locations with the highest sales per square foot are the ones who are most careful about sound quality, music programming, and customer satisfaction. VALUE OF PREMIUM PERFORMANCE: People are getting used to better quality sound in their homes, cars and entertainment spaces. Their expectations have grown for better quality sound in retail, office and other background music spaces. Using premium quality audio systems can help increase sales through improved customer perceptions of the business's products or services. It has now been well established that the quality of music in commercial spaces greatly impacts the customer's perceptions of the products or services of the establishment. High quality music also increases the friendliness and job satisfaction of the employees. A Unique Solution to an Age Old Problem High ceilings and reverberant rooms have long been the downfall of many ceiling based distributed sound installations. The inherent desire for wide dispersion in smaller acoustically dead spaces works against the use of ceiling speakers in larger rooms with reverberant characteristics and higher ceilings. Until now there has not been a cost effective solution that combines good quality full range audio with useful pattern control. Some ceiling products attempted to have pattern control at the high frequencies but this proved largely ineffective at the critical voice spectrum of the audio range. The result was a speaker that had the same poor intelligibility problems when used in reverberant room as conventional ceiling speakers. The real solution to the problem requires that directionality must exist for the critical mid frequencies as well as the upper end of the spectrum. In addition to the spacing pattern, the designer must choose between three density types, designated respectively as edge-to-edge, minimum overlap and center-to-center. The greater the overlap, the more uniform the coverage -- and the higher the cost. Budgetary constraints tend to favor sacrificing density, so the optimum center-to-center configuration is, in practice, the least common of the three. The illustration below shows these various layout patterns. Ceiling Systems ­ Size vs. Coverage In the past system designers usually specified 8-inch cone loudspeakers for distributed overhead systems, at least in part because they represented the traditional choice. The EVID systems however allow for far more flexible options. In many cases, you can achieve excellent results -- at a significant savings -- by using 4-inch elements. This is true in jobs that do not require extended low-end response or high SPL levels. 4-inch elements such as used in the EVID the C4. 2 offer wider dispersion to allow for fewer speakers to be employed in the job. For example, due to its smaller cone diameter, the C4. 2 exhibits significantly wider dispersion (130 degrees) than the C8. 2 (110 degrees) at the -6 dB points. The effect of this characteristic on an overhead system is indicated in the illustration below. [. . . ] The grille is powder coated steel and is easily painted as well. What finishes are the EVID models available in? The EVID ceiling speaker lineup is available only in white. They are pre-coated to eliminate fading, improve appearance and provide an easy to paint surface. The installation requires no logo is visible on the speaker. What can I do? In this situation it is easy to "white out" the logo so that is becomes nearly impossible to see. Since the design of the EVID line is attractive and subtle, these requests will generally be quite rare. Can I use the EVID C10. 1 outdoors? In general it should be OK. [. . . ]