User manual REVEL M22 REV 0

[. . . ] Revel Performa M22 Loudspeaker Owner's Manual ® TM 3 Oak Park, Bedford, MA, 01730-1413 USA | Telephone: 781-280-0300 | Fax: 781-280-0490 | www. revelspeakers. com Customer Support: Telephone: 781-280-0300 | Sales Fax: 781-280-0495 | Service Fax: 781-280-0499 Please contact Customer Support for information about product shipments. Part No. 350548-001 | Rev 0 | 12/03 "Revel, " "Performa, " and the Revel logo are registered trademarks of Harman International Industries. patent numbers and other worldwide patents issued and pending. This document should not be construed as a commitment on the part of Harman Specialty Group. The information it contains is subject to change without notice. [. . . ] Gold-plated binding posts accommodate heavy speaker cables, while separate Placement Compensation and Tweeter Level controls provide precise balance to compensate for less-than-ideal loudspeaker placement and listening room acoustics. WOOFER PORT Enhances low-frequency extension. Computer-optimized internal and external flares minimize distortion resulting from air turbulence. Note The grille can also be cleaned using a vacuum with a soft-bristled brush attachment. INPUT PANEL The numbers in Figure 4 at the top of the next page correspond with the numbered items in this section. CAUTION To prevent cabinet damage, do not use a cloth made with steel wool or metal polish to clean the cabinet. To prevent possible transducer damage, do not apply furniture polish directly to the cabinet. 1. Placement Compensation Control Optimizes the M22's response to different loudspeaker placements. Refer to the Loudspeaker Placement section that begins on page 10 for more information. · Select the Flush Mounted setting if the M22 is placed in a bookcase or wall unit or if the M22 is located less than 2 feet (0. 61m) from walls and other objects. Select the Stand Mounted setting if the loudspeaker is placed on a stand (such as the optional pedestal stand). · 8 Figure 4: Rear View The numbers in Figure 4 (shown here) correspond with the numbered items in the Input Panel section that begins below. 2. Tweeter Level Control Alters tweeter output levels by -1, -. 5, 0, +. 5, or +1dB. 3. Move the M22s closer to the corners or walls of the listening room to increase bass response. Set the Placement Compensation control to Stand Mounted if the M22 is is placed on stand such as the optional Performa Pedestal 22 stand shown in Figures 5 and 6 on the previous page. For best results, align the tweeter with the listener's ears as shown in Figure 6, with the front of the M22 facing toward the listener's head. Refer to the Performa Pedestal 22 Assembly Instructions that are included with the optional pedestal stand for additional information. · Set the Placement Compensation control to Flush Mounted if the M22 is placed in a bookcase or wall unit as shown in Figure 7 at the bottom of the previous page. LISTENING ROOM ACOUSTICS · Listening rooms have a profound impact on sound, particularly at lower frequencies. In fact, listening rooms can dominate sounds below about 400Hz. Ideally, listening rooms would include optimized dimensional ratios to minimize the effects of room resonances. But in reality, most listening rooms are not designed to enhance loudspeaker performance. The interaction between loudspeakers and listening rooms is complex, depending on two important determinants that affect the loudspeaker and the listener. Surfaces and other boundaries often cause large peaks and dips in lowfrequency response. These peaks and dips often range 12dB or more. Standing waves (also known as room modes or resonances) interact with both the loudspeaker and the listener, resulting in large frequency response errors. Unfortunately, there is no simple solution that considers both factors. Even computer software programs that examine both factors may not calculate proper primary listening position or loudspeaker placement values. In most cases, proper selection of the primary listening position combined with proper placement of the loudspeaker can still result in superior performance at lower frequencies. The difference between superior and inferior results is often just a small adjustment of the primary listening position or loudspeaker placement. [. . . ] Conservatively-rated specifications indicate moderate sensitivity, meaning that a massive power amplifier is not required to drive Revel loudspeakers to reasonable volume levels in large listening spaces. Indicates whether the loudspeaker presents a "difficult" or "easy" load on the associated power amplifier. Combined with moderate phase angles, a minimal impedance specification of 4. 8 allows any reasonably designed power amplifier to drive Revel loudspeakers. Indicates the acoustical characteristics of the filter network. [. . . ]