User manual REVEL F52 REV 0

[. . . ] Revel Performa F52 Loudspeaker ® TM Owner's Manual 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 "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. Harman Specialty Group assumes no responsibility for errors that may appear within this document. Part No. [. . . ] Standing waves (also known as room modes or resonances) interact with both the loudspeaker and the listener, resulting in large frequency response errors. 12 REVEL Performa F52 OWNER'S MANUAL Acoustic Treatment Materials The F52 features high-order filters at 220Hz and 2. 3kHz that optimize loudspeaker on-axis and off-axis response, minimizing degradations that occur in overly "live" rooms. Placing minimal acoustic treatment materials at primary reflection points will reduce these distortions even further. Ideally, acoustic absorbers should be placed at the first reflection points on the front and side walls and either acoustic absorbers or diffusers should be placed at the first reflection point on the rear wall. Because the listener's eyes and ears are on the same plane, the "mirror method" is an accurate determinant of critical reflection points. This method can be used to determine reflection points for side walls, rear walls, front walls, and even the ceiling. Applying acoustic treatment materials to the side walls is most important, followed by the front wall, rear wall, and ceiling. To determine reflection points using the mirror method: 1. Once the F52s have been placed, sit in the primary listening position and ask another person to slide a mirror along the listening room walls. Note the locations at which the person sitting in the primary listening position can see either F52. Be sure to look for both F52s in the reflection on each room boundary. These are reflection points that require acoustic treatment materials. If acoustic treatment materials are not available, hanging a rug over the reflection points will help reduce degradation in overly "live" rooms. Carpeting the floor between the loudspeakers and the primary listening position and placing irregular surfaces such as bookcases at first reflection points will also help minimize strong reflections. ADJUSTABLE SPIKES When shipped, adjustable spikes are attached to the bottom of the cabinet for optimal stability, accommodating installations on tile, hardwood, and carpeted floors. The F52 is shipped with spikes attached as shown on the left side of Figure 6 (next page), with the round end protruding from the cabinet. The protective cap is placed over the round end to protect tile and hardwood floors. Note When moving the F52, avoid dragging it across the floor. If the F52 is placed on a carpeted floor, the spikes should be adjusted as shown on the right side of Figure 6 (next page), with the sharp end protruding from the cabinet. If needed, follow the instructions that begin below to adjust the spikes. To adjust the spikes: 1. Place the F52 on its side on a soft towel or carpeted floor. Remove the protective cap from the round end of the spike. Rotate the locking ring counterclockwise to detach it from the spike. Rotate the spike counterclockwise to remove it from the cabinet. REVEL Performa F52 OWNER'S MANUAL 13 Adjustable Spikes (continued) 9. Repeat these steps to adjust the spikes on the other F52. 5. Rotate the spike clockwise into the cabinet, round end first, as shown on the right side of Figure 6 (below). CAUTION 6. [. . . ] 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 3. 5 allows a reasonably designed power amplifier to drive Revel loudspeakers. Indicates the acoustical characteristics of the filter network. [. . . ]