User manual REVEL PERFORMA B15A SUBWOOFER

[. . . ] Revel Performa B15a Subwoofer 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 Please contact Customer Support for information about product shipments. Part No. 352990-001 | Rev A | 01/04 "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. [. . . ] If needed, follow the instructions that begin on the next page to adjust the spike footing. REVEL PERFORMA B15a Owner's Manual 9 B15a Figure 5. Continued on the next page. . . REVEL PERFORMA B15a 11 Owner's Manual PLACEMENT (Continued) However, if the room is not symmetrical, and you cannot make high-resolution measurements, only place the subwoofers together in one front corner. NOTE: Using high-resolution measurements, low frequency performance is often dramatically improved by placing two (or more) subwoofers in carefully chosen asymmetrical locations. · If you plan to use two B15a subwoofers and you cannot make high-resolution measurements (see System Optimization on page 21) place both subwoofers together in a front corner, side-by-side or stacked, or place a subwoofer in each of the front corners. (See Figure 7 and Figure 8 below). · For best results, place the B15a subwoofer near solid walls to reinforce bass response, and avoid windows which can rattle and transmit sound to the outside. Preferred Placement B15a(s) Figure 7. Preferred placement of two B15a subwoofers in a corner of a larger room. L Speaker R Speaker Listening Position (e. g. , on couch) Alternate Placement B15a B15a L Speaker R Speaker Figure 8. Alternate placement of two B15as in opposite corners. If the room is symmetrical and the L/R speakers and listening position are also symmetrical within the room, the B15a subwoofers can be placed in opposite corners Listening Position (e. g. , on couch) 12 REVEL PERFORMA B15a Owner's Manual REAR PANEL LAYOUT Figure 9. The B15a's rear panel layout shows locations of controls, as well as audio and power connectors. 1 EQ1~EQ3 Controls: Three parametric equalizers includes variable controls for FREQ. , BANDWIDTH, and LEVEL. Use these controls to modify the frequency response at three points, adjustable from 18 to 80Hz, across a bandwidth from 0. 1 to 1. 0 octaves, with level boost up to 6dB or cut down to -14. 5dB. Low-Pass/High-Pass Filters: The low-pass filter has an ON/OFF and 24/48dB slope switches, and variable controls for frequency, phase, and level. The high-pass filter is always on and has a variable frequency control and 12/24dB slope switch. Use the controls to precisely set a two-way crossover point from 30 to 80Hz, with symmetrical 24dB slopes or asymmetrical 24/12 or 48/12 dB slopes, and low-pass phase shift from 0 to 180 degrees. INPUT: Use stereo XLR (balanced) connectors or RCA (unbalanced) jacks to connect from preamplifier outputs, or front outputs of a multi-channel decoder. Both inputs are 0dBv (nominal)/+20dBv (maximum). AUX OUTPUT: Use stereo XLR (balanced) connectors or RCA (unbalanced) jacks to loop input audio signals to additional REVEL PERFORMA B15as (if present). Both outputs are 0 dBv (nominal)/+20 dBv (maximum). HIGH PASS OUTPUT: Use stereo XLR (balanced) connectors or RCA (unbalanced) jacks for (high-pass) connection to the main amplifier's inputs. Both outputs are 0dBv (nominal)/+20dBv (maximum). REVEL PERFORMA B15a Owner's Manual 13 2 3 4 5 REAR PANEL LAYOUT (Continued) 6 Fused power connector for (enclosed) detachable IEC power cord. If needed, replace the fuse with same type, as follows: · For 120V units, use a 10A fast-blow fuse. [. . . ] Just as is the case with subwoofers, use a modeling program or trialand-error measurements to determine the best locations Since the listening and loudspeaker locations are equally important, the trial-and-error process can be time-consuming. Remember that peaks (below the subwoofer crossover frequency) can be eliminated by the proper adjustment of the B15a subwoofer EQ controls, but most dips cannot be corrected. Therefore, the objective is to find the best locations that result in the minimum number and severity of dips. · · · 22 REVEL PERFORMA B15a Owner's Manual SOUND MEASUREMENT GUIDELINES · If you are using a modeling program, begin by placing the microphone at ear height at the recommended listening position, with the subwoofer placed at the calculated position. Choose a location that has been used for listening in the past. [. . . ]