User manual INFINITY CASCADE TWELVE

[. . . ] CASCADE TM Compact Powered Subwoofer MODEL TWELVE Owner's Guide (230V) ENGLISH IMPORTANT SAFETY PRECAUTIONS READ FIRST! Attention should be drawn to the environmental aspects of battery disposal. Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper operating condition. When positioning, or moving this product ensure that is lifted rather than dragged across any floor/ mounting surface. This will avoid any damage to the floor/ mounting surface. Attention!Products and/or product feet constructed of rubber or plastics may, in seldom cases, react chemically and discolor treated or non-treated wooden surfaces if positioned without protection. [. . . ] Watch for peak readings. The peak reading may be no more than a brief flash. Readjust the subwoofer's Level control 5 until the peak level observed is 0dB without triggering the overrange indication. RSLM indicating the correct system level to begin tests (­10dB) When finished, press Pause II. Performing Low-Frequency Measurements When you have completed this adjustment, press Pause II. For the following steps, you will need a Measurement Template and a pencil. Setting the Subwoofer Test Level Each of the following test tracks is about one minute long. This is normally much longer than required. This step will set the subwoofer levels for measurement purposes. The objective is to scale the subwoofer's output to make full use of the RSLM indicator range. Scaling is optimum when a 0dB reading is observed on the highest peak without triggering the over-range indication. controls, 9, A and B, should be set to fully clockwise positions, and all measurements should be conducted with their level controls in this position. Confirm this setting before you begin this test. The Level control 5 should be set to the mid position. Figure 6. Measurement Template Cue Track 3 and Pause II. Track 3 continuously steps through all subwoofer test tones for approximately 1 minute. Each tone will play just long enough for the RSLM to give a stable reading. To get accurate measurements, it is necessary to play the Cascade Model Twelve quite loud. The 0dB indication is about 94dB. At this level, frequencies below 100Hz can cause doors, windows, furnishings and other objects in the room to vibrate. This frequently results in clearly audible buzzes and/or rattles that come and go as each test tone plays. If you hear a buzz or rattle during this test, it is highly recommended that you locate the source and eliminate its effects. This is actually a valuable room-diagnostic tool. 7 CASCADE MODEL TWELVE Each of the following tracks produces a low-frequency test tone. The range of these tests is from 100Hz down to 20Hz. The frequency of each test is announced before it begins. The first test is the highest frequency (100Hz); therefore, you will be marking the template from right to left. Each frequency point is listed across the bottom of the Measurement Template (this is called the X-axis). See Figure 6 on the previous page. The vertical scale on the left side of the template indicates relative level, in dBs (the Y-axis). The template's vertical scale matches that of the RSLM bar graph. From now on, you will want to keep your CD player's remote control handy. EXAMPLE:The test frequency is 100Hz and the level indicated is ­2dB. See Figure 7. When you have completed the 23 measurements, you are ready to analyze the data and make corrective adjustments. The completed Measurement template will look something like the example in Figure 9. Figure 9. Locating a test point It takes a few seconds for the RSLM reading to stabilize, especially at very low frequencies. At the bottom of the bar graph is a green "ON"LED. This LED is illuminated whenever the sound level is below the measuring range of the RSLM. If this occurs during a test, place a dot at the intersection of the test frequency and the bottom frame of the template. Indicating an under-range test When finished, press Skip >>I to advance to the next test. Repeat the process described above for Tracks 5 through 26. CASCADE MODEL TWELVE 8 ENGLISH At this point, you may simply enter the data you just measured into the R. A. B. O. S. [. . . ] Each value shown in the table is represented by detents in the R. A. B. O. S. Simply count the number of detents necessary, indicated by the results of your R. A. B. O. S. Test. Controls Final System Balance Cue Track 51 of the R. A. B. O. S. Test CD. Now play Track 52. Adjust the subwoofer gain control until ­10dB is indicated on the RSLM. [. . . ]