User manual INFINITY MODULUS II

[. . . ] MODULUS II HOME THEATER SYSTEM ® Owner's Guide IMPORTANT SAFETY PRECAUTIONS Read First! CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: To reduce the risk of electric shock, do not remove cover (or back). Refer servicing to qualified service personnel. CAUTION: To prevent electric shock, do not use this (polarized) plug with an extension cord, receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure. The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. 13. [. . . ] The Modulus II subwoofer should be shipped with the three R. A. B. O. S. controls, TM, £ and ¢, 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 ª should be set to the mid position (5). 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 woofers 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. Strong buzzes not only sound bad, they can cause measurement errors. 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. FIGURE 16 MODULUS II HOME THEATER SYSTEM 11 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 16 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. As Track 4 plays, observe the level indicated on the RSLM. EXAMPLE:The test frequency is 100Hz and the level indicated is ­2dB. Find the intersection of 100Hz (X-axis) and ­2dB (Y-axis). Locating a test point When finished, press Skip >> to advance to the next test. Repeat l the process described above for Tracks 5 through 26. 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 19. Completed R. A. B. O. S. template FIGURE 19 Now connect the dots as shown in Figure 20. This will make interpretation of the data much easier. FIGURE 17 Test example with dots connected It takes a few seconds for the RSLM reading to stabilize, especially at very low frequencies. Give each test adequate time for the meter to stabilize. [. . . ] It is recommended that you perform a second measurement to confirm that the settings are correct. If you are going to retest the system after EQ adjustments, repeat the "Setting the Subwoofer Test Level" section on p. Retesting the system will go much faster if you use Tracks 27­50. These tracks contain all the same test tones you just used. However, each tone plays for only a few seconds and there is no frequency announcement. [. . . ]