User manual INFINITY CASCADE MODELE TWELVE

[. . . ] Compact Powered Subwoofer MODEL TWELVE Owner's Guide (120V) 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). 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. used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. Unplug this apparatus during lightning storms or when unused for long periods of time. [. . . ] 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 finished, press Skip >>I to advance to the next test. 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. See Figure 8. Figure 10. Test example with dots connected 2 Figure 8. Indicating an under-range test Cascade Model Twelve 8 At this point, you may simply enter the data you just measured into the R. A. B. O. S. calculator, found on the Infinity Web site at www. infinitysystems. com. Skip to page 14 and adjust these controls as described, and finish the R. A. B. O. S. settings, simply continue following the instructions from this point. STOP Width The frequency range of the R. A. B. O. S. equalizer may be set from 5% to 50% of an octave in 21 steps. This setting defines how much of the Cascade Model Twelve's output will be equalized. What Does a Parametric Equalizer Do? The R. A. B. O. S. system uses one band of parametric equalization for response correction. Parametric equalizers are the most versatile class of filters. The effect an equalizer will have on the signal is dependent on three parameters. Frequency: The equalizer will have maximum effect at one frequency, usually described as the center frequency. Level: This refers to the amount of cut (in dBs) the equalizer is set for. Bandwidth: Defines the range of frequencies over which the equalizer will have an effect. On the Cascade Model Twelve, this adjustment is abbreviated as "Width. " Only parametric equalizers allow independent adjustment of all three parameters. These will be explained more fully in the sections that follow. Figure 11. [. . . ] Ideal response, no EQ needed Cascade Model Twelve 14 If using more than one subwoofer, always adjust both subwoofers together. 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. [. . . ]