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). 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. used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. [. . . ] 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. Effect of adjustable width Width is expressed as a percentage of an octave. For example, a width setting of 25% means the equalizer will affect a frequency band of 1/4 of an octave; 1/8 of an octave above and 1/8 of an octave below the center frequency. From any point in the spectrum, one octave above or below that point is always double or half the frequency. Therefore, one octave above 100Hz would be 200Hz. In the section that follows, we will discuss the use of the Width Selector. Completing the Measurement Template Along the bottom of the Measurement Template are three fields where you will enter the equalizer settings needed to complete system optimization. These instructions are based on the example in Figure 11. Use this tutorial to become familiar with the process. Strategies for several other test results will be presented later. After you have completed these three entry fields, you will be ready to perform the adjustments, completing R. A. B. O. S. Frequency The frequency of the R. A. B. O. S. equalizer may be adjusted to any one of nineteen frequencies from 20Hz to 80Hz. This defines where you are going to apply equalization. 9 Cascade Model Twelve Using the Width Selector Read the following instructions carefully. The example presented may not look like the graph you just created. Focus on the concepts and techniques presented. Specific cases will be discussed later. Figure 13. Placement of the Bandwidth Selector Figure 12. Width Selector You will use the Measurement Template just completed and the Width Selector to determine the correct width setting. The Width Selector graphically depicts a single resonant peak. The peak looks similar to a slice of a pie. [. . . ] Increase the system volume until the RSLM indicates ­10dB. Adjust the subwoofer gain control until ­10dB is indicated on the RSLM. Of course, you may fine-tune the subwoofer gain control to your listening preference. It is recommended that you remove the battery from the RSLM. [. . . ]