Kappa Series Powered Subwoofer – Owner’s Manual
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19
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 Kappa, 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.
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 12. 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. optimization.
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.
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 subwoofers’ output will be
equalized.
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.
The octave is a logarithmic expression. From any point in the spectrum, one
octave above or below that point is always double or half the frequency. Therefore, one
octave above 100 Hz would be 200 Hz. One octave below 100Hz is 50Hz.
In the section that follows, we will discuss the use of the Width Selector.
What Does a
Parametric Equalizer
Do?
Completing
the Measurement
Template
Frequency
Width
Figure 13
Effect of adjustable width
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