Infinity TWELVE Owner's Manual page 15

Example 2. Two Response Peaks
Figure 16. Two response peaks
Characterized by two response peaks, approximately equal in
amplitude and width.This requires that you make a choice
between the two peaks. In situations like this, the higher
frequency peak will always be more audible and objectionable.
Response peaks below 45Hz, unless extreme, can actually be
beneficial toward achieving visceral impact. Perform
corrections on the upper frequency peak.
Apply the Width Selector as described above.Align the
centerline of the Selector over the center of the higher
frequency peak. Now adjust the Selector until you have achieved
the "best fit."The slider now points to the correct width setting.
In this example, this is at 52Hz.The best-fit width is 28%. Fill in
the Width and Frequency fields provided on the template.
Determine the appropriate level using the technique described
earlier.This calculation will indicate a –8dB setting. However,
this peak does not reach the 0dB level as the lower peak does.
Therefore, a –8dB setting would be excessive.The 52Hz peak
stops at –2dB. Subtracting 2 from 8 yields the correct setting,
–6dB. Enter –6 in the Level field.
Skip to the "Adjusting the R.A.B.O.S. Equalizer"section on
page 14.
Example 3. Peak Adjacent to a Dip
Figure 17. Dip above or below peak
Response dips can occur at any frequency, sometimes
immediately adjacent to the peak you want to correct.Two
examples are shown, one immediately above and one
immediately below the peak. Deep response dips such as these
are caused by destructive wave interference. Destructive
interference dips occur only in one spot within the room. It is
not uncommon to completely eliminate the effect by moving the
RSLM to a different location. Note that this does not eliminate
the dips.We have simply moved away from them. Sometimes only
a few inches are required. Do not attempt to correct this
condition with equalization. If you encounter dips like this, take
the following steps:
CASCADE MODEL TWELVE
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