Equalization
How does an equalizer work?
Simply put, an equalizer corrects deviations in frequency over a given bandwidth. The slider knobs on the CFQ31M
are each numbered with the center of the frequency "Q" they adjust. By sliding these knobs you can boost or cut a
particular frequency to smooth the response of your system and acquire a more desired sound.
Adjusting Your equalizer
Adjusting your CFQ31M is not an easy task. For this reason, Crossfire recommends the use of a RTA, or
R
eal
T
ime
A
nalyzer. If you are not using a RTA, it will be hard to distinguish the dips and peaks and know how much to
adjust each. Although we highly recommend using a Real Time Analyzer, it is possible to adjust the CFQ31M by
ear to your own taste. However you go about tuning your system, please follow some basic steps.
1. Always start with the frequencies that need to be cut or reduced. Reason: boosting frequencies up 3,6,12 dB is
often accompanied by boosted system noise of equal amount. Cutting frequencies will cut noise.
2. Remember to adjust no more than two frequency bands at one time when tuning by ear. This makes it much
easier to distinguish whether the changes made an improvement or not. Since the CFQ31M is typically mounted in
the trunk its important to listen to the changes in the response after each setting.
3. Always use extreme caution when boosting frequencies. For every 3dB of boost, twice the power is demanded
from the amplifier at that particular frequency. For example, if your amplifier is supplying 25 watts at 0dB at a
particular frequency, then at 3dB of boost it will need to supply 50 watts, and at 6dB of boost it requires 100 watts or
4 times the power. If too much boost is applied, the chances are your amplifier will clip at these frequencies and
possibly damage your speakers and amplifier.
4. Avoid equalizing more than +/- 6dB. If you have this large of a deviation the chances are you have a phase
problem. This could be in part due to the location of the speaker or as simple as a polarity problem with one or more
speakers.
Check the Level Settings
Now that you've had your fun with equalizing, check the output level of the CFQ31M once again. Every time you
made an adjustment the output level was adversely affected. Simply insert the compact disc or cassette tape used to
make your initial settings. Turn the volume to 3/4 maximum setting on the radio while playing the dynamic track
chosen earlier. Adjust the output level accordingly; if distortion is heard or the clip indicator LED is illuminating,
turn the outputs down; if volume is lost you may wish to increase the outputs as long as the peak indicator lights are
not illuminating. Be careful not to overdrive your processors and amplifiers.
Enjoy the music!
