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What We Want to Achieve
You will use the EQ graph and the Function bar above for making the EQ adjustments.
Below we lay out the EQ tuning functions. Of course, there is no way to know what the
response in any particular car will be. However, we can say what response we want to
achieve. The first step is to play pink noise through the system and read the output level
of each 1/3 octave band on the RTA. For tuning, you will want to have your system playing
a slightly loud volume. With pink noise playing you should turn the system up so the
response curve centers around 90dB. Your RTA will tell you the volume level in dB. Chart
them each for dB level so you know how much you need to add or subtract much to
make to bring them all close to the shape you want. Note that as much as possible you
want to subtract with the EQ and not add, as adding gain with the equalizer can cause
more stress on your amps and can add noise to the system. Then you need to decide
what curve you want to have. Here are a few samples. Remember that these curves are
what we want to see on the RTA. Your EQ graph will look far different.
Flat Response Curve
Many people try this first. a. It is very difficult b. It will almost always sound bad. It will be
lacking in bass and sound harsh on the high end. How the ear works at different frequencies
and volume levels affects what response will sound best.
Best Response Curve
The best curve will be higher in the bass frequencies and will have only small changes
from each 1/3 octave band to the next, then it will roll of at the higher frequencies.
A Good Response Curve
This is actually a good Frequency curve. There are some small out-of-line variations (Blue
circles) but they are small and you won't hear them. There is one big variation (green circle)
which is the single low point, or null point. This can be caused by a phase issue (usually
around a crossover). You should not try to equalize out a null point because, a) your ear is
not very sensitive to drop-outs so you likely won't notice it at all, and b) trying to equalize
it will only waste power and will likely distort the frequencies on either side of it. While it
is best not to try to equalize a null point, you will want to check your crossovers. If you
have a null point directly at the crossover between 2 drivers you may have a crossover
spaced too far apart. But if the crossovers are OK then leave as is.