What We Want To Achieve; Flat Response Curve; Best Response Curve - zapco DSP-Z8 IV II Owner's Manual

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 lack-
ing 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.