Most systems I have seen use several types of speakers from basic ceiling speakers in hallways and toilets to stereo 4 way active speakers on the dance floor.

All of them require some sort of equalization for the type or range of speaker you are outputting to.

If there is a common source used for these different areas,then you need to make them sound tonally the same.

You will never get a ceiling speaker sounding the same as a huge dancefloor system.

What sort of equalization you use is up to you and what you are familiar with.

Garth

I understand what you trying to do now by looking at the particular response of a speaker.

These graphs are a guide to how the speaker responds and can give clues to what you should do to compensate for any bad frequencies.

In your graph it shows a big dip around 6kHz which may need to be boosted in the equalizer you have on the output.

In theory, to get the speaker to sound flat,you would need to apply an equalization that was the inverse of this graph.

But that does not take into account the acoustics of the room you are using this speaker in, and the fact that the speaker can not handle anything below 70 Hz.

Just use it as a guide and let your ears or a spectum anylizer make it sound good.