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Fine Tuning Your System:
As was said earlier, a vehicle is a less than perfect place to try to reproduce music or any type of audio.
The diagram below is what you hope to see when testing the frequency response from your system. Most systems need LOTS of equalization or other tweaking to achieve this flat frequency response.
The diagram below is more likely what you would see from a system before it was fine tuned. There may be more dips and peaks and they would likely be at different points but this should give you an idea of what you might see.
If you have a graphic equalizer like the 10 band EQ below, you would start with all sliders at their CENTER point where they basically have zero effect on the signal (as in the dia. below).
While watching the levels on the RTA, adjust the EQ slider which affects the frequencies which need to be boosted or cut. If the RTA display looks like this:
You might set the sliders on your EQ like this:
To achieve this:
It is unlikely that you would be able to get a perfectly flat response with a 10 band EQ. It is not necessary to have a perfectly flat response to have a nice sounding system. As a matter of fact, the average person would not think a flat response sounds good.
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