Q Factor is the width of the EQ freq you are boosting or cutting. N = Narrow, W = Wide. If you want to boost a specific frequency choose 2N, if you want a gradual boost of that frequency, choose 2W
As for the "V" shape curve, thats not the best idea. While every car's acoustic response is different, you are best starting flat (no boost or cut) and gradually making changes, you really should not need more then +/-3dB, anymore could cause distortion in that range. Increasing 20kHz 6dB and cutting 1K 6dB in NOT optimum.
Depending on what speakers you have and their response determines what Freq you want to adjust. I have MB Quart comp set, they are known to be a bit harsh, I cut 10K 1.5dB as a result, For mid I cut 1K 1dB and add 1dB @ 100hz as the car needed a bit more mid kick. Also sometimes cutting one frequency enhances another, so adding is not always the best answer either.
When making adjustments choose something musical, Hip-Hop/Rap/Punk are not good sources for tuning as they normally have extreme emphasis on certain freq.
95 Contour SE '01 3L 
