I have Infinity Kappa 6.5 components...they are extremely harsh.
I have done everything I can think of to tone them down but when you do you realize how crappy the midrange on them is.
Though all the equalization I have is the 7 band EQ on my head unit, the amp's adjustment settings for gain/boost and the -6db switch on the crossovers for the tweeters. I wonder if a dedicated equalizer would help but probably not...will switch to Alpine Type-R or MB Quart within a year (will need to listen to them and others first). My fatal mistake was buying them from Crutchfield versus listening to them in store first (or better in car). I had Inifinty Reference coaxials in an old car and thought they were nice so expected the Kappas to be better.