Notch filter > speakers hurt my ears?

I replaced my front mid speakers with a set of Silver Flute 6.5"s from Madisound & I replaced my front tweeters with a set of Dayton Silkies in my car. I'm powering them with an Alpine MRV F540, which has built in crossovers. Okay, this one guy, Zaph, measures a lot of speakers & he says to keep the mids under 1.8hz so I low passed them @ 1.8khz on my amp & I also high passed them at 55hz to keep them from playing low-er notes. Oh and my amps built in filters are all 12db/octave. I high passed my tweeters at 2.5khz. They are large format & will do 2khz 2nd order believe it or not. I left that gap so I don't end up with a bump where the mid and tweeter meet.

Anyways, I only have it at like 80-90db SPL levels (we can talk over this) and certain frequencies in the vocal range hurt my ears. Like higher noted piano keys hurt.

Looking at the response graph of either speaker, I don't see any huge spikes or anything.

How can I tackle this? What's the cheapest way to measure the freq response (like microphone and software or can I just use iphone with app?) & how do i go about the notch filter?

I studY circuits

I don't understand -a single series inductor will low pass a load, say at uh, 100hz & then it will be 6db quieter per octave below that, so at 50 it'll be minus 6db, at 25 itll be -12, etc. Same with capacitor cept other way. Now what about a notch filter? Does it go minus 6 db in both directions? Let's say I have a hump at 500hz. How do I attenuate in both directions?

Your problem with your ears has to do with your physical limitations, like tinnitus, and playing complex filtering games with your confined sound system probably isn't going to help.