Help, my system seem to have slowly gotten " bright"

All this was in the last few months. It still seems to be decent bass but the highs are just rough. 

Revel f228be a couple of years old. 

I had a hearing test 1 month ago at a ear nose throat doc. I get one every  work anyway. Some upper frequency loss but its been that way for some time.

My system

source is a sony hap-zeis hd player that was around starting in 2014 or 

so. No longer made, 7 years old.

preamps, parasound jc2 and also a backert rhumba extreme 1.3

amps  parasound a-21 and a jc5.

speakers revel f228be and also have some f208 also.

transparent audio speaker cables.

AQ red river xlr, 2 sets. 

I have never conciderd the tweeters could be cooked. 

They have failed 3 times on the f208's. Dont know why to this day.

One time at a semi moderate volume. I was there when it happened. Didnt hear anything odd and then suddenly they sounded dead. Is it possable the beryllium

tweeters dont just work or not work like the others that blew ? Like maybe they can be damaged and still make sound? 

Anyway i will get some sort of tone testing cd or whatever and try it out.

FWIW my car stereo and my headphones at work dont sound like this. 

For reference if anyone’s interested i notice this on molly tuttle and golden highways album city of gold. Very good bluegrass album from someone " flying under the Radar " for lack of a better term. Other stuff too but I have been playing that alot lately.

Its the same sound one hears when someone is public speaking too close to the microphone and you hear that shhhh kinda sound.

I did swap the f208’s back in and they don’t have the shrill like the f228be’s do.

The tweeter has to be damaged, they used to outclass the f208’s 

I really need to sell some stuff but am glad I have it all right now.

I have isolated each speaker and they both some the same. The room hasn’t changed. I am very aware how the placement can have an effect on the sound. I can change the bass sound significantly by just moving them closer to the wall. As I mentioned I have  2 sets of speakers. I have some revel f208’s that are like 7 years old. I later got some revel f228be with is basically the same cabinets with better drivers. I have loved since I got them, they do have a similar sound to the f208’s but just better all around.

So I have just moved the 228,s out and put the 208,s back in and do not hear the excessive brightness present in the others. So I am not sure what to do now.

I did a tone test but couldn’t really notice anything odd.

So, either the tweeters are damaged (but still work ) or the crossover got damaged somehow. Are either of these possable especially the crossover ? What would a marginal crossover sound like ?