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

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 am glad it is not a hearing issue.  Now, to diagnose the problem.  Put on something that is a mono recording which exhibits the problem.  Use a balance control, or disconnect one speaker to listem to one channel at a time.  Is the problem the same for both channels?  If there is a difference, try switching the left and right cables to the speakers.  If the problem stays the same, it is the speakers that are at fault.  If it switches channels, it is something upstream of the speakers.  You can move progressivel upstream doing this kind of switching to isolate which component is at fault.  If you have problems in both channels that is about the same, it would be an odd sort of failure, particularly if it is the speakers at fault—it would mean identical damage that is short of taking out the tweeters entirely.

The fact that you’ve had multiple tweeter failures suggest that you are over driving your speakers or that something like your amp is defective and maybe sending a lot of ultrasonic energy to the tweeter and damaging it.

I’m assuming you’re noticing brightness on the recordings you have played before and are familiar with. 
So the question is…did anything change in your room? Furniture updates or moving things around? Removing or changing area rug? Removed window treatments? Any changes in wall decor such as paintings, etc.? Changes in power delivery such as adding or removing power conditioner, changing outlets, running dedicated lines?

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 ?