This speaker is low sensitivity; if you really want to play louder I recommend replacing the speaker as in the average room you will want 400-600 watts if you really want to make things move.
If your amplifier seemed like it did the job before, take a look at the woofer surrounds. They could be old enough now that the surround suspension material is perishing; if so the woofers can make quite a lot of distortion when pushed harder, stuff that is high enough in frequency that it could easily cause fatigue.
If your amplifier seemed like it did the job before, take a look at the woofer surrounds. They could be old enough now that the surround suspension material is perishing; if so the woofers can make quite a lot of distortion when pushed harder, stuff that is high enough in frequency that it could easily cause fatigue.