Ive Always had a resonance issue since living here on ceramic tiles.  Never had it in the small room that was heavily carpeted.   As you all know I have 4 11” subs  2 in a box for each side.  And when I crank that volume up so I can feel the music I get this resonating vibration like something is rattling loose.  Everytime I move those Boxes that the 2X 11” Eton  drivers the resonance disappeared for a little while and then it reappear.  I could never play music loud.   I bought these vibra