i own the rockport altair's and i can tell you without hesitation or any doubt at all that there are no box vibrations. nor do they bottom out. in fact i am still looking for the bottom. i had considered the yg pro but could not get past the look, at $100000 + list price they should be better looking, not just metal pyramids. i also considered the upgraded alexandra 11's and focal grande(although i have not seen these in their new form). i chose the altair for the whole package sound, quality of built, looks(wife factor) warranty(5yr) and price. they are fantastic speaker as they should be.