Sound is really bad in the Lenovo t4xx(s) series as well. Had multiple, sound always was bad. The resonating was always there as well, some models better, some

Sound is really bad in the Lenovo t4xx(s) series as well. Had multiple, sound always was bad. The resonating was always there as well, some models better, some worse. Dampening with foam inside the casing sometimes did the trick. But it is not recommended because it might produce heat problems. Oh and yes, foam loves to burn (although there would be enough materials that won't).