Wearing earplugs, hearing aids and earphones can make your own voice sound booming, but a new design dampens the dinTypical earplugs can make the wearer's own voice sound booming. MirageC/Getty ImagesIf you plug your ears, the voices around you become muffled—while yours becomes annoyingly amplified. “It’s like talking with your head in a barrel. Your own voice sounds booming,” says Kévin Carillo, an engineer who specializes in acoustics and vibration at École de Technologie Supérieure in Montre...