Ntoo qab nthab vaj huam sib luag, acoustic ntoo yog lub hauv ntej qhov, hlais sab nraum qab ntawm perforated cov ntaub ntawv resonance vaj huam sib luag uas muaj ib tug zoo low-frequency acoustic kev ua tau zoo.Nws yog dav siv nyob rau hauv tsev kho kom zoo nkauj thiab coj mus muag qhov rais qhia.Nrog lub vaj huam sib luag no, peb tuaj yeem nyob hauv qhov chaw sib piv uas tuaj yeem ua rau peb muaj kev lom zem ntau dua.Ib chav nrog lub vaj huam sib luag no kuj qhia tau hais tias lub siab saj ntawm tus tswv.